Add support for inline fragments (#65)

## Summary:
In this commit I add support for inline fragments
(`... on MyType { fields }`) to genqlient.  This will make interfaces a
lot more useful!  In future commits I'll add named fragments, for which
we'll generate slightly different types, as discussed in DESIGN.md.

In general, implementing the flattening approach described in DESIGN.md
was... surprisingly easy.  All we have to do is recurse on applicable
fragments when generating our selection-set.  The refactor to
selection-set handling this encouraged was, I think, quite beneficial.
It did reveal two tricky pre-existing issues.

One issue is that GraphQL allows for duplicate selections, as long as
they match.  (In practice, this is only useful in the context of
fragments, although GraphQL allows it even without.) I decided to handle
the simple case (duplicate leaf fields; we just deduplicate) but leave
to the future the complex cases where we need to merge different
sub-selections (now #64).  For now we just forbid that; we can see how
much it comes up.

The other issue is that we are generating type-names incorrectly for
interface types; I had intended to do `MyInterfaceMyFieldMyType` for
shared fields and `MyImplMyFieldMyType` for non-shared ones, but instead
I did `MyFieldMyType`, which is inconsistent already and can result in
conflicts in the presence of fragments.  I'm going to fix this in a
separate commit, though, because it's going to require some refactoring
and is irrelevant to the main logic of this commit; I left some TODOs in
the tests related to this.

Issue: https://github.com/Khan/genqlient/issues/8

## Test plan:
make check


Author: benjaminjkraft

Reviewers: dnerdy, aberkan, MiguelCastillo

Required Reviewers: 

Approved by: dnerdy

Checks: ⌛ Test (1.17), ⌛ Test (1.16), ⌛ Test (1.15), ⌛ Test (1.14), ⌛ Test (1.13), ✅ Lint, ⌛ Test (1.17), ⌛ Test (1.16), ⌛ Test (1.15), ⌛ Test (1.14), ⌛ Test (1.13), ✅ Lint

Pull request URL: https://github.com/Khan/genqlient/pull/65

generate/testdata/errors/ConflictingSelections.go

@@ -0,0 +1,12 @@
+package errors
+
+const _ = `# @genqlient
+query {
+  myField {
+    subField { subSubField1 subSubField2 }
+    ... on OnePossibleConcreteType {
+      subField { subSubField3 subSubField4 }
+    }
+  }
+}
+`

generate/testdata/errors/ConflictingSelections.graphql

@@ -0,0 +1,8 @@
+query {
+  myField {
+    subField { subSubField1 subSubField2 }
+    ... on OnePossibleConcreteType {
+      subField { subSubField3 subSubField4 }
+    }
+  }
+}

generate/testdata/errors/ConflictingSelections.schema.graphql

@@ -0,0 +1,18 @@
+type Query {
+  myField: InterfaceType
+}
+
+interface InterfaceType {
+  subField: SubFieldType
+}
+
+type OnePossibleConcreteType implements InterfaceType {
+  subField: SubFieldType
+}
+
+type SubFieldType {
+  subSubField1: String!
+  subSubField2: String!
+  subSubField3: String!
+  subSubField4: String!
+}

generate/testdata/queries/ComplexInlineFragments.graphql

@@ -0,0 +1,69 @@
+# We test all the spread cases from DESIGN.md, see there for more context on
+# each, as well as various other nonsense.  But for abstract-in-abstract
+# spreads, we can't test cases (4b) and (4c), where I implements J or vice
+# versa, because gqlparser doesn't support interfaces that implement other
+# interfaces yet.
+query ComplexInlineFragments {
+  root {
+    id
+    ... on Topic { schoolGrade }  # (1) object spread in object scope
+    ... on Content { name }       # (3) abstract spread in object scope
+  }
+  randomItem {
+    id
+    ... on Article { text }          # (2) object spread in abstract scope
+    ... on Content { name }          # (4a) abstract spread in abstract scope, I == J
+    ... on HasDuration { duration }  # (4d) abstract spread in abstract scope, neither implements the other
+  }
+  repeatedStuff: randomItem {
+    id
+    id
+    url
+    otherId: id
+    ... on Article {
+      name
+      text
+      otherName: name
+    }
+    ... on Content {
+      id
+      name
+      otherName: name
+    }
+    ... on HasDuration { duration }
+  }
+  conflictingStuff: randomItem {
+    # These two have different types!  Naming gets complicated.  Note GraphQL
+    # says [1] that you can only have such naming conflicts when the fields are
+    # both on object-typed spreads (reasonable, so they can never collide) and
+    # they are of "shapes that can be merged", e.g. both nullable objects,
+    # which seems very strange to me but is the most interesting case for us
+    # anyway (since where we could have trouble is naming the result types).
+    # [1] https://spec.graphql.org/draft/#SameResponseShape()
+    # TODO(benkraft): This actually generates the wrong thing right now (the
+    # two thumbnail types get the same name, and one clobbers the other).  Fix
+    # in a follow-up commit.
+    ... on Article { thumbnail { id thumbnailUrl } }
+    ... on Video { thumbnail { id timestampSec } }
+  }
+  nestedStuff: randomItem {
+    ... on Topic {
+      children {
+        id
+        ... on Article {
+          text
+          parent {
+            ... on Content {
+              name
+              parent {
+                ... on Topic {
+                  children { id name }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}

generate/testdata/queries/SimpleInlineFragment.graphql

@@ -0,0 +1,8 @@
+query SimpleInlineFragment {
+  randomItem {
+    id
+    name
+    ... on Article { text }
+    ... on Video { duration }
+  }
+}

generate/testdata/queries/schema.graphql

@@ -65,6 +65,13 @@ type User {
   emailsWithNullsOrNull: [String]
   authMethods: [AuthMethod!]!
   pokemon: [Pokemon!]
+  greeting: Clip
+}
+
+"""An audio clip, such as of a user saying hello."""
+type Clip implements HasDuration {
+  id: ID!
+  duration: Int!
 }
 
 """Content is implemented by various types like Article, Video, and Topic."""
@@ -73,6 +80,12 @@ interface Content {
   id: ID!
   name: String!
   parent: Topic
+  url: String!
+}
+
+"""An object with a duration, like a video."""
+interface HasDuration {
+  duration: Int!
 }
 
 """LeafContent represents content items that can't have child-nodes."""
@@ -83,15 +96,29 @@ type Article implements Content {
   id: ID!
   name: String!
   parent: Topic!
+  url: String!
   text: String!
+  thumbnail: StuffThumbnail
 }
 
