使用 GraphQL 突变时是否可以不返回任何数据?

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问题描述

我有几个 GraphQL 查询和变更，现在我正在尝试实现一个 delete 变更而不返回任何数据:

 type Mutation{addElement(element: ElementData): IDremoveElement(id: ID): ?}

不过好像是要求删除操作有返回值.有没有办法在 GraphQL 中执行空"响应?如果可能，我想避免诸如返回布尔值或状态标志之类的事情.

我不确定 GraphQL 删除操作的最佳实践是什么.

解决方案

(A) Solution with graphql-scalars

原始答案如下.

这是另一种使用 graphql-scalars 图书馆:

安装 npm install graphql-scalars 然后导入他们的 Void 类型:https://www.graphql-scalars.dev/docs/scalars/void

(B) 使用自定义 scalar

的解决方案<块引用>

注意:使用 void-result from mutations 的设计违背了 GQL 最佳实践"

这个例子是为 NodeJS Apollo 框架编写的，但是很容易转换你的语言/框架的实现

我很确定:有一个名为 graphql-void 的 NPM 包，但如果您不想添加另一个依赖项，只需复制此代码即可.

1.在你的架构中定义 Void-scalar

# 文件:./schema.gql标量空

2.实现解析器

//文件 ./scalar-void.js从'graphql'导入{GraphQLScalarType}const Void = 新 GraphQLScalarType({name: '空',描述:'代表空值'，序列化(){返回空},解析值(){返回空},解析文字(){返回空}})出口无效

3.将解析器添加到 ApolloServer

将 Void 解析器添加到 Apollo Server 实例的选项中:

# 文件:./server.js从apollo-server-express"导入 { ApolloServer }从 './scalar-void' 导入 { Void }const server = new ApolloServer({typeDefs,//使用你的架构解析器:{虚空:虚空，//... 你的解析器},})

4.将 Void 用于架构中的变更

最后，在您的架构中使用新的scalar:

# 文件:./schema.gql类型突变{addElement(element: ElementData): IDremoveElement(id: ID): 无效}

I have several GraphQL queries and mutations, now I'm trying to implement a delete mutation without returning any data:

    type Mutation{
        addElement(element: ElementData): ID
        removeElement(id: ID): ¿?
    }

However, it seems to be required to have a return value for the delete operation. Is there a way to perform an "empty" response in GraphQL? I would like to avoid things like returning a boolean or status flag if possible.

I'm not sure on what are the best practices for GraphQL delete operations.

解决方案

(A) Solution with graphql-scalars

The original answer is below.

Here is another one solution with graphql-scalars library:

install npm install graphql-scalars and then import their Void type: https://www.graphql-scalars.dev/docs/scalars/void

(B) Solution with a custom scalar

Note: design with void-result from mutations goes against "GQL best practices"

This example was written for NodeJS Apollo Framework, but it is pretty easy to convert the implementation for your language/framework

I'm pretty sure: there is an NPM-package named graphql-void but if you don't want to add another one dependency just copy this code.

1. define Void-scalar in your schema

# file: ./schema.gql

scalar Void

2. implement resolver

// file ./scalar-void.js

import { GraphQLScalarType } from 'graphql'

const Void = new GraphQLScalarType({
    name: 'Void',

    description: 'Represents NULL values',

    serialize() {
        return null
    },

    parseValue() {
        return null
    },

    parseLiteral() {
        return null
    }
})
export Void

3. add the resolver to ApolloServer

Add the Void resolver to the options of your instance of Apollo Server:

# file: ./server.js

import { ApolloServer } from 'apollo-server-express'
import { Void } from './scalar-void'

const server = new ApolloServer({
    typeDefs,  // use your schema
    resolvers: {
        Void: Void,
        // ... your resolvers
    },
    
})

4. use Void for your mutations in the schema

Finally, use the new scalar in your schema:

# file: ./schema.gql

type Mutation{
    addElement(element: ElementData): ID
    removeElement(id: ID): Void
}

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