Apollo Server-当名称空间中的类型不可用时，如何在解析器中创建和添加对象

如何解决Apollo Server-当名称空间中的类型不可用时，如何在解析器中创建和添加对象

在下面的示例中，我尝试创建一个帖子并将其添加到词典“ post”中。当项类型对于解析器的名称空间不可用时，期望该突变如何创建，添加到散列并返回所创建项的类型？

mutation createPost {
  createPost(input: {name: "Post Name"}){
    name
  }
}

index.js：

const { ApolloServer,gql } = require('apollo-server');
const dictionary = {};
const typeDefs = gql`

    input PostSpecInput {
        name: String
    }

    type PostSpec {
        id: ID!
        name: String
    }

    type Mutation {
          createPost(input: PostSpecInput): PostSpec
    }

    type Query {
        post_specs: [PostSpec]
    }
`;

const resolvers = {
    Query: {
        post_specs: () => Object.keys(dictionary).map(function(key){
            return dictionary[key];
        })
    },Mutation: {
        createPost(parent,args,context,info) {
            var id = require('crypto').randomBytes(10).toString('hex');
                const postSpec = new PostSpec(id,args.input);
                posts_mock_database[id] =  args.input;
                return postSpec;
            }
      }
}

const server =  new ApolloServer({typeDefs,resolvers})

server.listen().then(({url}) => {
    console.log(`Server Ready at ${url}`);
})

错误：

{
  "errors": [
    {
      "message": "PostSpec is not defined","locations": [
        {
          "line": 2,"column": 3
        }
      ],"path": [
        "createPost"
      ],"extensions": {
        "code": "INTERNAL_SERVER_ERROR","exception": {
          "stacktrace": [
            "ReferenceError: PostSpec is not defined","    at createPost (index.js:38:34)",

解决方法

类型定义不是类也不是对象实例，它们仅用于强制类型。即使您在名称空间中，调用“ new”也不起作用。这是您的模拟数据库的解决方案：

 Mutation: {
        createPost(parent,args,context,info) {
            var id = require('crypto').randomBytes(10).toString('hex');
                const newPostSpec = { id: id,name: args.input.name }
                posts_mock_database[id] = newPostSpec;
                return newPostSpec;
            }
      }