-type Video implements Content {
+type StuffThumbnail {  # for articles, but let's give the name-generator a hard time.
+  id: ID!
+  thumbnailUrl: String!
+}
+
+type Video implements Content & HasDuration {
   """ID is documented in the Content interface."""
   id: ID!
   name: String!
   parent: Topic!
+  url: String!
   duration: Int!
+  thumbnail: Thumbnail
+}
+
+type Thumbnail {  # for videos, but let's give the name-generator a hard time.
+  id: ID!
+  timestampSec: Int!
 }
 
 type Topic implements Content {
@@ -99,7 +126,9 @@ type Topic implements Content {
   id: ID!
   name: String!
   parent: Topic
+  url: String!
   children: [Content!]!
+  schoolGrade: String
 }
 
 """Query's description is probably ignored by almost all callers."""

generate/testdata/snapshots/TestGenerate-ComplexInlineFragments.graphql-ComplexInlineFragments.graphql.go

@@ -0,0 +1,939 @@
+package test
+
+// Code generated by github.com/Khan/genqlient, DO NOT EDIT.
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/Khan/genqlient/graphql"
+	"github.com/Khan/genqlient/internal/testutil"
+)
+
+// ComplexInlineFragmentsConflictingStuffArticle includes the requested fields of the GraphQL type Article.
+type ComplexInlineFragmentsConflictingStuffArticle struct {
+	Typename  string                                          `json:"__typename"`
+	Thumbnail ComplexInlineFragmentsConflictingStuffThumbnail `json:"thumbnail"`
+}
+
+// ComplexInlineFragmentsConflictingStuffContent includes the requested fields of the GraphQL interface Content.
+//
+// ComplexInlineFragmentsConflictingStuffContent is implemented by the following types:
+// ComplexInlineFragmentsConflictingStuffArticle
+// ComplexInlineFragmentsConflictingStuffVideo
+// ComplexInlineFragmentsConflictingStuffTopic
+//
+// The GraphQL type's documentation follows.
+//
+// Content is implemented by various types like Article, Video, and Topic.
+type ComplexInlineFragmentsConflictingStuffContent interface {
+	implementsGraphQLInterfaceComplexInlineFragmentsConflictingStuffContent()
+	// GetTypename returns the receiver's concrete GraphQL type-name (see interface doc for possible values).
+	GetTypename() string
+}
+
+func (v *ComplexInlineFragmentsConflictingStuffArticle) implementsGraphQLInterfaceComplexInlineFragmentsConflictingStuffContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsConflictingStuffContent.
+func (v *ComplexInlineFragmentsConflictingStuffArticle) GetTypename() string { return v.Typename }
+
+func (v *ComplexInlineFragmentsConflictingStuffVideo) implementsGraphQLInterfaceComplexInlineFragmentsConflictingStuffContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsConflictingStuffContent.
+func (v *ComplexInlineFragmentsConflictingStuffVideo) GetTypename() string { return v.Typename }
+
+func (v *ComplexInlineFragmentsConflictingStuffTopic) implementsGraphQLInterfaceComplexInlineFragmentsConflictingStuffContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsConflictingStuffContent.
+func (v *ComplexInlineFragmentsConflictingStuffTopic) GetTypename() string { return v.Typename }
+
+func __unmarshalComplexInlineFragmentsConflictingStuffContent(v *ComplexInlineFragmentsConflictingStuffContent, m json.RawMessage) error {
+	if string(m) == "null" {
+		return nil
+	}
+
+	var tn struct {
+		TypeName string `json:"__typename"`
+	}
+	err := json.Unmarshal(m, &tn)
+	if err != nil {
+		return err
+	}
+
+	switch tn.TypeName {
+	case "Article":
+		*v = new(ComplexInlineFragmentsConflictingStuffArticle)
+		return json.Unmarshal(m, *v)
+	case "Video":
+		*v = new(ComplexInlineFragmentsConflictingStuffVideo)
+		return json.Unmarshal(m, *v)
+	case "Topic":
+		*v = new(ComplexInlineFragmentsConflictingStuffTopic)
+		return json.Unmarshal(m, *v)
+	default:
+		return fmt.Errorf(
+			`Unexpected concrete type for ComplexInlineFragmentsConflictingStuffContent: "%v"`, tn.TypeName)
+	}
+}
+
+// ComplexInlineFragmentsConflictingStuffThumbnail includes the requested fields of the GraphQL type Thumbnail.
+type ComplexInlineFragmentsConflictingStuffThumbnail struct {
+	Id           testutil.ID `json:"id"`
+	TimestampSec int         `json:"timestampSec"`
+}
+
+// ComplexInlineFragmentsConflictingStuffTopic includes the requested fields of the GraphQL type Topic.
+type ComplexInlineFragmentsConflictingStuffTopic struct {
+	Typename string `json:"__typename"`
+}
+
+// ComplexInlineFragmentsConflictingStuffVideo includes the requested fields of the GraphQL type Video.
+type ComplexInlineFragmentsConflictingStuffVideo struct {
+	Typename  string                                          `json:"__typename"`
+	Thumbnail ComplexInlineFragmentsConflictingStuffThumbnail `json:"thumbnail"`
+}
+
+// ComplexInlineFragmentsNestedStuffArticle includes the requested fields of the GraphQL type Article.
+type ComplexInlineFragmentsNestedStuffArticle struct {
+	Typename string `json:"__typename"`
+}
+
+// ComplexInlineFragmentsNestedStuffChildrenArticle includes the requested fields of the GraphQL type Article.
+type ComplexInlineFragmentsNestedStuffChildrenArticle struct {
+	Typename string `json:"__typename"`
+	// ID is the identifier of the content.
+	Id     testutil.ID                                          `json:"id"`
+	Text   string                                               `json:"text"`
+	Parent ComplexInlineFragmentsNestedStuffChildrenParentTopic `json:"parent"`
+}
+
+// ComplexInlineFragmentsNestedStuffChildrenContent includes the requested fields of the GraphQL interface Content.
+//
+// ComplexInlineFragmentsNestedStuffChildrenContent is implemented by the following types:
+// ComplexInlineFragmentsNestedStuffChildrenArticle
+// ComplexInlineFragmentsNestedStuffChildrenVideo
+// ComplexInlineFragmentsNestedStuffChildrenTopic
+//
+// The GraphQL type's documentation follows.
+//
+// Content is implemented by various types like Article, Video, and Topic.
+type ComplexInlineFragmentsNestedStuffChildrenContent interface {
+	implementsGraphQLInterfaceComplexInlineFragmentsNestedStuffChildrenContent()
+	// GetTypename returns the receiver's concrete GraphQL type-name (see interface doc for possible values).
+	GetTypename() string
+	// GetId returns the interface-field "id" from its implementation.
+	// The GraphQL interface field's documentation follows.
+	//
+	// ID is the identifier of the content.
+	GetId() testutil.ID
+}
+
+func (v *ComplexInlineFragmentsNestedStuffChildrenArticle) implementsGraphQLInterfaceComplexInlineFragmentsNestedStuffChildrenContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffChildrenContent.
+func (v *ComplexInlineFragmentsNestedStuffChildrenArticle) GetTypename() string { return v.Typename }
+
+// GetId is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffChildrenContent.
+func (v *ComplexInlineFragmentsNestedStuffChildrenArticle) GetId() testutil.ID { return v.Id }
+
