fix(api): handle enum casting in GraphQLSelectionSet snapshot

[Take111]

Issue #

#3953

Related PR in amplify-codegen: aws-amplify/amplify-codegen#991

Description

GraphQL responses with enum fields store raw String values in the snapshot dictionary, but codegen-generated property accessors cast directly (e.g. snapshot["status"]! as! PostStatus), causing a crash.

Add convertFieldValues/convertValue helpers to GraphQLSelectionSet that use GraphQLField.type metadata to convert scalar values via JSONDecodable.init(jsonValue:), leveraging the existing RawRepresentable extension for String-to-Enum conversion.

General Checklist

• Added new tests to cover change, if needed
• Build succeeds with all target using Swift Package Manager
• All unit tests pass
• All integration tests pass
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Documentation update for the change if required
• PR title conforms to conventional commit style
• New or updated tests include Given When Then inline code documentation and are named accordingly testThing_condition_expectation()
• If breaking change, documentation/changelog update with migration instructions

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[Copilot]

Pull request overview

Updates the APISwift compatibility fixtures/tests to ensure GraphQL response decoding converts enum raw String values into the expected generated enum types (avoiding runtime as! Enum cast crashes), aligned with the referenced amplify-codegen change.

Changes:

• Add convertFieldValues / convertValue helpers to GraphQLSelectionSet.init(from:) to coerce scalar snapshot values using GraphQLField.type metadata (including enums via JSONDecodable).
• Add unit tests validating enum decoding for non-optional, optional, null, nested-list, and unknown enum cases.
• Apply the same GraphQLSelectionSet snapshot conversion behavior across the APIHostApp generated API.swift fixtures.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
AmplifyPlugins/API/Tests/AWSAPIPluginTests/APISwiftCompatibility/APISwiftTests.swift	Adds coverage for enum decoding behavior (including unknown/null/nested list cases).
AmplifyPlugins/API/Tests/AWSAPIPluginTests/APISwiftCompatibility/API.swift	Enhances GraphQLSelectionSet decoding to convert scalar values (incl. enums) based on selection metadata; adds test-only enum/query types used by the new tests.
AmplifyPlugins/API/Tests/APIHostApp/AWSAPIPluginGraphQLUserPoolTests/API.swift	Mirrors the updated GraphQLSelectionSet decoding conversion logic in host app fixture.
AmplifyPlugins/API/Tests/APIHostApp/AWSAPIPluginGraphQLIAMTests/API.swift	Mirrors the updated GraphQLSelectionSet decoding conversion logic in host app fixture.
AmplifyPlugins/API/Tests/APIHostApp/AWSAPIPluginFunctionalTests/API.swift	Mirrors the updated GraphQLSelectionSet decoding conversion logic in host app fixture.

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[cadivus]

Hi @Take111,

Thank you for your contribution to the AWS Amplify Library! Our team will review your PR and provide feedback soon.