[Fusion] Coerce single element value for list variable - #9750
#9750Merged
tobias-tengler merged 1 commit intoMay 20, 2026
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[Fusion] Coerce single element value for list variable#9750tobias-tengler merged 1 commit intomainChilliCream/graphql-platform:mainfrom tte/fix-fusion-variable-coercionChilliCream/graphql-platform:tte/fix-fusion-variable-coercionCopy head branch name to clipboard
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Pull request overview
This PR updates Fusion’s JSON variable coercion to follow the GraphQL spec’s List Input Coercion rule by allowing a non-list JSON value to be treated as a single-element list when the variable type is a list (fixing the behavior reported in #9749).
Changes:
- Update Fusion list-variable coercion to wrap non-array JSON values into a single-item
ListValueNode. - Add Fusion tests covering single-value-to-list coercion and related error cases.
- Add a matching core execution test asserting the error shape when a single value cannot be coerced to the list element type.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
src/HotChocolate/Fusion/src/Fusion.Execution/Execution/JsonVariableCoercion.cs |
Implements single-value → single-item-list coercion for list-typed variables. |
src/HotChocolate/Fusion/test/Fusion.Execution.Tests/Execution/VariableCoercionHelperTests.cs |
Adds Fusion test coverage for list coercion and error reporting. |
src/HotChocolate/Core/test/Execution.Tests/Processing/VariableCoercionHelperTests.cs |
Adds core test coverage for the error produced when the single value doesn’t match the list element type. |
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Closes #9749