+func (v *ComplexInlineFragmentsNestedStuffChildrenVideo) implementsGraphQLInterfaceComplexInlineFragmentsNestedStuffChildrenContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffChildrenContent.
+func (v *ComplexInlineFragmentsNestedStuffChildrenVideo) GetTypename() string { return v.Typename }
+
+// GetId is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffChildrenContent.
+func (v *ComplexInlineFragmentsNestedStuffChildrenVideo) GetId() testutil.ID { return v.Id }
+
+func (v *ComplexInlineFragmentsNestedStuffChildrenTopic) implementsGraphQLInterfaceComplexInlineFragmentsNestedStuffChildrenContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffChildrenContent.
+func (v *ComplexInlineFragmentsNestedStuffChildrenTopic) GetTypename() string { return v.Typename }
+
+// GetId is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffChildrenContent.
+func (v *ComplexInlineFragmentsNestedStuffChildrenTopic) GetId() testutil.ID { return v.Id }
+
+func __unmarshalComplexInlineFragmentsNestedStuffChildrenContent(v *ComplexInlineFragmentsNestedStuffChildrenContent, m json.RawMessage) error {
+	if string(m) == "null" {
+		return nil
+	}
+
+	var tn struct {
+		TypeName string `json:"__typename"`
+	}
+	err := json.Unmarshal(m, &tn)
+	if err != nil {
+		return err
+	}
+
+	switch tn.TypeName {
+	case "Article":
+		*v = new(ComplexInlineFragmentsNestedStuffChildrenArticle)
+		return json.Unmarshal(m, *v)
+	case "Video":
+		*v = new(ComplexInlineFragmentsNestedStuffChildrenVideo)
+		return json.Unmarshal(m, *v)
+	case "Topic":
+		*v = new(ComplexInlineFragmentsNestedStuffChildrenTopic)
+		return json.Unmarshal(m, *v)
+	default:
+		return fmt.Errorf(
+			`Unexpected concrete type for ComplexInlineFragmentsNestedStuffChildrenContent: "%v"`, tn.TypeName)
+	}
+}
+
+// ComplexInlineFragmentsNestedStuffChildrenParentTopic includes the requested fields of the GraphQL type Topic.
+type ComplexInlineFragmentsNestedStuffChildrenParentTopic struct {
+	Name   string                                                          `json:"name"`
+	Parent ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopic `json:"parent"`
+}
+
+// ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopic includes the requested fields of the GraphQL type Topic.
+type ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopic struct {
+	Children []ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent `json:"-"`
+}
+
+func (v *ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopic) UnmarshalJSON(b []byte) error {
+
+	type ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicWrapper ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopic
+
+	var firstPass struct {
+		*ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicWrapper
+		Children []json.RawMessage `json:"children"`
+	}
+	firstPass.ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicWrapper = (*ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicWrapper)(v)
+
+	err := json.Unmarshal(b, &firstPass)
+	if err != nil {
+		return err
+	}
+
+	{
+		target := &v.Children
+		raw := firstPass.Children
+		*target = make(
+			[]ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent,
+			len(raw))
+		for i, raw := range raw {
+			target := &(*target)[i]
+			err = __unmarshalComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent(
+				target, raw)
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenArticle includes the requested fields of the GraphQL type Article.
+type ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenArticle struct {
+	Typename string `json:"__typename"`
+	// ID is the identifier of the content.
+	Id   testutil.ID `json:"id"`
+	Name string      `json:"name"`
+}
+
+// ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent includes the requested fields of the GraphQL interface Content.
+//
+// ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent is implemented by the following types:
+// ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenArticle
+// ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenVideo
+// ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenTopic
+//
+// The GraphQL type's documentation follows.
+//
+// Content is implemented by various types like Article, Video, and Topic.
+type ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent interface {
+	implementsGraphQLInterfaceComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent()
+	// GetTypename returns the receiver's concrete GraphQL type-name (see interface doc for possible values).
+	GetTypename() string
+	// GetId returns the interface-field "id" from its implementation.
+	// The GraphQL interface field's documentation follows.
+	//
+	// ID is the identifier of the content.
+	GetId() testutil.ID
+	// GetName returns the interface-field "name" from its implementation.
+	GetName() string
+}
+
+func (v *ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenArticle) implementsGraphQLInterfaceComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent.
+func (v *ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenArticle) GetTypename() string {
+	return v.Typename
+}
+
+// GetId is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent.
+func (v *ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenArticle) GetId() testutil.ID {
+	return v.Id
+}
+
+// GetName is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent.
+func (v *ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenArticle) GetName() string {
+	return v.Name
+}
+
+func (v *ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenVideo) implementsGraphQLInterfaceComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent.
+func (v *ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenVideo) GetTypename() string {
+	return v.Typename
+}
+
+// GetId is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent.
+func (v *ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenVideo) GetId() testutil.ID {
+	return v.Id
+}
+
+// GetName is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent.
+func (v *ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenVideo) GetName() string {
+	return v.Name
+}
+
+func (v *ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenTopic) implementsGraphQLInterfaceComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent.
+func (v *ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenTopic) GetTypename() string {
+	return v.Typename
+}
+
+// GetId is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent.
+func (v *ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenTopic) GetId() testutil.ID {
+	return v.Id
+}
+
+// GetName is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent.
+func (v *ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenTopic) GetName() string {
+	return v.Name
+}
+
+func __unmarshalComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent(v *ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent, m json.RawMessage) error {
