Got basic webpage working. Need to make base page, static folders
This commit is contained in:
Karthik Pullela
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from .fields import AddField, AlterField, RemoveField, RenameField
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from .models import (
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AddIndex, AlterIndexTogether, AlterModelManagers, AlterModelOptions,
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AlterModelTable, AlterOrderWithRespectTo, AlterUniqueTogether, CreateModel,
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DeleteModel, RemoveIndex, RenameModel,
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)
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from .special import RunPython, RunSQL, SeparateDatabaseAndState
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__all__ = [
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'CreateModel', 'DeleteModel', 'AlterModelTable', 'AlterUniqueTogether',
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'RenameModel', 'AlterIndexTogether', 'AlterModelOptions', 'AddIndex',
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'RemoveIndex', 'AddField', 'RemoveField', 'AlterField', 'RenameField',
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'SeparateDatabaseAndState', 'RunSQL', 'RunPython',
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'AlterOrderWithRespectTo', 'AlterModelManagers',
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]
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from django.db import router
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class Operation:
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"""
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Base class for migration operations.
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It's responsible for both mutating the in-memory model state
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(see db/migrations/state.py) to represent what it performs, as well
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as actually performing it against a live database.
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Note that some operations won't modify memory state at all (e.g. data
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copying operations), and some will need their modifications to be
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optionally specified by the user (e.g. custom Python code snippets)
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Due to the way this class deals with deconstruction, it should be
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considered immutable.
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"""
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# If this migration can be run in reverse.
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# Some operations are impossible to reverse, like deleting data.
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reversible = True
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# Can this migration be represented as SQL? (things like RunPython cannot)
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reduces_to_sql = True
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# Should this operation be forced as atomic even on backends with no
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# DDL transaction support (i.e., does it have no DDL, like RunPython)
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atomic = False
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# Should this operation be considered safe to elide and optimize across?
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elidable = False
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serialization_expand_args = []
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def __new__(cls, *args, **kwargs):
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# We capture the arguments to make returning them trivial
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self = object.__new__(cls)
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self._constructor_args = (args, kwargs)
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return self
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def deconstruct(self):
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"""
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Return a 3-tuple of class import path (or just name if it lives
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under django.db.migrations), positional arguments, and keyword
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arguments.
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"""
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return (
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self.__class__.__name__,
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self._constructor_args[0],
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self._constructor_args[1],
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)
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def state_forwards(self, app_label, state):
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"""
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Take the state from the previous migration, and mutate it
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so that it matches what this migration would perform.
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"""
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raise NotImplementedError('subclasses of Operation must provide a state_forwards() method')
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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"""
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Perform the mutation on the database schema in the normal
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(forwards) direction.
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"""
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raise NotImplementedError('subclasses of Operation must provide a database_forwards() method')
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def database_backwards(self, app_label, schema_editor, from_state, to_state):
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"""
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Perform the mutation on the database schema in the reverse
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direction - e.g. if this were CreateModel, it would in fact
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drop the model's table.
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"""
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raise NotImplementedError('subclasses of Operation must provide a database_backwards() method')
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def describe(self):
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"""
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Output a brief summary of what the action does.
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"""
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return "%s: %s" % (self.__class__.__name__, self._constructor_args)
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def references_model(self, name, app_label=None):
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"""
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Return True if there is a chance this operation references the given
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model name (as a string), with an optional app label for accuracy.
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Used for optimization. If in doubt, return True;
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returning a false positive will merely make the optimizer a little
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less efficient, while returning a false negative may result in an
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unusable optimized migration.
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"""
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return True
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def references_field(self, model_name, name, app_label=None):
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"""
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Return True if there is a chance this operation references the given
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field name, with an optional app label for accuracy.
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Used for optimization. If in doubt, return True.
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"""
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return self.references_model(model_name, app_label)
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def allow_migrate_model(self, connection_alias, model):
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"""
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Return wether or not a model may be migrated.
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This is a thin wrapper around router.allow_migrate_model() that
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preemptively rejects any proxy, swapped out, or unmanaged model.
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"""
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if not model._meta.can_migrate(connection_alias):
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return False
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return router.allow_migrate_model(connection_alias, model)
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def reduce(self, operation, in_between, app_label=None):
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"""
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Return either a list of operations the actual operation should be
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replaced with or a boolean that indicates whether or not the specified
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operation can be optimized across.
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"""
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if self.elidable:
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return [operation]
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elif operation.elidable:
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return [self]
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return False
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def __repr__(self):
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return "<%s %s%s>" % (
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self.__class__.__name__,
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", ".join(map(repr, self._constructor_args[0])),
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",".join(" %s=%r" % x for x in self._constructor_args[1].items()),
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)
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@@ -0,0 +1,342 @@
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from django.core.exceptions import FieldDoesNotExist
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from django.db.models.fields import NOT_PROVIDED
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from django.utils.functional import cached_property
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from .base import Operation
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from .utils import is_referenced_by_foreign_key
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class FieldOperation(Operation):
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def __init__(self, model_name, name):
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self.model_name = model_name
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self.name = name
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@cached_property
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def model_name_lower(self):
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return self.model_name.lower()
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@cached_property
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def name_lower(self):
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return self.name.lower()
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def is_same_model_operation(self, operation):
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return self.model_name_lower == operation.model_name_lower
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def is_same_field_operation(self, operation):
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return self.is_same_model_operation(operation) and self.name_lower == operation.name_lower
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def references_model(self, name, app_label=None):
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return name.lower() == self.model_name_lower
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def references_field(self, model_name, name, app_label=None):
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return self.references_model(model_name) and name.lower() == self.name_lower
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def reduce(self, operation, in_between, app_label=None):
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return (
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super().reduce(operation, in_between, app_label=app_label) or
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not operation.references_field(self.model_name, self.name, app_label)
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)
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class AddField(FieldOperation):
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"""Add a field to a model."""
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def __init__(self, model_name, name, field, preserve_default=True):
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self.field = field
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self.preserve_default = preserve_default
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super().__init__(model_name, name)
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def deconstruct(self):
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kwargs = {
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'model_name': self.model_name,
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'name': self.name,
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'field': self.field,
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}
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if self.preserve_default is not True:
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kwargs['preserve_default'] = self.preserve_default
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return (
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self.__class__.__name__,
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[],
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kwargs
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)
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def state_forwards(self, app_label, state):
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# If preserve default is off, don't use the default for future state
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if not self.preserve_default:
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field = self.field.clone()
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field.default = NOT_PROVIDED
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else:
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field = self.field
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state.models[app_label, self.model_name_lower].fields.append((self.name, field))
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# Delay rendering of relationships if it's not a relational field
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delay = not field.is_relation
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state.reload_model(app_label, self.model_name_lower, delay=delay)
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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to_model = to_state.apps.get_model(app_label, self.model_name)
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if self.allow_migrate_model(schema_editor.connection.alias, to_model):
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from_model = from_state.apps.get_model(app_label, self.model_name)
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field = to_model._meta.get_field(self.name)
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if not self.preserve_default:
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field.default = self.field.default
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schema_editor.add_field(
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from_model,
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field,
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)
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if not self.preserve_default:
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field.default = NOT_PROVIDED
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def database_backwards(self, app_label, schema_editor, from_state, to_state):
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from_model = from_state.apps.get_model(app_label, self.model_name)
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if self.allow_migrate_model(schema_editor.connection.alias, from_model):
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schema_editor.remove_field(from_model, from_model._meta.get_field(self.name))
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def describe(self):
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return "Add field %s to %s" % (self.name, self.model_name)
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def reduce(self, operation, in_between, app_label=None):
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if isinstance(operation, FieldOperation) and self.is_same_field_operation(operation):
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if isinstance(operation, AlterField):
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return [
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AddField(
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model_name=self.model_name,
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name=operation.name,
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field=operation.field,
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),
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]
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elif isinstance(operation, RemoveField):
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return []
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elif isinstance(operation, RenameField):
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return [
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AddField(
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model_name=self.model_name,
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name=operation.new_name,
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field=self.field,
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),
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]
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return super().reduce(operation, in_between, app_label=app_label)
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class RemoveField(FieldOperation):
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"""Remove a field from a model."""
