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Unions that list each other fail with a StackOverflowError

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#886 0 則留言 0 個 reaction 已指派 0 人 在 GitHub 檢視

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還沒有人認領這個 Issue。

評估

難度
3/5
預估耗時
1-2 天
新手友好度
55/100
Issue 類型
缺陷
描述清晰度
基本清楚
活躍度
活躍
技術堆疊
graphql, kotlin
領域
api, backend

研究方向

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.

由索引模型根據 Issue 內容生成。

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.

主要語言
Kotlin
星號
824
分支
175
平均合併
2 天 5 小時
30 天內合併 PR
52

環境準備

這個專案沒有提供開發容器、Dockerfile 或貢獻指南,環境需要你自己搭建:先看它的 README,通用步驟見我們的新手貢獻指南。

從這裡開始

  1. 先讀完整個 Issue,再讀專案的貢獻指南。
  2. 在 Issue 下留言說明你要接手 —— 這能避免兩個人做同樣的事。
  3. Fork 儲存庫,在一個分支上完成修改。
  4. 送出 Pull Request,並在描述裡引用這個 Issue 編號。

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