+	if string(m) == "null" {
+		return nil
+	}
+
+	var tn struct {
+		TypeName string `json:"__typename"`
+	}
+	err := json.Unmarshal(m, &tn)
+	if err != nil {
+		return err
+	}
+
+	switch tn.TypeName {
+	case "Article":
+		*v = new(ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenArticle)
+		return json.Unmarshal(m, *v)
+	case "Video":
+		*v = new(ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenVideo)
+		return json.Unmarshal(m, *v)
+	case "Topic":
+		*v = new(ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenTopic)
+		return json.Unmarshal(m, *v)
+	default:
+		return fmt.Errorf(
+			`Unexpected concrete type for ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenContent: "%v"`, tn.TypeName)
+	}
+}
+
+// ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenTopic includes the requested fields of the GraphQL type Topic.
+type ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenTopic struct {
+	Typename string `json:"__typename"`
+	// ID is the identifier of the content.
+	Id   testutil.ID `json:"id"`
+	Name string      `json:"name"`
+}
+
+// ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenVideo includes the requested fields of the GraphQL type Video.
+type ComplexInlineFragmentsNestedStuffChildrenParentTopicParentTopicChildrenVideo struct {
+	Typename string `json:"__typename"`
+	// ID is the identifier of the content.
+	Id   testutil.ID `json:"id"`
+	Name string      `json:"name"`
+}
+
+// ComplexInlineFragmentsNestedStuffChildrenTopic includes the requested fields of the GraphQL type Topic.
+type ComplexInlineFragmentsNestedStuffChildrenTopic struct {
+	Typename string `json:"__typename"`
+	// ID is the identifier of the content.
+	Id testutil.ID `json:"id"`
+}
+
+// ComplexInlineFragmentsNestedStuffChildrenVideo includes the requested fields of the GraphQL type Video.
+type ComplexInlineFragmentsNestedStuffChildrenVideo struct {
+	Typename string `json:"__typename"`
+	// ID is the identifier of the content.
+	Id testutil.ID `json:"id"`
+}
+
+// ComplexInlineFragmentsNestedStuffContent includes the requested fields of the GraphQL interface Content.
+//
+// ComplexInlineFragmentsNestedStuffContent is implemented by the following types:
+// ComplexInlineFragmentsNestedStuffArticle
+// ComplexInlineFragmentsNestedStuffVideo
+// ComplexInlineFragmentsNestedStuffTopic
+//
+// The GraphQL type's documentation follows.
+//
+// Content is implemented by various types like Article, Video, and Topic.
+type ComplexInlineFragmentsNestedStuffContent interface {
+	implementsGraphQLInterfaceComplexInlineFragmentsNestedStuffContent()
+	// GetTypename returns the receiver's concrete GraphQL type-name (see interface doc for possible values).
+	GetTypename() string
+}
+
+func (v *ComplexInlineFragmentsNestedStuffArticle) implementsGraphQLInterfaceComplexInlineFragmentsNestedStuffContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffContent.
+func (v *ComplexInlineFragmentsNestedStuffArticle) GetTypename() string { return v.Typename }
+
+func (v *ComplexInlineFragmentsNestedStuffVideo) implementsGraphQLInterfaceComplexInlineFragmentsNestedStuffContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffContent.
+func (v *ComplexInlineFragmentsNestedStuffVideo) GetTypename() string { return v.Typename }
+
+func (v *ComplexInlineFragmentsNestedStuffTopic) implementsGraphQLInterfaceComplexInlineFragmentsNestedStuffContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsNestedStuffContent.
+func (v *ComplexInlineFragmentsNestedStuffTopic) GetTypename() string { return v.Typename }
+
+func __unmarshalComplexInlineFragmentsNestedStuffContent(v *ComplexInlineFragmentsNestedStuffContent, m json.RawMessage) error {
+	if string(m) == "null" {
+		return nil
+	}
+
+	var tn struct {
+		TypeName string `json:"__typename"`
+	}
+	err := json.Unmarshal(m, &tn)
+	if err != nil {
+		return err
+	}
+
+	switch tn.TypeName {
+	case "Article":
+		*v = new(ComplexInlineFragmentsNestedStuffArticle)
+		return json.Unmarshal(m, *v)
+	case "Video":
+		*v = new(ComplexInlineFragmentsNestedStuffVideo)
+		return json.Unmarshal(m, *v)
+	case "Topic":
+		*v = new(ComplexInlineFragmentsNestedStuffTopic)
+		return json.Unmarshal(m, *v)
+	default:
+		return fmt.Errorf(
+			`Unexpected concrete type for ComplexInlineFragmentsNestedStuffContent: "%v"`, tn.TypeName)
+	}
+}
+
+// ComplexInlineFragmentsNestedStuffTopic includes the requested fields of the GraphQL type Topic.
+type ComplexInlineFragmentsNestedStuffTopic struct {
+	Typename string                                             `json:"__typename"`
+	Children []ComplexInlineFragmentsNestedStuffChildrenContent `json:"-"`
+}
+
+func (v *ComplexInlineFragmentsNestedStuffTopic) UnmarshalJSON(b []byte) error {
+
+	type ComplexInlineFragmentsNestedStuffTopicWrapper ComplexInlineFragmentsNestedStuffTopic
+
+	var firstPass struct {
+		*ComplexInlineFragmentsNestedStuffTopicWrapper
+		Children []json.RawMessage `json:"children"`
+	}
+	firstPass.ComplexInlineFragmentsNestedStuffTopicWrapper = (*ComplexInlineFragmentsNestedStuffTopicWrapper)(v)
+
+	err := json.Unmarshal(b, &firstPass)
+	if err != nil {
+		return err
+	}
+
+	{
+		target := &v.Children
+		raw := firstPass.Children
+		*target = make(
+			[]ComplexInlineFragmentsNestedStuffChildrenContent,
+			len(raw))
+		for i, raw := range raw {
+			target := &(*target)[i]
+			err = __unmarshalComplexInlineFragmentsNestedStuffChildrenContent(
+				target, raw)
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// ComplexInlineFragmentsNestedStuffVideo includes the requested fields of the GraphQL type Video.
+type ComplexInlineFragmentsNestedStuffVideo struct {
+	Typename string `json:"__typename"`
+}
+
+// ComplexInlineFragmentsRandomItemArticle includes the requested fields of the GraphQL type Article.
+type ComplexInlineFragmentsRandomItemArticle struct {
+	Typename string `json:"__typename"`
+	// ID is the identifier of the content.
+	Id   testutil.ID `json:"id"`
+	Text string      `json:"text"`
+	Name string      `json:"name"`
+}
+
+// ComplexInlineFragmentsRandomItemContent includes the requested fields of the GraphQL interface Content.
+//
+// ComplexInlineFragmentsRandomItemContent is implemented by the following types:
+// ComplexInlineFragmentsRandomItemArticle
+// ComplexInlineFragmentsRandomItemVideo
+// ComplexInlineFragmentsRandomItemTopic
+//
+// The GraphQL type's documentation follows.
+//
+// Content is implemented by various types like Article, Video, and Topic.
+type ComplexInlineFragmentsRandomItemContent interface {
+	implementsGraphQLInterfaceComplexInlineFragmentsRandomItemContent()
+	// GetTypename returns the receiver's concrete GraphQL type-name (see interface doc for possible values).
+	GetTypename() string
+	// GetId returns the interface-field "id" from its implementation.