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def deconstruct(self):
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kwargs = {
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'model_name': self.model_name,
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'name': self.name,
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}
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return (
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self.__class__.__name__,
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[],
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kwargs
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)
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def state_forwards(self, app_label, state):
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new_fields = []
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old_field = None
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for name, instance in state.models[app_label, self.model_name_lower].fields:
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if name != self.name:
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new_fields.append((name, instance))
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else:
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old_field = instance
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state.models[app_label, self.model_name_lower].fields = new_fields
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# Delay rendering of relationships if it's not a relational field
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delay = not old_field.is_relation
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state.reload_model(app_label, self.model_name_lower, delay=delay)
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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from_model = from_state.apps.get_model(app_label, self.model_name)
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if self.allow_migrate_model(schema_editor.connection.alias, from_model):
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schema_editor.remove_field(from_model, from_model._meta.get_field(self.name))
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def database_backwards(self, app_label, schema_editor, from_state, to_state):
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to_model = to_state.apps.get_model(app_label, self.model_name)
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if self.allow_migrate_model(schema_editor.connection.alias, to_model):
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from_model = from_state.apps.get_model(app_label, self.model_name)
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schema_editor.add_field(from_model, to_model._meta.get_field(self.name))
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def describe(self):
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return "Remove field %s from %s" % (self.name, self.model_name)
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class AlterField(FieldOperation):
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"""
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Alter a field's database column (e.g. null, max_length) to the provided
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new field.
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"""
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def __init__(self, model_name, name, field, preserve_default=True):
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self.field = field
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self.preserve_default = preserve_default
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super().__init__(model_name, name)
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def deconstruct(self):
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kwargs = {
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'model_name': self.model_name,
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'name': self.name,
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'field': self.field,
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}
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if self.preserve_default is not True:
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kwargs['preserve_default'] = self.preserve_default
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return (
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self.__class__.__name__,
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[],
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kwargs
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)
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def state_forwards(self, app_label, state):
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if not self.preserve_default:
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field = self.field.clone()
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field.default = NOT_PROVIDED
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else:
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field = self.field
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state.models[app_label, self.model_name_lower].fields = [
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(n, field if n == self.name else f)
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for n, f in
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state.models[app_label, self.model_name_lower].fields
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]
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# TODO: investigate if old relational fields must be reloaded or if it's
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# sufficient if the new field is (#27737).
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# Delay rendering of relationships if it's not a relational field and
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# not referenced by a foreign key.
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delay = (
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not field.is_relation and
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not is_referenced_by_foreign_key(state, self.model_name_lower, self.field, self.name)
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)
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state.reload_model(app_label, self.model_name_lower, delay=delay)
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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to_model = to_state.apps.get_model(app_label, self.model_name)
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if self.allow_migrate_model(schema_editor.connection.alias, to_model):
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from_model = from_state.apps.get_model(app_label, self.model_name)
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from_field = from_model._meta.get_field(self.name)
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to_field = to_model._meta.get_field(self.name)
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if not self.preserve_default:
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to_field.default = self.field.default
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schema_editor.alter_field(from_model, from_field, to_field)
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if not self.preserve_default:
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to_field.default = NOT_PROVIDED
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def database_backwards(self, app_label, schema_editor, from_state, to_state):
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self.database_forwards(app_label, schema_editor, from_state, to_state)
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def describe(self):
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return "Alter field %s on %s" % (self.name, self.model_name)
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def reduce(self, operation, in_between, app_label=None):
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if isinstance(operation, RemoveField) and self.is_same_field_operation(operation):
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return [operation]
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elif isinstance(operation, RenameField) and self.is_same_field_operation(operation):
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return [
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operation,
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AlterField(
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model_name=self.model_name,
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name=operation.new_name,
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field=self.field,
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),
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]
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return super().reduce(operation, in_between, app_label=app_label)
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class RenameField(FieldOperation):
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"""Rename a field on the model. Might affect db_column too."""
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def __init__(self, model_name, old_name, new_name):
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self.old_name = old_name
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self.new_name = new_name
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super().__init__(model_name, old_name)
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@cached_property
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def old_name_lower(self):
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return self.old_name.lower()
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@cached_property
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def new_name_lower(self):
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return self.new_name.lower()
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def deconstruct(self):
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kwargs = {
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'model_name': self.model_name,
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'old_name': self.old_name,
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'new_name': self.new_name,
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}
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return (
|
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self.__class__.__name__,
|
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[],
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kwargs
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)
|
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def state_forwards(self, app_label, state):
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model_state = state.models[app_label, self.model_name_lower]
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# Rename the field
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fields = model_state.fields
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for index, (name, field) in enumerate(fields):
|
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if name == self.old_name:
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fields[index] = (self.new_name, field)
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# Delay rendering of relationships if it's not a relational
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# field and not referenced by a foreign key.
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delay = (
|
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not field.is_relation and
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not is_referenced_by_foreign_key(state, self.model_name_lower, field, self.name)
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)
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break
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else:
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raise FieldDoesNotExist(
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"%s.%s has no field named '%s'" % (app_label, self.model_name, self.old_name)
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)
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# Fix index/unique_together to refer to the new field
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options = model_state.options
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for option in ('index_together', 'unique_together'):
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if option in options:
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options[option] = [
|
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[self.new_name if n == self.old_name else n for n in together]
|
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for together in options[option]
|
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]
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state.reload_model(app_label, self.model_name_lower, delay=delay)
|
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|
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
||||
to_model = to_state.apps.get_model(app_label, self.model_name)
|
||||
if self.allow_migrate_model(schema_editor.connection.alias, to_model):
|
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from_model = from_state.apps.get_model(app_label, self.model_name)
|
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schema_editor.alter_field(
|
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from_model,
|
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from_model._meta.get_field(self.old_name),
|
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to_model._meta.get_field(self.new_name),
|
||||
)
|
||||
|
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def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
||||
to_model = to_state.apps.get_model(app_label, self.model_name)
|
||||
if self.allow_migrate_model(schema_editor.connection.alias, to_model):
|
||||
from_model = from_state.apps.get_model(app_label, self.model_name)
|
||||
schema_editor.alter_field(
|
||||
from_model,
|
||||
from_model._meta.get_field(self.new_name),
|
||||
to_model._meta.get_field(self.old_name),
|
||||
)
|
||||
|
||||
def describe(self):
|
||||
return "Rename field %s on %s to %s" % (self.old_name, self.model_name, self.new_name)
|
||||
|
||||
def references_field(self, model_name, name, app_label=None):
|
||||
return self.references_model(model_name) and (
|
||||
name.lower() == self.old_name_lower or
|
||||
name.lower() == self.new_name_lower
|
||||
)
|
||||
|
||||
def reduce(self, operation, in_between, app_label=None):
|
||||
if (isinstance(operation, RenameField) and
|
||||
self.is_same_model_operation(operation) and
|
||||
self.new_name_lower == operation.old_name_lower):
|
||||
return [
|
||||
RenameField(
|
||||
self.model_name,
|
||||
self.old_name,
|
||||
operation.new_name,
|
||||
),
|
||||
]
