GraphQL - 在联合中使用不同类型的相同字段名称 [英] GraphQL - Using same field names in different types within union

问题描述

如果我有这样的联合类型:

If I have a union type like this:

union AllOnboardingQuestionTypes = StepFinal | TimeRangesQuestion | PercentQuestion | SingleSelectQuestion | MultiSelectQuestion | InformationOnly

其中某些类型具有相同的字段名称但类型不同(例如，PercentAnswer 的答案是 float 而 SingleSelect 的答案是 string)，这是进行查询的正确方法吗?

where some of the types have the same field names but different types (e.g. answer for PercentAnswer is float whereas SingleSelect's answer is a string), is this the right way to do the query?

query OnboardingQuestionsQuery {
     onboardingQuestions {
       ... on InformationOnly {
         title
         description
         questionID
         inputType
       }
       ... on StepFinal {
          title
          description
       }
       ... on TimeRangesQuestion {
          title
          description
          timePeriods {
            timePeriod
            estimatedEnd
            estimatedStart
          }
       }
       ... on SingleSelectQuestion {
         title
         description
         questionID
         inputType
         singleSelectAnswer: answer
         singleSelectOptions: options {
           value
           label
         }
       }
       ... on MultiSelectQuestion {
         title
         description
         questionID
         inputType
         multiSelectAnswer: answer
         multiSelectOptions: options
       }
       ... on PercentQuestion {
         title
         description
         questionID
         inputType
         percentAnswer: answer
         min
         max
       }
    }
}

别名对我来说似乎很麻烦并且会使事情变得棘手，因为我在改变数据时必须处理我希望我可以只使用 answer 而不是 singleSelectAnswer.

The aliases seem cumbersome to me and will make things tricky as I'll have to dealias when mutating data my hope was that I could just use answer instead of singleSelectAnswer.

但是当我尝试这样做时，我收到此错误:

But when I try that, I get this error:

{"errors":[{"message":"Fields "answer" conflict because they return conflicting types String! and [Boolean!]!. Use different aliases on the fields to fetch both if this was intentional.","locations":[{"line":64,"column":7},{"line":69,"column":7}]},{"message":"Fields "answer" conflict because they return conflicting types String! and Float!. Use different aliases on the fields to fetch both if this was intentional.","locations":[{"line":64,"column":7},{"line":74,"column":7}]},{"message":"Fields "answer" conflict because they return conflicting types [Boolean!]! and Float!. Use different aliases on the fields to fetch both if this was intentional.","locations":[{"line":69,"column":7},{"line":74,"column":7}]}]}

我是 GraphQL 的新手，不知道这是否是处理它的正确方法.在我的脑海中，我希望遵循多态方法，但也许这不是它完成的方式.

I'm new to GraphQL and don't know if this is the correct way to handle it. In my head I was hoping to follow a polymorphism approach but maybe that's not the way it's done.

推荐答案

我遇到了同样的问题，并找到了三种不同的解决方案:

I had the same problem and find three different solutions to it:

1. 使用界面
2. 使用联合
3. 使用带有附加类型信息的字符串

一切都不是很好，但工作正常.我在 Github 上放了一个包含所有解决方案的简单示例项目:https://github.com/chnoack/apollo-dynamic-types-example

All not very nice but working. I put a simple example project with all solutions on Github: https://github.com/chnoack/apollo-dynamic-types-example

这篇关于GraphQL - 在联合中使用不同类型的相同字段名称的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！