+	// The GraphQL interface field's documentation follows.
+	//
+	// ID is the identifier of the content.
+	GetId() testutil.ID
+	// GetName returns the interface-field "name" from its implementation.
+	GetName() string
+}
+
+func (v *ComplexInlineFragmentsRandomItemArticle) implementsGraphQLInterfaceComplexInlineFragmentsRandomItemContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsRandomItemContent.
+func (v *ComplexInlineFragmentsRandomItemArticle) GetTypename() string { return v.Typename }
+
+// GetId is a part of, and documented with, the interface ComplexInlineFragmentsRandomItemContent.
+func (v *ComplexInlineFragmentsRandomItemArticle) GetId() testutil.ID { return v.Id }
+
+// GetName is a part of, and documented with, the interface ComplexInlineFragmentsRandomItemContent.
+func (v *ComplexInlineFragmentsRandomItemArticle) GetName() string { return v.Name }
+
+func (v *ComplexInlineFragmentsRandomItemVideo) implementsGraphQLInterfaceComplexInlineFragmentsRandomItemContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsRandomItemContent.
+func (v *ComplexInlineFragmentsRandomItemVideo) GetTypename() string { return v.Typename }
+
+// GetId is a part of, and documented with, the interface ComplexInlineFragmentsRandomItemContent.
+func (v *ComplexInlineFragmentsRandomItemVideo) GetId() testutil.ID { return v.Id }
+
+// GetName is a part of, and documented with, the interface ComplexInlineFragmentsRandomItemContent.
+func (v *ComplexInlineFragmentsRandomItemVideo) GetName() string { return v.Name }
+
+func (v *ComplexInlineFragmentsRandomItemTopic) implementsGraphQLInterfaceComplexInlineFragmentsRandomItemContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsRandomItemContent.
+func (v *ComplexInlineFragmentsRandomItemTopic) GetTypename() string { return v.Typename }
+
+// GetId is a part of, and documented with, the interface ComplexInlineFragmentsRandomItemContent.
+func (v *ComplexInlineFragmentsRandomItemTopic) GetId() testutil.ID { return v.Id }
+
+// GetName is a part of, and documented with, the interface ComplexInlineFragmentsRandomItemContent.
+func (v *ComplexInlineFragmentsRandomItemTopic) GetName() string { return v.Name }
+
+func __unmarshalComplexInlineFragmentsRandomItemContent(v *ComplexInlineFragmentsRandomItemContent, m json.RawMessage) error {
+	if string(m) == "null" {
+		return nil
+	}
+
+	var tn struct {
+		TypeName string `json:"__typename"`
+	}
+	err := json.Unmarshal(m, &tn)
+	if err != nil {
+		return err
+	}
+
+	switch tn.TypeName {
+	case "Article":
+		*v = new(ComplexInlineFragmentsRandomItemArticle)
+		return json.Unmarshal(m, *v)
+	case "Video":
+		*v = new(ComplexInlineFragmentsRandomItemVideo)
+		return json.Unmarshal(m, *v)
+	case "Topic":
+		*v = new(ComplexInlineFragmentsRandomItemTopic)
+		return json.Unmarshal(m, *v)
+	default:
+		return fmt.Errorf(
+			`Unexpected concrete type for ComplexInlineFragmentsRandomItemContent: "%v"`, tn.TypeName)
+	}
+}
+
+// ComplexInlineFragmentsRandomItemTopic includes the requested fields of the GraphQL type Topic.
+type ComplexInlineFragmentsRandomItemTopic struct {
+	Typename string `json:"__typename"`
+	// ID is the identifier of the content.
+	Id   testutil.ID `json:"id"`
+	Name string      `json:"name"`
+}
+
+// ComplexInlineFragmentsRandomItemVideo includes the requested fields of the GraphQL type Video.
+type ComplexInlineFragmentsRandomItemVideo struct {
+	Typename string `json:"__typename"`
+	// ID is the identifier of the content.
+	Id       testutil.ID `json:"id"`
+	Name     string      `json:"name"`
+	Duration int         `json:"duration"`
+}
+
+// ComplexInlineFragmentsRepeatedStuffArticle includes the requested fields of the GraphQL type Article.
+type ComplexInlineFragmentsRepeatedStuffArticle struct {
+	Typename string `json:"__typename"`
+	// ID is the identifier of the content.
+	Id  testutil.ID `json:"id"`
+	Url string      `json:"url"`
+	// ID is the identifier of the content.
+	OtherId   testutil.ID `json:"otherId"`
+	Name      string      `json:"name"`
+	Text      string      `json:"text"`
+	OtherName string      `json:"otherName"`
+}
+
+// ComplexInlineFragmentsRepeatedStuffContent includes the requested fields of the GraphQL interface Content.
+//
+// ComplexInlineFragmentsRepeatedStuffContent is implemented by the following types:
+// ComplexInlineFragmentsRepeatedStuffArticle
+// ComplexInlineFragmentsRepeatedStuffVideo
+// ComplexInlineFragmentsRepeatedStuffTopic
+//
+// The GraphQL type's documentation follows.
+//
+// Content is implemented by various types like Article, Video, and Topic.
+type ComplexInlineFragmentsRepeatedStuffContent interface {
+	implementsGraphQLInterfaceComplexInlineFragmentsRepeatedStuffContent()
+	// GetTypename returns the receiver's concrete GraphQL type-name (see interface doc for possible values).
+	GetTypename() string
+	// GetId returns the interface-field "id" from its implementation.
+	// The GraphQL interface field's documentation follows.
+	//
+	// ID is the identifier of the content.
+	GetId() testutil.ID
+	// GetUrl returns the interface-field "url" from its implementation.
+	GetUrl() string
+	// GetOtherId returns the interface-field "id" from its implementation.
+	// The GraphQL interface field's documentation follows.
+	//
+	// ID is the identifier of the content.
+	GetOtherId() testutil.ID
+	// GetName returns the interface-field "name" from its implementation.
+	GetName() string
+	// GetOtherName returns the interface-field "name" from its implementation.
+	GetOtherName() string
+}
+
+func (v *ComplexInlineFragmentsRepeatedStuffArticle) implementsGraphQLInterfaceComplexInlineFragmentsRepeatedStuffContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffArticle) GetTypename() string { return v.Typename }
+
+// GetId is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffArticle) GetId() testutil.ID { return v.Id }
+
+// GetUrl is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffArticle) GetUrl() string { return v.Url }
+
+// GetOtherId is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffArticle) GetOtherId() testutil.ID { return v.OtherId }
+
+// GetName is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffArticle) GetName() string { return v.Name }
+
+// GetOtherName is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffArticle) GetOtherName() string { return v.OtherName }
+
+func (v *ComplexInlineFragmentsRepeatedStuffVideo) implementsGraphQLInterfaceComplexInlineFragmentsRepeatedStuffContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffVideo) GetTypename() string { return v.Typename }
+
+// GetId is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffVideo) GetId() testutil.ID { return v.Id }
+
+// GetUrl is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffVideo) GetUrl() string { return v.Url }
+
+// GetOtherId is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffVideo) GetOtherId() testutil.ID { return v.OtherId }