|
||||
# Skip `FieldOperation.reduce` as we want to run `references_field`
|
||||
# against self.new_name.
|
||||
return (
|
||||
super(FieldOperation, self).reduce(operation, in_between, app_label=app_label) or
|
||||
not operation.references_field(self.model_name, self.new_name, app_label)
|
||||
)
|
||||
@@ -0,0 +1,836 @@
|
||||
from django.db import models
|
||||
from django.db.migrations.operations.base import Operation
|
||||
from django.db.migrations.state import ModelState
|
||||
from django.db.models.fields.related import RECURSIVE_RELATIONSHIP_CONSTANT
|
||||
from django.db.models.options import normalize_together
|
||||
from django.utils.functional import cached_property
|
||||
|
||||
from .fields import (
|
||||
AddField, AlterField, FieldOperation, RemoveField, RenameField,
|
||||
)
|
||||
|
||||
|
||||
def _check_for_duplicates(arg_name, objs):
|
||||
used_vals = set()
|
||||
for val in objs:
|
||||
if val in used_vals:
|
||||
raise ValueError(
|
||||
"Found duplicate value %s in CreateModel %s argument." % (val, arg_name)
|
||||
)
|
||||
used_vals.add(val)
|
||||
|
||||
|
||||
class ModelOperation(Operation):
|
||||
def __init__(self, name):
|
||||
self.name = name
|
||||
|
||||
@cached_property
|
||||
def name_lower(self):
|
||||
return self.name.lower()
|
||||
|
||||
def references_model(self, name, app_label=None):
|
||||
return name.lower() == self.name_lower
|
||||
|
||||
def reduce(self, operation, in_between, app_label=None):
|
||||
return (
|
||||
super().reduce(operation, in_between, app_label=app_label) or
|
||||
not operation.references_model(self.name, app_label)
|
||||
)
|
||||
|
||||
|
||||
class CreateModel(ModelOperation):
|
||||
"""Create a model's table."""
|
||||
|
||||
serialization_expand_args = ['fields', 'options', 'managers']
|
||||
|
||||
def __init__(self, name, fields, options=None, bases=None, managers=None):
|
||||
self.fields = fields
|
||||
self.options = options or {}
|
||||
self.bases = bases or (models.Model,)
|
||||
self.managers = managers or []
|
||||
super().__init__(name)
|
||||
# Sanity-check that there are no duplicated field names, bases, or
|
||||
# manager names
|
||||
_check_for_duplicates('fields', (name for name, _ in self.fields))
|
||||
_check_for_duplicates('bases', (
|
||||
base._meta.label_lower if hasattr(base, '_meta') else
|
||||
base.lower() if isinstance(base, str) else base
|
||||
for base in self.bases
|
||||
))
|
||||
_check_for_duplicates('managers', (name for name, _ in self.managers))
|
||||
|
||||
def deconstruct(self):
|
||||
kwargs = {
|
||||
'name': self.name,
|
||||
'fields': self.fields,
|
||||
}
|
||||
if self.options:
|
||||
kwargs['options'] = self.options
|
||||
if self.bases and self.bases != (models.Model,):
|
||||
kwargs['bases'] = self.bases
|
||||
if self.managers and self.managers != [('objects', models.Manager())]:
|
||||
kwargs['managers'] = self.managers
|
||||
return (
|
||||
self.__class__.__qualname__,
|
||||
[],
|
||||
kwargs
|
||||
)
|
||||
|
||||
def state_forwards(self, app_label, state):
|
||||
state.add_model(ModelState(
|
||||
app_label,
|
||||
self.name,
|
||||
list(self.fields),
|
||||
dict(self.options),
|
||||
tuple(self.bases),
|
||||
list(self.managers),
|
||||
))
|
||||
|
||||
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
||||
model = to_state.apps.get_model(app_label, self.name)
|
||||
if self.allow_migrate_model(schema_editor.connection.alias, model):
|
||||
schema_editor.create_model(model)
|
||||
|
||||
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
||||
model = from_state.apps.get_model(app_label, self.name)
|
||||
if self.allow_migrate_model(schema_editor.connection.alias, model):
|
||||
schema_editor.delete_model(model)
|
||||
|
||||
def describe(self):
|
||||
return "Create %smodel %s" % ("proxy " if self.options.get("proxy", False) else "", self.name)
|
||||
|
||||
def references_model(self, name, app_label=None):
|
||||
name_lower = name.lower()
|
||||
if name_lower == self.name_lower:
|
||||
return True
|
||||
|
||||
# Check we didn't inherit from the model
|
||||
models_to_check = [
|
||||
base for base in self.bases
|
||||
if base is not models.Model and isinstance(base, (models.base.ModelBase, str))
|
||||
]
|
||||
# Check we have no FKs/M2Ms with it
|
||||
for fname, field in self.fields:
|
||||
if field.remote_field:
|
||||
models_to_check.append(field.remote_field.model)
|
||||
# Now go over all the models and check against them
|
||||
for model in models_to_check:
|
||||
model_app_label, model_name = self.model_to_key(model)
|
||||
if model_name.lower() == name_lower:
|
||||
if app_label is None or not model_app_label or model_app_label == app_label:
|
||||
return True
|
||||
return False
|
||||
|
||||
def model_to_key(self, model):
|
||||
"""
|
||||
Take either a model class or an "app_label.ModelName" string
|
||||
and return (app_label, object_name).
