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Add support for interfaces, part 3: automatically add __typename (#56)

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## Summary:
In #52, I added support for interface types, but with the simplifying
restriction (among others) that the user must request the field
`__typename`.  In this commit, I remove this restriction.

The basic idea is simple: we preprocess the query to add `__typename`.
The implementation isn't much more complicated!  Although it required
some new wiring in a few places.

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/56
This commit is contained in:
Ben Kraft
2021-08-25 11:59:45 -07:00
committed by GitHub
parent 1e87553788
commit 65f9e90f2b
16 changed files with 189 additions and 62 deletions
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generate/testdata/snapshots/TestGenerate-InterfaceNesting.graphql-InterfaceNesting.graphql.json
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+1 -1
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@@ -2,7 +2,7 @@
"operations": [
{
"operationName": "InterfaceNesting",
"query": "\nquery InterfaceNesting {\n\troot {\n\t\tid\n\t\tchildren {\n\t\t\t__typename\n\t\t\tid\n\t\t\tparent {\n\t\t\t\t__typename\n\t\t\t\tid\n\t\t\t\tchildren {\n\t\t\t\t\t__typename\n\t\t\t\t\tid\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n}\n",
"query": "\nquery InterfaceNesting {\n\troot {\n\t\tid\n\t\tchildren {\n\t\t\t__typename\n\t\t\tid\n\t\t\tparent {\n\t\t\t\tid\n\t\t\t\tchildren {\n\t\t\t\t\t__typename\n\t\t\t\t\tid\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n}\n",
"sourceLocation": "testdata/queries/InterfaceNesting.graphql"
}
]