+
+// GetName is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffVideo) GetName() string { return v.Name }
+
+// GetOtherName is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffVideo) GetOtherName() string { return v.OtherName }
+
+func (v *ComplexInlineFragmentsRepeatedStuffTopic) implementsGraphQLInterfaceComplexInlineFragmentsRepeatedStuffContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffTopic) GetTypename() string { return v.Typename }
+
+// GetId is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffTopic) GetId() testutil.ID { return v.Id }
+
+// GetUrl is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffTopic) GetUrl() string { return v.Url }
+
+// GetOtherId is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffTopic) GetOtherId() testutil.ID { return v.OtherId }
+
+// GetName is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffTopic) GetName() string { return v.Name }
+
+// GetOtherName is a part of, and documented with, the interface ComplexInlineFragmentsRepeatedStuffContent.
+func (v *ComplexInlineFragmentsRepeatedStuffTopic) GetOtherName() string { return v.OtherName }
+
+func __unmarshalComplexInlineFragmentsRepeatedStuffContent(v *ComplexInlineFragmentsRepeatedStuffContent, m json.RawMessage) error {
+	if string(m) == "null" {
+		return nil
+	}
+
+	var tn struct {
+		TypeName string `json:"__typename"`
+	}
+	err := json.Unmarshal(m, &tn)
+	if err != nil {
+		return err
+	}
+
+	switch tn.TypeName {
+	case "Article":
+		*v = new(ComplexInlineFragmentsRepeatedStuffArticle)
+		return json.Unmarshal(m, *v)
+	case "Video":
+		*v = new(ComplexInlineFragmentsRepeatedStuffVideo)
+		return json.Unmarshal(m, *v)
+	case "Topic":
+		*v = new(ComplexInlineFragmentsRepeatedStuffTopic)
+		return json.Unmarshal(m, *v)
+	default:
+		return fmt.Errorf(
+			`Unexpected concrete type for ComplexInlineFragmentsRepeatedStuffContent: "%v"`, tn.TypeName)
+	}
+}
+
+// ComplexInlineFragmentsRepeatedStuffTopic includes the requested fields of the GraphQL type Topic.
+type ComplexInlineFragmentsRepeatedStuffTopic struct {
+	Typename string `json:"__typename"`
+	// ID is the identifier of the content.
+	Id  testutil.ID `json:"id"`
+	Url string      `json:"url"`
+	// ID is the identifier of the content.
+	OtherId   testutil.ID `json:"otherId"`
+	Name      string      `json:"name"`
+	OtherName string      `json:"otherName"`
+}
+
+// ComplexInlineFragmentsRepeatedStuffVideo includes the requested fields of the GraphQL type Video.
+type ComplexInlineFragmentsRepeatedStuffVideo struct {
+	Typename string `json:"__typename"`
+	// ID is the identifier of the content.
+	Id  testutil.ID `json:"id"`
+	Url string      `json:"url"`
+	// ID is the identifier of the content.
+	OtherId   testutil.ID `json:"otherId"`
+	Name      string      `json:"name"`
+	OtherName string      `json:"otherName"`
+	Duration  int         `json:"duration"`
+}
+
+// ComplexInlineFragmentsResponse is returned by ComplexInlineFragments on success.
+type ComplexInlineFragmentsResponse struct {
+	Root             ComplexInlineFragmentsRootTopic               `json:"root"`
+	RandomItem       ComplexInlineFragmentsRandomItemContent       `json:"-"`
+	RepeatedStuff    ComplexInlineFragmentsRepeatedStuffContent    `json:"-"`
+	ConflictingStuff ComplexInlineFragmentsConflictingStuffContent `json:"-"`
+	NestedStuff      ComplexInlineFragmentsNestedStuffContent      `json:"-"`
+}
+
+func (v *ComplexInlineFragmentsResponse) UnmarshalJSON(b []byte) error {
+
+	type ComplexInlineFragmentsResponseWrapper ComplexInlineFragmentsResponse
+
+	var firstPass struct {
+		*ComplexInlineFragmentsResponseWrapper
+		RandomItem       json.RawMessage `json:"randomItem"`
+		RepeatedStuff    json.RawMessage `json:"repeatedStuff"`
+		ConflictingStuff json.RawMessage `json:"conflictingStuff"`
+		NestedStuff      json.RawMessage `json:"nestedStuff"`
+	}
+	firstPass.ComplexInlineFragmentsResponseWrapper = (*ComplexInlineFragmentsResponseWrapper)(v)
+
+	err := json.Unmarshal(b, &firstPass)
+	if err != nil {
+		return err
+	}
+
+	{
+		target := &v.RandomItem
+		raw := firstPass.RandomItem
+		err = __unmarshalComplexInlineFragmentsRandomItemContent(
+			target, raw)
+		if err != nil {
+			return err
+		}
+	}
+	{
+		target := &v.RepeatedStuff
+		raw := firstPass.RepeatedStuff
+		err = __unmarshalComplexInlineFragmentsRepeatedStuffContent(
+			target, raw)
+		if err != nil {
+			return err
+		}
+	}
+	{
+		target := &v.ConflictingStuff
+		raw := firstPass.ConflictingStuff
+		err = __unmarshalComplexInlineFragmentsConflictingStuffContent(
+			target, raw)
+		if err != nil {
+			return err
+		}
+	}
+	{
+		target := &v.NestedStuff
+		raw := firstPass.NestedStuff
+		err = __unmarshalComplexInlineFragmentsNestedStuffContent(
+			target, raw)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// ComplexInlineFragmentsRootTopic includes the requested fields of the GraphQL type Topic.
+type ComplexInlineFragmentsRootTopic struct {
+	// ID is documented in the Content interface.
+	Id          testutil.ID `json:"id"`
+	SchoolGrade string      `json:"schoolGrade"`
+	Name        string      `json:"name"`
+}
+
+// We test all the spread cases from DESIGN.md, see there for more context on
+// each, as well as various other nonsense.  But for abstract-in-abstract
+// spreads, we can't test cases (4b) and (4c), where I implements J or vice
+// versa, because gqlparser doesn't support interfaces that implement other
+// interfaces yet.
+func ComplexInlineFragments(
+	client graphql.Client,
+) (*ComplexInlineFragmentsResponse, error) {
+	var retval ComplexInlineFragmentsResponse
+	err := client.MakeRequest(
+		nil,
+		"ComplexInlineFragments",
+		`
+query ComplexInlineFragments {
+	root {
+		id
+		... on Topic {
+			schoolGrade
+		}
+		... on Content {
+			name
+		}
+	}
+	randomItem {
+		__typename
+		id
+		... on Article {
+			text
+		}
+		... on Content {
+			name
+		}
+		... on HasDuration {
+			duration
+		}
+	}
+	repeatedStuff: randomItem {
+		__typename
+		id
+		id
+		url
+		otherId: id
+		... on Article {
+			name
+			text
+			otherName: name
+		}
+		... on Content {
+			id
+			name
+			otherName: name
+		}
+		... on HasDuration {
+			duration
+		}
+	}
+	conflictingStuff: randomItem {
+		__typename
+		... on Article {
+			thumbnail {
+				id
+				thumbnailUrl
+			}
+		}
+		... on Video {
+			thumbnail {
+				id
+				timestampSec
+			}
+		}
+	}
+	nestedStuff: randomItem {
+		__typename
+		... on Topic {
+			children {
+				__typename
+				id
+				... on Article {
+					text
+					parent {
+						... on Content {
+							name
+							parent {
+								... on Topic {
+									children {
+										__typename
+										id
+										name
+									}
+								}
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+}
+`,
+		&retval,
+		nil,
+	)
+	return &retval, err
+}
+