|
||||
"""
|
||||
if isinstance(model, str):
|
||||
return model.split(".", 1)
|
||||
else:
|
||||
return model._meta.app_label, model._meta.object_name
|
||||
|
||||
def reduce(self, operation, in_between, app_label=None):
|
||||
if (isinstance(operation, DeleteModel) and
|
||||
self.name_lower == operation.name_lower and
|
||||
not self.options.get("proxy", False)):
|
||||
return []
|
||||
elif isinstance(operation, RenameModel) and self.name_lower == operation.old_name_lower:
|
||||
return [
|
||||
CreateModel(
|
||||
operation.new_name,
|
||||
fields=self.fields,
|
||||
options=self.options,
|
||||
bases=self.bases,
|
||||
managers=self.managers,
|
||||
),
|
||||
]
|
||||
elif isinstance(operation, AlterModelOptions) and self.name_lower == operation.name_lower:
|
||||
new_options = self.options.copy()
|
||||
new_options.update(operation.options)
|
||||
return [
|
||||
CreateModel(
|
||||
self.name,
|
||||
fields=self.fields,
|
||||
options=new_options,
|
||||
bases=self.bases,
|
||||
managers=self.managers,
|
||||
),
|
||||
]
|
||||
elif isinstance(operation, FieldOperation) and self.name_lower == operation.model_name_lower:
|
||||
if isinstance(operation, AddField):
|
||||
# Don't allow optimizations of FKs through models they reference
|
||||
if hasattr(operation.field, "remote_field") and operation.field.remote_field:
|
||||
for between in in_between:
|
||||
# Check that it doesn't point to the model
|
||||
app_label, object_name = self.model_to_key(operation.field.remote_field.model)
|
||||
if between.references_model(object_name, app_label):
|
||||
return False
|
||||
# Check that it's not through the model
|
||||
if getattr(operation.field.remote_field, "through", None):
|
||||
app_label, object_name = self.model_to_key(operation.field.remote_field.through)
|
||||
if between.references_model(object_name, app_label):
|
||||
return False
|
||||
return [
|
||||
CreateModel(
|
||||
self.name,
|
||||
fields=self.fields + [(operation.name, operation.field)],
|
||||
options=self.options,
|
||||
bases=self.bases,
|
||||
managers=self.managers,
|
||||
),
|
||||
]
|
||||
elif isinstance(operation, AlterField):
|
||||
return [
|
||||
CreateModel(
|
||||
self.name,
|
||||
fields=[
|
||||
(n, operation.field if n == operation.name else v)
|
||||
for n, v in self.fields
|
||||
],
|
||||
options=self.options,
|
||||
bases=self.bases,
|
||||
managers=self.managers,
|
||||
),
|
||||
]
|
||||
elif isinstance(operation, RemoveField):
|
||||
return [
|
||||
CreateModel(
|
||||
self.name,
|
||||
fields=[
|
||||
(n, v)
|
||||
for n, v in self.fields
|
||||
if n.lower() != operation.name_lower
|
||||
],
|
||||
options=self.options,
|
||||
bases=self.bases,
|
||||
managers=self.managers,
|
||||
),
|
||||
]
|
||||
elif isinstance(operation, RenameField):
|
||||
return [
|
||||
CreateModel(
|
||||
self.name,
|
||||
fields=[
|
||||
(operation.new_name if n == operation.old_name else n, v)
|
||||
for n, v in self.fields
|
||||
],
|
||||
options=self.options,
|
||||
bases=self.bases,
|
||||
managers=self.managers,
|
||||
),
|
||||
]
|
||||
return super().reduce(operation, in_between, app_label=app_label)
|
||||
|
||||
|
||||
class DeleteModel(ModelOperation):
|
||||
"""Drop a model's table."""
|
||||
|
||||
def deconstruct(self):
|
||||
kwargs = {
|
||||
'name': self.name,
|
||||
}
|
||||
return (
|
||||
self.__class__.__qualname__,
|
||||
[],
|
||||
kwargs
|
||||
)
|
||||
|
||||
def state_forwards(self, app_label, state):
|
||||
state.remove_model(app_label, self.name_lower)
|
||||
|
||||
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
||||
model = from_state.apps.get_model(app_label, self.name)
|
||||
if self.allow_migrate_model(schema_editor.connection.alias, model):
|
||||
schema_editor.delete_model(model)
|
||||
|
||||
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
||||
model = to_state.apps.get_model(app_label, self.name)
|
||||
if self.allow_migrate_model(schema_editor.connection.alias, model):
|
||||
schema_editor.create_model(model)
|
||||
|
||||
def describe(self):
|
||||
return "Delete model %s" % (self.name, )
|
||||
|
||||
|
||||
class RenameModel(ModelOperation):
|
||||
"""Rename a model."""
|
||||
|
||||
def __init__(self, old_name, new_name):
|
||||
self.old_name = old_name
|
||||
self.new_name = new_name
|
||||
super().__init__(old_name)
|
||||
|
||||
@cached_property
|
||||
def old_name_lower(self):
|
||||
return self.old_name.lower()
|
||||
|
||||
@cached_property
|
||||
def new_name_lower(self):
|
||||
return self.new_name.lower()
|
||||
|
||||
def deconstruct(self):
|
||||
kwargs = {
|
||||
'old_name': self.old_name,
|
||||
'new_name': self.new_name,
|
||||
}
|
||||
return (
|
||||
self.__class__.__qualname__,
|
||||
[],
|
||||
kwargs
|
||||
)
|
||||
|
||||
def _get_model_tuple(self, remote_model, app_label, model_name):
|
||||
if remote_model == RECURSIVE_RELATIONSHIP_CONSTANT:
|
||||
return app_label, model_name.lower()
|
||||
elif '.' in remote_model:
|
||||
return tuple(remote_model.lower().split('.'))
|
||||
else:
|
||||
return app_label, remote_model.lower()
|
||||
|
||||
def state_forwards(self, app_label, state):
|
||||
# Add a new model.
|
||||
renamed_model = state.models[app_label, self.old_name_lower].clone()
|
||||
renamed_model.name = self.new_name
|
||||
state.models[app_label, self.new_name_lower] = renamed_model
|
||||
# Repoint all fields pointing to the old model to the new one.
|
||||
old_model_tuple = app_label, self.old_name_lower
|
||||
new_remote_model = '%s.%s' % (app_label, self.new_name)
|
||||
to_reload = []
|
||||
for (model_app_label, model_name), model_state in state.models.items():
|
||||
model_changed = False
|
||||
for index, (name, field) in enumerate(model_state.fields):
|
||||
changed_field = None
|
||||
remote_field = field.remote_field
|
||||
if remote_field:
|
||||
remote_model_tuple = self._get_model_tuple(
|
||||
remote_field.model, model_app_label, model_name
|
||||
)
|
||||
if remote_model_tuple == old_model_tuple:
|
||||
changed_field = field.clone()
|
||||
changed_field.remote_field.model = new_remote_model
|
||||
through_model = getattr(remote_field, 'through', None)
|
||||
if through_model:
|
||||
through_model_tuple = self._get_model_tuple(
|
||||
through_model, model_app_label, model_name
|
||||
)
|
||||
if through_model_tuple == old_model_tuple:
|
||||
if changed_field is None:
|
||||
changed_field = field.clone()
|
||||
changed_field.remote_field.through = new_remote_model
|
||||
if changed_field:
|
||||
model_state.fields[index] = name, changed_field
|
||||
model_changed = True
|
||||
if model_changed:
|
||||
to_reload.append((model_app_label, model_name))
|
||||
# Reload models related to old model before removing the old model.
|
||||
state.reload_models(to_reload, delay=True)
