如何在Union中查询具有不同类型的相同字段? [英] How to query same field with different types in an Union?

问题描述

我有以下型号

type Duck {
    category: Baz
}

type Foo {
    size: FooSize
}

type Bar {
    size: BarSize
}

union Baz = Foo | Bar

以下查询引发错误 FieldsConflict类型的验证错误:size:它们返回不同的类型FooSize和BarSize @'duck/category'(这是此处所述的预期行为: https://github.com/graphql/graphql-js/issues/53 )

The following query throws an error Validation error of type FieldsConflict: size: they return differing types FooSize and BarSize @ 'duck/category' (it's an intended behaviour as stated here : https://github.com/graphql/graphql-js/issues/53)

{
  duck {
    category {
      ... on Foo {
        size
      }
      ... on Bar {
        size
      }
    }
  }
}

大小为 的别名将使查询正常工作，但是我不能在这里使用它们，因为查询结果将被传递回另一个期望 Duck.category 并具有一个名为 size 的键.

Aliases on size would make the query work, but I can't use them here, because the query results will be passed back to another API which expect Duck.category to have a key named exactly size.

我可以在这里使用任何替代方法或架构重构来使它正常工作吗?

Is there any workaround, or schema refactoring I could use here to get this working ?

推荐答案

总的来说，您只能做三件事来解决该错误:

At a high level, you can only do three things to resolve that error:

• 重构架构，以使 size 字段是两种类型的相同类型.
• 别名一个或两个字段.
• 仅请求字段提供一种类型.

• Refactor the schema so that the size field is the same type for both types.
• Alias one or both fields.
• Only request the field for one of the types.

如果您需要将响应传递给另一个API，最简单的方法是使用别名，然后在将响应发送到API之前转换客户端的响应.

If you need to pass the response to another API, the easiest thing would be to use aliases and then transform the response client-side before sending it to the API.

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