generate/testdata/snapshots/TestGenerate-ComplexInlineFragments.graphql-ComplexInlineFragments.graphql.json

@@ -0,0 +1,9 @@
+{
+  "operations": [
+    {
+      "operationName": "ComplexInlineFragments",
+      "query": "\nquery ComplexInlineFragments {\n\troot {\n\t\tid\n\t\t... on Topic {\n\t\t\tschoolGrade\n\t\t}\n\t\t... on Content {\n\t\t\tname\n\t\t}\n\t}\n\trandomItem {\n\t\t__typename\n\t\tid\n\t\t... on Article {\n\t\t\ttext\n\t\t}\n\t\t... on Content {\n\t\t\tname\n\t\t}\n\t\t... on HasDuration {\n\t\t\tduration\n\t\t}\n\t}\n\trepeatedStuff: randomItem {\n\t\t__typename\n\t\tid\n\t\tid\n\t\turl\n\t\totherId: id\n\t\t... on Article {\n\t\t\tname\n\t\t\ttext\n\t\t\totherName: name\n\t\t}\n\t\t... on Content {\n\t\t\tid\n\t\t\tname\n\t\t\totherName: name\n\t\t}\n\t\t... on HasDuration {\n\t\t\tduration\n\t\t}\n\t}\n\tconflictingStuff: randomItem {\n\t\t__typename\n\t\t... on Article {\n\t\t\tthumbnail {\n\t\t\t\tid\n\t\t\t\tthumbnailUrl\n\t\t\t}\n\t\t}\n\t\t... on Video {\n\t\t\tthumbnail {\n\t\t\t\tid\n\t\t\t\ttimestampSec\n\t\t\t}\n\t\t}\n\t}\n\tnestedStuff: randomItem {\n\t\t__typename\n\t\t... on Topic {\n\t\t\tchildren {\n\t\t\t\t__typename\n\t\t\t\tid\n\t\t\t\t... on Article {\n\t\t\t\t\ttext\n\t\t\t\t\tparent {\n\t\t\t\t\t\t... on Content {\n\t\t\t\t\t\t\tname\n\t\t\t\t\t\t\tparent {\n\t\t\t\t\t\t\t\t... on Topic {\n\t\t\t\t\t\t\t\t\tchildren {\n\t\t\t\t\t\t\t\t\t\t__typename\n\t\t\t\t\t\t\t\t\t\tid\n\t\t\t\t\t\t\t\t\t\tname\n\t\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n}\n",
+      "sourceLocation": "testdata/queries/ComplexInlineFragments.graphql"
+    }
+  ]
+}