|
||||
# Remove the old model.
|
||||
state.remove_model(app_label, self.old_name_lower)
|
||||
state.reload_model(app_label, self.new_name_lower, delay=True)
|
||||
|
||||
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
||||
new_model = to_state.apps.get_model(app_label, self.new_name)
|
||||
if self.allow_migrate_model(schema_editor.connection.alias, new_model):
|
||||
old_model = from_state.apps.get_model(app_label, self.old_name)
|
||||
# Move the main table
|
||||
schema_editor.alter_db_table(
|
||||
new_model,
|
||||
old_model._meta.db_table,
|
||||
new_model._meta.db_table,
|
||||
)
|
||||
# Alter the fields pointing to us
|
||||
for related_object in old_model._meta.related_objects:
|
||||
if related_object.related_model == old_model:
|
||||
model = new_model
|
||||
related_key = (app_label, self.new_name_lower)
|
||||
else:
|
||||
model = related_object.related_model
|
||||
related_key = (
|
||||
related_object.related_model._meta.app_label,
|
||||
related_object.related_model._meta.model_name,
|
||||
)
|
||||
to_field = to_state.apps.get_model(
|
||||
*related_key
|
||||
)._meta.get_field(related_object.field.name)
|
||||
schema_editor.alter_field(
|
||||
model,
|
||||
related_object.field,
|
||||
to_field,
|
||||
)
|
||||
# Rename M2M fields whose name is based on this model's name.
|
||||
fields = zip(old_model._meta.local_many_to_many, new_model._meta.local_many_to_many)
|
||||
for (old_field, new_field) in fields:
|
||||
# Skip self-referential fields as these are renamed above.
|
||||
if new_field.model == new_field.related_model or not new_field.remote_field.through._meta.auto_created:
|
||||
continue
|
||||
# Rename the M2M table that's based on this model's name.
|
||||
old_m2m_model = old_field.remote_field.through
|
||||
new_m2m_model = new_field.remote_field.through
|
||||
schema_editor.alter_db_table(
|
||||
new_m2m_model,
|
||||
old_m2m_model._meta.db_table,
|
||||
new_m2m_model._meta.db_table,
|
||||
)
|
||||
# Rename the column in the M2M table that's based on this
|
||||
# model's name.
|
||||
schema_editor.alter_field(
|
||||
new_m2m_model,
|
||||
old_m2m_model._meta.get_field(old_model._meta.model_name),
|
||||
new_m2m_model._meta.get_field(new_model._meta.model_name),
|
||||
)
|
||||
|
||||
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
||||
self.new_name_lower, self.old_name_lower = self.old_name_lower, self.new_name_lower
|
||||
self.new_name, self.old_name = self.old_name, self.new_name
|
||||
|
||||
self.database_forwards(app_label, schema_editor, from_state, to_state)
|
||||
|
||||
self.new_name_lower, self.old_name_lower = self.old_name_lower, self.new_name_lower
|
||||
self.new_name, self.old_name = self.old_name, self.new_name
|
||||
|
||||
def references_model(self, name, app_label=None):
|
||||
return (
|
||||
name.lower() == self.old_name_lower or
|
||||
name.lower() == self.new_name_lower
|
||||
)
|
||||
|
||||
def describe(self):
|
||||
return "Rename model %s to %s" % (self.old_name, self.new_name)
|
||||
|
||||
def reduce(self, operation, in_between, app_label=None):
|
||||
if (isinstance(operation, RenameModel) and
|
||||
self.new_name_lower == operation.old_name_lower):
|
||||
return [
|
||||
RenameModel(
|
||||
self.old_name,
|
||||
operation.new_name,
|
||||
),
|
||||
]
|
||||
# Skip `ModelOperation.reduce` as we want to run `references_model`
|
||||
# against self.new_name.
|
||||
return (
|
||||
super(ModelOperation, self).reduce(operation, in_between, app_label=app_label) or
|
||||
not operation.references_model(self.new_name, app_label)
|
||||
)
|
||||
|
||||
|
||||
class AlterModelTable(ModelOperation):
|
||||
"""Rename a model's table."""
|
||||
|
||||
def __init__(self, name, table):
|
||||
self.table = table
|
||||
super().__init__(name)
|
||||
|
||||
def deconstruct(self):
|
||||
kwargs = {
|
||||
'name': self.name,
|
||||
'table': self.table,
|
||||
}
|
||||
return (
|
||||
self.__class__.__qualname__,
|
||||
[],
|
||||
kwargs
|
||||
)
|
||||
|
||||
def state_forwards(self, app_label, state):
|
||||
state.models[app_label, self.name_lower].options["db_table"] = self.table
|
||||
state.reload_model(app_label, self.name_lower, delay=True)
|
||||
|
||||
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
||||
new_model = to_state.apps.get_model(app_label, self.name)
|
||||
if self.allow_migrate_model(schema_editor.connection.alias, new_model):
|
||||
old_model = from_state.apps.get_model(app_label, self.name)
|
||||
schema_editor.alter_db_table(
|
||||
new_model,
|
||||
old_model._meta.db_table,
|
||||
new_model._meta.db_table,
|
||||
)
|
||||
# Rename M2M fields whose name is based on this model's db_table
|
||||
for (old_field, new_field) in zip(old_model._meta.local_many_to_many, new_model._meta.local_many_to_many):
|
||||
if new_field.remote_field.through._meta.auto_created:
|
||||
schema_editor.alter_db_table(
|
||||
new_field.remote_field.through,
|
||||
old_field.remote_field.through._meta.db_table,
|
||||
new_field.remote_field.through._meta.db_table,
|
||||
)
|
||||
|
||||
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
||||
return self.database_forwards(app_label, schema_editor, from_state, to_state)
|
||||
|
||||
def describe(self):
|
||||
return "Rename table for %s to %s" % (
|
||||
self.name,
|
||||
self.table if self.table is not None else "(default)"
|
||||
)
|
||||
|
||||
def reduce(self, operation, in_between, app_label=None):
|
||||
if isinstance(operation, (AlterModelTable, DeleteModel)) and self.name_lower == operation.name_lower:
|
||||
return [operation]
|
||||
return super().reduce(operation, in_between, app_label=app_label)
|
||||
|
||||
|
||||
class ModelOptionOperation(ModelOperation):
|
||||
def reduce(self, operation, in_between, app_label=None):
|
||||
if isinstance(operation, (self.__class__, DeleteModel)) and self.name_lower == operation.name_lower:
|
||||
return [operation]
|
||||
return super().reduce(operation, in_between, app_label=app_label)
|
||||
|
||||
|
||||
class FieldRelatedOptionOperation(ModelOptionOperation):
|
||||
def reduce(self, operation, in_between, app_label=None):
|
||||
if (isinstance(operation, FieldOperation) and
|
||||
self.name_lower == operation.model_name_lower and
|
||||
not self.references_field(operation.model_name, operation.name)):
|
||||
return [operation, self]
|
||||
return super().reduce(operation, in_between, app_label=app_label)
|
||||
|
||||
|
||||
class AlterUniqueTogether(FieldRelatedOptionOperation):
|
||||
"""
|
||||
Change the value of unique_together to the target one.
|
||||
Input value of unique_together must be a set of tuples.
