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Unions that list each other fail with a StackOverflowError

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维护者通常 1 天内回复

还没有人认领这个 Issue。

评估

难度
3/5
预计耗时
1-2 天
新手友好度
55/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
活跃
技术栈
graphql, kotlin
领域
api, backend

调研方向

Start by reading SchemaParser#getLeafUnionObjects and trace how nested union members are expanded; the issue identifies the recursive expansion as the source of the StackOverflowError. Reproduce with the mutual and self-referencing schemas shown in the issue, including a field that returns the inner union. Done when those schemas no longer overflow and the invalid union membership is handled consistently with the chosen behavior.

由索引模型根据 Issue 内容生成。

描述

bug

Two unions that list each other fail the schema build with a StackOverflowError:

type Query {
    results: [Result!]!
}

union Result = Book | Media

union Media = Movie | Result

Same for a union that lists itself (union Result = Book | Result).

SchemaParser#getLeafUnionObjects expands nested unions recursively and doesn't keep track of the ones it already expanded. On master this only happens when some field returns the inner union, or for the self-member case. Otherwise the scanner fails first with "No object type found". After #866 the scanner gets past that, so the first schema above overflows too.

The spec doesn't allow unions as members at all, so I think either flattening each union once (both would be Book | Movie) or failing with an error that names the unions is fine. Probably the error, since nobody asked for cycles.

主要语言
Kotlin
星标
824
派生
175
平均合并
2 天 5 小时
30 天内合并 PR
52

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