GraphQL:错误:模式查询必须是对象类型，但是得到:[对象对象] [英] GraphQL: Error: Schema query must be Object Type but got: [object Object]

问题描述

我目前正在尝试为rootQuery继承架构，以获得更多的模块化.当前的设置如下:

I'm currently trying to inherit schemas for a rootQuery in order to get more modularity. The setup currently looks as follows:

invoiceSchema.js

invoiceSchema.js

import {
    GraphQLObjectType,
    GraphQLInt,
} from 'graphql';
export default new GraphQLObjectType({
    name: 'Invoice',
    description: 'A monthly billing invoice for an organization',
    fields: () => ({
        amountDue: {
            type: GraphQLInt,
            description: 'The amount the card will be charged (total + startingBalance with a min value of 0)'
        },
    })
});

rootQuery.js

rootQuery.js

import {
    GraphQLObjectType,
    GraphQLString,
    GraphQLInt,
    GraphQLList,
    GraphQLID
} from 'graphql';
import Invoice from './invoiceSchema';

export default {
    Invoice: {
        type: Invoice,
        resolve(parentValue, args){
            return 'Hello world';
        } 
    }
};  

schema.js

schema.js

import query from './rootQuery';
import {GraphQLSchema} from 'graphql';

export default new GraphQLSchema({query});

---

当尝试执行以下错误并希望获得一些帮助和见解时，因为我在invoiceSchema.js中导出的​​内容显然是ObjectType而不是对象Object.

---

When trying to do the following error and hoped for some help and insight, as what I'm exporting in invoiceSchema.js is clearly an ObjectType and not an object Object.

C:\project\node_modules\graphql\jsutils\invariant.js:19
    throw new Error(message);
    ^

Error: Schema query must be Object Type but got: [object Object].
    at invariant (C:\project\node_modules\graphql\jsutils\invariant.js:19:11)
    at new GraphQLSchema (C:\project\node_modules\graphql\type\schema.js:72:88)
    at Object.<anonymous> (C:/project/api/schema/schema.js:6:16)
    at Module._compile (module.js:573:30)
    at loader (C:\project\node_modules\babel-register\lib\node.js:144:5)
    at Object.require.extensions.(anonymous function) [as .js] (C:\project\node_modules\babel-register\lib\node.js:154:7)
    at Module.load (module.js:507:32)
    at tryModuleLoad (module.js:470:12)
    at Function.Module._load (module.js:462:3)
    at Module.require (module.js:517:17)
[nodemon] app crashed - waiting for file changes before starting...  

实际上是从此处得到的，我我想知道为什么它不起作用...

Actually got the idea from here and I'm wondering why it doesn't work...

推荐答案

您的根查询必须是 GraphQLObjectType 的实例，但是， rootQuery.js 会导出一个普通对象.您需要将导出更改为以下内容:

Your root query needs to be an instance of GraphQLObjectType, however, rootQuery.js is exporting a plain Object instead. You'll need to change your export to something like this:

export default new GraphQLObjectType({
  name: 'RootQuery',
  fields: () => ({
    invoice: {
        type: Invoice,
        resolve(parentValue, args){
            return 'Hello world';
        } 
    }
  })
};

注意:通常的做法是将所有字段名称(包括查询和突变名称)保留在camelCase中，并使用PascalCase作为类型名称，以帮助区分两者.

Note: it's common practice to keep all field names, including query and mutation names, in camelCase and use PascalCase for type names, to help distinguish between the two.

此外，如果您要对架构进行模块化，则使用此处.

Also, if you are modularizing your schema, you may find it helpful to utilize graphql-tools for generating your schema instead. IMO, it makes your schema more readable and helps avoid some of the more common pitfalls you may face when modularizing a schema. The docs have a great example of how to modularize your schema with makeExecutableSchema here.

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