|
||||
"""
|
||||
option_name = "unique_together"
|
||||
|
||||
def __init__(self, name, unique_together):
|
||||
unique_together = normalize_together(unique_together)
|
||||
self.unique_together = {tuple(cons) for cons in unique_together}
|
||||
super().__init__(name)
|
||||
|
||||
def deconstruct(self):
|
||||
kwargs = {
|
||||
'name': self.name,
|
||||
'unique_together': self.unique_together,
|
||||
}
|
||||
return (
|
||||
self.__class__.__qualname__,
|
||||
[],
|
||||
kwargs
|
||||
)
|
||||
|
||||
def state_forwards(self, app_label, state):
|
||||
model_state = state.models[app_label, self.name_lower]
|
||||
model_state.options[self.option_name] = self.unique_together
|
||||
state.reload_model(app_label, self.name_lower, delay=True)
|
||||
|
||||
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
||||
new_model = to_state.apps.get_model(app_label, self.name)
|
||||
if self.allow_migrate_model(schema_editor.connection.alias, new_model):
|
||||
old_model = from_state.apps.get_model(app_label, self.name)
|
||||
schema_editor.alter_unique_together(
|
||||
new_model,
|
||||
getattr(old_model._meta, self.option_name, set()),
|
||||
getattr(new_model._meta, self.option_name, set()),
|
||||
)
|
||||
|
||||
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
||||
return self.database_forwards(app_label, schema_editor, from_state, to_state)
|
||||
|
||||
def references_field(self, model_name, name, app_label=None):
|
||||
return (
|
||||
self.references_model(model_name, app_label) and
|
||||
(
|
||||
not self.unique_together or
|
||||
any((name in together) for together in self.unique_together)
|
||||
)
|
||||
)
|
||||
|
||||
def describe(self):
|
||||
return "Alter %s for %s (%s constraint(s))" % (self.option_name, self.name, len(self.unique_together or ''))
|
||||
|
||||
|
||||
class AlterIndexTogether(FieldRelatedOptionOperation):
|
||||
"""
|
||||
Change the value of index_together to the target one.
|
||||
Input value of index_together must be a set of tuples.
|
||||
"""
|
||||
option_name = "index_together"
|
||||
|
||||
def __init__(self, name, index_together):
|
||||
index_together = normalize_together(index_together)
|
||||
self.index_together = {tuple(cons) for cons in index_together}
|
||||
super().__init__(name)
|
||||
|
||||
def deconstruct(self):
|
||||
kwargs = {
|
||||
'name': self.name,
|
||||
'index_together': self.index_together,
|
||||
}
|
||||
return (
|
||||
self.__class__.__qualname__,
|
||||
[],
|
||||
kwargs
|
||||
)
|
||||
|
||||
def state_forwards(self, app_label, state):
|
||||
model_state = state.models[app_label, self.name_lower]
|
||||
model_state.options[self.option_name] = self.index_together
|
||||
state.reload_model(app_label, self.name_lower, delay=True)
|
||||
|
||||
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
||||
new_model = to_state.apps.get_model(app_label, self.name)
|
||||
if self.allow_migrate_model(schema_editor.connection.alias, new_model):
|
||||
old_model = from_state.apps.get_model(app_label, self.name)
|
||||
schema_editor.alter_index_together(
|
||||
new_model,
|
||||
getattr(old_model._meta, self.option_name, set()),
|
||||
getattr(new_model._meta, self.option_name, set()),
|
||||
)
|
||||
|
||||
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
||||
return self.database_forwards(app_label, schema_editor, from_state, to_state)
|
||||
|
||||
def references_field(self, model_name, name, app_label=None):
|
||||
return (
|
||||
self.references_model(model_name, app_label) and
|
||||
(
|
||||
not self.index_together or
|
||||
any((name in together) for together in self.index_together)
|
||||
)
|
||||
)
|
||||
|
||||
def describe(self):
|
||||
return "Alter %s for %s (%s constraint(s))" % (self.option_name, self.name, len(self.index_together or ''))
|
||||
|
||||
|
||||
class AlterOrderWithRespectTo(FieldRelatedOptionOperation):
|
||||
"""Represent a change with the order_with_respect_to option."""
|
||||
|
||||
def __init__(self, name, order_with_respect_to):
|
||||
self.order_with_respect_to = order_with_respect_to
|
||||
super().__init__(name)
|
||||
|
||||
def deconstruct(self):
|
||||
kwargs = {
|
||||
'name': self.name,
|
||||
'order_with_respect_to': self.order_with_respect_to,
|
||||
}
|
||||
return (
|
||||
self.__class__.__qualname__,
|
||||
[],
|
||||
kwargs
|
||||
)
|
||||
|
||||
def state_forwards(self, app_label, state):
|
||||
model_state = state.models[app_label, self.name_lower]
|
||||
model_state.options['order_with_respect_to'] = self.order_with_respect_to
|
||||
state.reload_model(app_label, self.name_lower, delay=True)
|
||||
|
||||
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
||||
to_model = to_state.apps.get_model(app_label, self.name)
|
||||
if self.allow_migrate_model(schema_editor.connection.alias, to_model):
|
||||
from_model = from_state.apps.get_model(app_label, self.name)
|
||||
# Remove a field if we need to
|
||||
if from_model._meta.order_with_respect_to and not to_model._meta.order_with_respect_to:
|
||||
schema_editor.remove_field(from_model, from_model._meta.get_field("_order"))
|
||||
# Add a field if we need to (altering the column is untouched as
|
||||
# it's likely a rename)
|
||||
elif to_model._meta.order_with_respect_to and not from_model._meta.order_with_respect_to:
|
||||
field = to_model._meta.get_field("_order")
|
||||
if not field.has_default():
|
||||
field.default = 0
|
||||
schema_editor.add_field(
|
||||
from_model,
|
||||
field,
|
||||
)
|
||||
|
||||
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
||||
self.database_forwards(app_label, schema_editor, from_state, to_state)
|
||||
|
||||
def references_field(self, model_name, name, app_label=None):
|
||||
return (
|
||||
self.references_model(model_name, app_label) and
|
||||
(
|
||||
self.order_with_respect_to is None or
|
||||
name == self.order_with_respect_to
|
||||
)
|
||||
)
|
||||
|
||||
def describe(self):
|
||||
return "Set order_with_respect_to on %s to %s" % (self.name, self.order_with_respect_to)
|
||||
|
||||
|
||||
class AlterModelOptions(ModelOptionOperation):
|
||||
"""
|
||||
Set new model options that don't directly affect the database schema
|
||||
(like verbose_name, permissions, ordering). Python code in migrations
|
||||
may still need them.