generate/testdata/snapshots/TestGenerate-SimpleInlineFragment.graphql-SimpleInlineFragment.graphql.go

@@ -0,0 +1,186 @@
+package test
+
+// Code generated by github.com/Khan/genqlient, DO NOT EDIT.
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/Khan/genqlient/graphql"
+	"github.com/Khan/genqlient/internal/testutil"
+)
+
+// SimpleInlineFragmentRandomItemArticle includes the requested fields of the GraphQL type Article.
+type SimpleInlineFragmentRandomItemArticle struct {
+	Typename string `json:"__typename"`
+	// ID is the identifier of the content.
+	Id   testutil.ID `json:"id"`
+	Name string      `json:"name"`
+	Text string      `json:"text"`
+}
+
+// SimpleInlineFragmentRandomItemContent includes the requested fields of the GraphQL interface Content.
+//
+// SimpleInlineFragmentRandomItemContent is implemented by the following types:
+// SimpleInlineFragmentRandomItemArticle
+// SimpleInlineFragmentRandomItemVideo
+// SimpleInlineFragmentRandomItemTopic
+//
+// The GraphQL type's documentation follows.
+//
+// Content is implemented by various types like Article, Video, and Topic.
+type SimpleInlineFragmentRandomItemContent interface {
+	implementsGraphQLInterfaceSimpleInlineFragmentRandomItemContent()
+	// GetTypename returns the receiver's concrete GraphQL type-name (see interface doc for possible values).
+	GetTypename() string
+	// GetId returns the interface-field "id" from its implementation.
+	// The GraphQL interface field's documentation follows.
+	//
+	// ID is the identifier of the content.
+	GetId() testutil.ID
+	// GetName returns the interface-field "name" from its implementation.
+	GetName() string
+}
+
+func (v *SimpleInlineFragmentRandomItemArticle) implementsGraphQLInterfaceSimpleInlineFragmentRandomItemContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface SimpleInlineFragmentRandomItemContent.
+func (v *SimpleInlineFragmentRandomItemArticle) GetTypename() string { return v.Typename }
+
+// GetId is a part of, and documented with, the interface SimpleInlineFragmentRandomItemContent.
+func (v *SimpleInlineFragmentRandomItemArticle) GetId() testutil.ID { return v.Id }
+
+// GetName is a part of, and documented with, the interface SimpleInlineFragmentRandomItemContent.
+func (v *SimpleInlineFragmentRandomItemArticle) GetName() string { return v.Name }
+
+func (v *SimpleInlineFragmentRandomItemVideo) implementsGraphQLInterfaceSimpleInlineFragmentRandomItemContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface SimpleInlineFragmentRandomItemContent.
+func (v *SimpleInlineFragmentRandomItemVideo) GetTypename() string { return v.Typename }
+
+// GetId is a part of, and documented with, the interface SimpleInlineFragmentRandomItemContent.
+func (v *SimpleInlineFragmentRandomItemVideo) GetId() testutil.ID { return v.Id }
+
+// GetName is a part of, and documented with, the interface SimpleInlineFragmentRandomItemContent.
+func (v *SimpleInlineFragmentRandomItemVideo) GetName() string { return v.Name }
+
+func (v *SimpleInlineFragmentRandomItemTopic) implementsGraphQLInterfaceSimpleInlineFragmentRandomItemContent() {
+}
+
+// GetTypename is a part of, and documented with, the interface SimpleInlineFragmentRandomItemContent.
+func (v *SimpleInlineFragmentRandomItemTopic) GetTypename() string { return v.Typename }
+
+// GetId is a part of, and documented with, the interface SimpleInlineFragmentRandomItemContent.
+func (v *SimpleInlineFragmentRandomItemTopic) GetId() testutil.ID { return v.Id }
+
+// GetName is a part of, and documented with, the interface SimpleInlineFragmentRandomItemContent.
+func (v *SimpleInlineFragmentRandomItemTopic) GetName() string { return v.Name }
+
+func __unmarshalSimpleInlineFragmentRandomItemContent(v *SimpleInlineFragmentRandomItemContent, m json.RawMessage) error {
+	if string(m) == "null" {
+		return nil
+	}
+
+	var tn struct {
+		TypeName string `json:"__typename"`
+	}
+	err := json.Unmarshal(m, &tn)
+	if err != nil {
+		return err
+	}
+
+	switch tn.TypeName {
+	case "Article":
+		*v = new(SimpleInlineFragmentRandomItemArticle)
+		return json.Unmarshal(m, *v)
+	case "Video":
+		*v = new(SimpleInlineFragmentRandomItemVideo)
+		return json.Unmarshal(m, *v)
+	case "Topic":
+		*v = new(SimpleInlineFragmentRandomItemTopic)
+		return json.Unmarshal(m, *v)
+	default:
+		return fmt.Errorf(
+			`Unexpected concrete type for SimpleInlineFragmentRandomItemContent: "%v"`, tn.TypeName)
+	}
+}
+
+// SimpleInlineFragmentRandomItemTopic includes the requested fields of the GraphQL type Topic.
+type SimpleInlineFragmentRandomItemTopic struct {
+	Typename string `json:"__typename"`
+	// ID is the identifier of the content.
+	Id   testutil.ID `json:"id"`
+	Name string      `json:"name"`
+}
+
+// SimpleInlineFragmentRandomItemVideo includes the requested fields of the GraphQL type Video.
+type SimpleInlineFragmentRandomItemVideo struct {
+	Typename string `json:"__typename"`
+	// ID is the identifier of the content.
+	Id       testutil.ID `json:"id"`
+	Name     string      `json:"name"`
+	Duration int         `json:"duration"`
+}
+
+// SimpleInlineFragmentResponse is returned by SimpleInlineFragment on success.
+type SimpleInlineFragmentResponse struct {
+	RandomItem SimpleInlineFragmentRandomItemContent `json:"-"`
+}
+
+func (v *SimpleInlineFragmentResponse) UnmarshalJSON(b []byte) error {
+
+	type SimpleInlineFragmentResponseWrapper SimpleInlineFragmentResponse
+
+	var firstPass struct {
+		*SimpleInlineFragmentResponseWrapper
+		RandomItem json.RawMessage `json:"randomItem"`
+	}
+	firstPass.SimpleInlineFragmentResponseWrapper = (*SimpleInlineFragmentResponseWrapper)(v)
+
+	err := json.Unmarshal(b, &firstPass)
+	if err != nil {
+		return err
+	}
+
+	{
+		target := &v.RandomItem
+		raw := firstPass.RandomItem
+		err = __unmarshalSimpleInlineFragmentRandomItemContent(
+			target, raw)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func SimpleInlineFragment(
+	client graphql.Client,
+) (*SimpleInlineFragmentResponse, error) {
+	var retval SimpleInlineFragmentResponse
+	err := client.MakeRequest(
+		nil,
+		"SimpleInlineFragment",
+		`
+query SimpleInlineFragment {
+	randomItem {
+		__typename
+		id
+		name
+		... on Article {
+			text
+		}
+		... on Video {
+			duration
+		}
+	}
+}
+`,
+		&retval,
+		nil,
+	)
+	return &retval, err
+}
+

generate/testdata/snapshots/TestGenerate-SimpleInlineFragment.graphql-SimpleInlineFragment.graphql.json

@@ -0,0 +1,9 @@
+{
+  "operations": [
+    {
+      "operationName": "SimpleInlineFragment",
+      "query": "\nquery SimpleInlineFragment {\n\trandomItem {\n\t\t__typename\n\t\tid\n\t\tname\n\t\t... on Article {\n\t\t\ttext\n\t\t}\n\t\t... on Video {\n\t\t\tduration\n\t\t}\n\t}\n}\n",
+      "sourceLocation": "testdata/queries/SimpleInlineFragment.graphql"
+    }
+  ]
+}

generate/testdata/snapshots/TestGenerateErrors-ConflictingSelections.go

@@ -0,0 +1 @@
+testdata/errors/ConflictingSelections.go:4: operations must have operation-names

generate/testdata/snapshots/TestGenerateErrors-ConflictingSelections.graphql

@@ -0,0 +1 @@
+testdata/errors/ConflictingSelections.graphql:1: operations must have operation-names