|
||||
"""
|
||||
|
||||
# Model options we want to compare and preserve in an AlterModelOptions op
|
||||
ALTER_OPTION_KEYS = [
|
||||
"base_manager_name",
|
||||
"default_manager_name",
|
||||
"get_latest_by",
|
||||
"managed",
|
||||
"ordering",
|
||||
"permissions",
|
||||
"default_permissions",
|
||||
"select_on_save",
|
||||
"verbose_name",
|
||||
"verbose_name_plural",
|
||||
]
|
||||
|
||||
def __init__(self, name, options):
|
||||
self.options = options
|
||||
super().__init__(name)
|
||||
|
||||
def deconstruct(self):
|
||||
kwargs = {
|
||||
'name': self.name,
|
||||
'options': self.options,
|
||||
}
|
||||
return (
|
||||
self.__class__.__qualname__,
|
||||
[],
|
||||
kwargs
|
||||
)
|
||||
|
||||
def state_forwards(self, app_label, state):
|
||||
model_state = state.models[app_label, self.name_lower]
|
||||
model_state.options = dict(model_state.options)
|
||||
model_state.options.update(self.options)
|
||||
for key in self.ALTER_OPTION_KEYS:
|
||||
if key not in self.options and key in model_state.options:
|
||||
del model_state.options[key]
|
||||
state.reload_model(app_label, self.name_lower, delay=True)
|
||||
|
||||
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
||||
pass
|
||||
|
||||
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
||||
pass
|
||||
|
||||
def describe(self):
|
||||
return "Change Meta options on %s" % (self.name, )
|
||||
|
||||
|
||||
class AlterModelManagers(ModelOptionOperation):
|
||||
"""Alter the model's managers."""
|
||||
|
||||
serialization_expand_args = ['managers']
|
||||
|
||||
def __init__(self, name, managers):
|
||||
self.managers = managers
|
||||
super().__init__(name)
|
||||
|
||||
def deconstruct(self):
|
||||
return (
|
||||
self.__class__.__qualname__,
|
||||
[self.name, self.managers],
|
||||
{}
|
||||
)
|
||||
|
||||
def state_forwards(self, app_label, state):
|
||||
model_state = state.models[app_label, self.name_lower]
|
||||
model_state.managers = list(self.managers)
|
||||
state.reload_model(app_label, self.name_lower, delay=True)
|
||||
|
||||
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
||||
pass
|
||||
|
||||
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
||||
pass
|
||||
|
||||
def describe(self):
|
||||
return "Change managers on %s" % (self.name, )
|
||||
|
||||
|
||||
class IndexOperation(Operation):
|
||||
option_name = 'indexes'
|
||||
|
||||
@cached_property
|
||||
def model_name_lower(self):
|
||||
return self.model_name.lower()
|
||||
|
||||
|
||||
class AddIndex(IndexOperation):
|
||||
"""Add an index on a model."""
|
||||
|
||||
def __init__(self, model_name, index):
|
||||
self.model_name = model_name
|
||||
if not index.name:
|
||||
raise ValueError(
|
||||
"Indexes passed to AddIndex operations require a name "
|
||||
"argument. %r doesn't have one." % index
|
||||
)
|
||||
self.index = index
|
||||
|
||||
def state_forwards(self, app_label, state):
|
||||
model_state = state.models[app_label, self.model_name_lower]
|
||||
indexes = list(model_state.options[self.option_name])
|
||||
indexes.append(self.index.clone())
|
||||
model_state.options[self.option_name] = indexes
|
||||
state.reload_model(app_label, self.model_name_lower, delay=True)
|
||||
|
||||
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
||||
model = to_state.apps.get_model(app_label, self.model_name)
|
||||
if self.allow_migrate_model(schema_editor.connection.alias, model):
|
||||
schema_editor.add_index(model, self.index)
|
||||
|
||||
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
||||
model = from_state.apps.get_model(app_label, self.model_name)
|
||||
if self.allow_migrate_model(schema_editor.connection.alias, model):
|
||||
schema_editor.remove_index(model, self.index)
|
||||
|
||||
def deconstruct(self):
|
||||
kwargs = {
|
||||
'model_name': self.model_name,
|
||||
'index': self.index,
|
||||
}
|
||||
return (
|
||||
self.__class__.__qualname__,
|
||||
[],
|
||||
kwargs,
|
||||
)
|
||||
|
||||
def describe(self):
|
||||
return 'Create index %s on field(s) %s of model %s' % (
|
||||
self.index.name,
|
||||
', '.join(self.index.fields),
|
||||
self.model_name,
|
||||
)
|
||||
|
||||
|
||||
class RemoveIndex(IndexOperation):
|
||||
"""Remove an index from a model."""
|
||||
|
||||
def __init__(self, model_name, name):
|
||||
self.model_name = model_name
|
||||
self.name = name
|
||||
|
||||
def state_forwards(self, app_label, state):
|
||||
model_state = state.models[app_label, self.model_name_lower]
|
||||
indexes = model_state.options[self.option_name]
|
||||
model_state.options[self.option_name] = [idx for idx in indexes if idx.name != self.name]
|
||||
state.reload_model(app_label, self.model_name_lower, delay=True)
|
||||
|
||||
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
||||
model = from_state.apps.get_model(app_label, self.model_name)
|
||||
if self.allow_migrate_model(schema_editor.connection.alias, model):
|
||||
from_model_state = from_state.models[app_label, self.model_name_lower]
|
||||
index = from_model_state.get_index_by_name(self.name)
|
||||
schema_editor.remove_index(model, index)
|
||||
|
||||
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
||||
model = to_state.apps.get_model(app_label, self.model_name)
|
||||
if self.allow_migrate_model(schema_editor.connection.alias, model):
|
||||
to_model_state = to_state.models[app_label, self.model_name_lower]
|
||||
index = to_model_state.get_index_by_name(self.name)
|
||||
schema_editor.add_index(model, index)
|
||||
|
||||
def deconstruct(self):
|
||||
kwargs = {
|
||||
'model_name': self.model_name,
|
||||
'name': self.name,
|
||||
}
|
||||
return (
|
||||
self.__class__.__qualname__,
|
||||
[],
|
||||
kwargs,
|
||||
)
|
||||
|
||||
def describe(self):
|
||||
return 'Remove index %s from %s' % (self.name, self.model_name)
|
||||
@@ -0,0 +1,203 @@
|
||||
from django.db import router
|
||||
|
||||
from .base import Operation
|
||||
|
||||
|
||||
class SeparateDatabaseAndState(Operation):
|
||||
"""
|
||||
Take two lists of operations - ones that will be used for the database,
|
||||
and ones that will be used for the state change. This allows operations
|
||||
that don't support state change to have it applied, or have operations
|
||||
that affect the state or not the database, or so on.
|
||||
"""
|
||||
|
||||
serialization_expand_args = ['database_operations', 'state_operations']
|
||||
|
||||
def __init__(self, database_operations=None, state_operations=None):
|
||||
self.database_operations = database_operations or []
|
||||
self.state_operations = state_operations or []
|
||||
|
||||
def deconstruct(self):
|
||||
kwargs = {}
|
||||
if self.database_operations:
|
||||
kwargs['database_operations'] = self.database_operations
|
||||
if self.state_operations:
|
||||
kwargs['state_operations'] = self.state_operations
|
||||
return (
|
||||
self.__class__.__qualname__,
|
||||
[],
|
||||
kwargs
|
||||
)
|
||||
|
||||
def state_forwards(self, app_label, state):
|
||||
for state_operation in self.state_operations:
|
||||
state_operation.state_forwards(app_label, state)
|
||||
|
||||
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
||||
# We calculate state separately in here since our state functions aren't useful
|
||||
for database_operation in self.database_operations:
|
||||
to_state = from_state.clone()
|
||||
database_operation.state_forwards(app_label, to_state)
|
||||
database_operation.database_forwards(app_label, schema_editor, from_state, to_state)
|
||||
from_state = to_state
|
||||
|
||||
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
||||
# We calculate state separately in here since our state functions aren't useful
|
||||
to_states = {}
|
||||
for dbop in self.database_operations:
|
||||
to_states[dbop] = to_state
|
||||
to_state = to_state.clone()
|
||||
dbop.state_forwards(app_label, to_state)
|
||||
# to_state now has the states of all the database_operations applied
|
||||
# which is the from_state for the backwards migration of the last
|
||||
# operation.
|
||||
for database_operation in reversed(self.database_operations):
|
||||
from_state = to_state
|
||||
to_state = to_states[database_operation]
|
||||
database_operation.database_backwards(app_label, schema_editor, from_state, to_state)
|
||||
|
||||
def describe(self):
|
||||
return "Custom state/database change combination"
|
||||
|
||||
|
||||
class RunSQL(Operation):
|
||||
"""
|
||||
Run some raw SQL. A reverse SQL statement may be provided.
|
||||
|
||||
Also accept a list of operations that represent the state change effected
|
||||
by this SQL change, in case it's custom column/table creation/deletion.
|
||||
"""
|
||||
noop = ''
|
||||
|
||||
def __init__(self, sql, reverse_sql=None, state_operations=None, hints=None, elidable=False):
|
||||
self.sql = sql
|
||||
self.reverse_sql = reverse_sql
|
||||
self.state_operations = state_operations or []
|
||||
self.hints = hints or {}
|
||||
self.elidable = elidable
|
||||
|
||||
def deconstruct(self):
|
||||
kwargs = {
|
||||
'sql': self.sql,
|
||||
}
|
||||
if self.reverse_sql is not None:
|
||||
kwargs['reverse_sql'] = self.reverse_sql
|
||||
if self.state_operations:
|
||||
kwargs['state_operations'] = self.state_operations
|
||||
if self.hints:
|
||||
kwargs['hints'] = self.hints
|
||||
return (
|
||||
self.__class__.__qualname__,
|
||||
[],
|
||||
kwargs
|
||||
)
|
||||
|
||||
@property
|
||||
def reversible(self):
|
||||
return self.reverse_sql is not None
|
||||
|
||||
def state_forwards(self, app_label, state):
|
||||
for state_operation in self.state_operations:
|
||||
state_operation.state_forwards(app_label, state)
|
||||
|
||||
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
||||
if router.allow_migrate(schema_editor.connection.alias, app_label, **self.hints):
|
||||
self._run_sql(schema_editor, self.sql)
|
||||
|
||||
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
||||
if self.reverse_sql is None:
|
||||
raise NotImplementedError("You cannot reverse this operation")
|
||||
if router.allow_migrate(schema_editor.connection.alias, app_label, **self.hints):
|
||||
self._run_sql(schema_editor, self.reverse_sql)
|
||||
|
||||
def describe(self):
|
||||
return "Raw SQL operation"
|
||||
|
||||
def _run_sql(self, schema_editor, sqls):
|
||||
if isinstance(sqls, (list, tuple)):
|
||||
for sql in sqls:
|
||||
params = None
|
||||
if isinstance(sql, (list, tuple)):
|
||||
elements = len(sql)
|
||||
if elements == 2:
|
||||
sql, params = sql
|
||||
else:
|
||||
raise ValueError("Expected a 2-tuple but got %d" % elements)
|
||||
schema_editor.execute(sql, params=params)
|
||||
elif sqls != RunSQL.noop:
|
||||
statements = schema_editor.connection.ops.prepare_sql_script(sqls)
|
||||
for statement in statements:
|
||||
schema_editor.execute(statement, params=None)
|
||||
|
||||
|
||||
class RunPython(Operation):
|
||||
"""
|
||||
Run Python code in a context suitable for doing versioned ORM operations.
|
||||
"""
|
||||
|
||||
reduces_to_sql = False
|
||||
|
||||
def __init__(self, code, reverse_code=None, atomic=None, hints=None, elidable=False):
|
||||
self.atomic = atomic
|
||||
# Forwards code
|
||||
if not callable(code):
|
||||
raise ValueError("RunPython must be supplied with a callable")
|
||||
self.code = code
|
||||
# Reverse code
|
||||
if reverse_code is None:
|
||||
self.reverse_code = None
|
||||
else:
|
||||
if not callable(reverse_code):
|
||||
raise ValueError("RunPython must be supplied with callable arguments")
|
||||
self.reverse_code = reverse_code
|
||||
self.hints = hints or {}
|
||||
self.elidable = elidable
|
||||
|
||||
def deconstruct(self):
|
||||
kwargs = {
|
||||
'code': self.code,
|
||||
}
|
||||
if self.reverse_code is not None:
|
||||
kwargs['reverse_code'] = self.reverse_code
|
||||
if self.atomic is not None:
|
||||
kwargs['atomic'] = self.atomic
|
||||
if self.hints:
|
||||
kwargs['hints'] = self.hints
|
||||
return (
|
||||
self.__class__.__qualname__,
|
||||
[],
|
||||
kwargs
|
||||
)
|
||||
|
||||
@property
|
||||
def reversible(self):
|
||||
return self.reverse_code is not None
|
||||
|
||||
def state_forwards(self, app_label, state):
|
||||
# RunPython objects have no state effect. To add some, combine this
|
||||
# with SeparateDatabaseAndState.
|
||||
pass
|
||||
|
||||
def database_forwards(self, app_label, schema_editor, from_state, to_state):
|
||||
# RunPython has access to all models. Ensure that all models are
|
||||
# reloaded in case any are delayed.
|
||||
from_state.clear_delayed_apps_cache()
|
||||
if router.allow_migrate(schema_editor.connection.alias, app_label, **self.hints):
|
||||
# We now execute the Python code in a context that contains a 'models'
|
||||
# object, representing the versioned models as an app registry.
|
||||
# We could try to override the global cache, but then people will still
|
||||
# use direct imports, so we go with a documentation approach instead.
|
||||
self.code(from_state.apps, schema_editor)
|
||||
|
||||
def database_backwards(self, app_label, schema_editor, from_state, to_state):
|
||||
if self.reverse_code is None:
|
||||
raise NotImplementedError("You cannot reverse this operation")
|
||||
if router.allow_migrate(schema_editor.connection.alias, app_label, **self.hints):
|
||||
self.reverse_code(from_state.apps, schema_editor)
|
||||
|
||||
def describe(self):
|
||||
return "Raw Python operation"
|
||||
|
||||
@staticmethod
|
||||
def noop(apps, schema_editor):
|
||||
return None
|
||||
@@ -0,0 +1,9 @@
|
||||
def is_referenced_by_foreign_key(state, model_name_lower, field, field_name):
|
||||
for state_app_label, state_model in state.models:
|
||||
for _, f in state.models[state_app_label, state_model].fields:
|
||||
if (f.related_model and
|
||||
'%s.%s' % (state_app_label, model_name_lower) == f.related_model.lower() and
|
||||
hasattr(f, 'to_fields')):
|
||||
if (f.to_fields[0] is None and field.primary_key) or field_name in f.to_fields:
|
||||
return True
|
||||
return False
|
||||
Reference in New Issue
Block a user