我们如何从阿波罗服务器模块在 ApolloServer 中传递数据源和合并的 graphql 模式和解析器

Question

我有一个情况，我有模式，reolvers坐在各种不同的文件中。我已将架构和解析器导入服务器.js该文件负责创建阿波罗服务器。目前，一组解析器和查询，我正在导入，另一组查询和解析器已经在服务器.js文件中。

这是服务器.js文件的内容。

import "graphql-import-node";
import { ApolloServer, gql } from "apollo-server";
import { makeExecutableSchema } from "graphql-tools";
import merge from "lodash/merge";
import GithubFetchHelper from "./github/GithubFetchHelper";
import {
  resolvers as GithubResolvers,
  typeDefs as GithubTypeDef
} from "./github";
/**
 * Error Handler. Provides full stack - remove for production
 */
const books = [
  {
    title: "Harry Potter and the Chamber of Secrets",
    author: "J.K. Rowling"
  },
  {
    title: "Jurassic Park",
    author: "Michael Crichton"
  }
];
const typeDefs = gql`
  # Comments in GraphQL are defined with the hash (#) symbol.
  # This "Book" type can be used in other type declarations.
  type Book {
    title: String
    author: String
  }
  # The "Query" type is the root of all GraphQL queries.
  # (A "Mutation" type will be covered later on.)
  type Query {
    books: [Book]
  }
`;
const resolvers = {
  Query: {
    books: () => books
  }
};
// typeDefs: [
//   project.typeDefs,
//   task.typeDefs,
//   search.typeDefs
// ].join(' '),
// resolvers: merge({}, project.resolvers, task.resolvers, search.resolvers),
// context: {
//   models: {
//     project: project.model,
//     task: task.model
//   },
//   loaders: loaders()
// }
const server = new ApolloServer({
  typeDefs: [typeDefs, GithubTypeDef],
  resolvers: merge({}, resolvers, GithubResolvers),
  dataSources: () => {
    return {
      gitHubApi: new GithubFetchHelper()
    };
  }
});
server.listen().then(({ url }) => {
  console.log(`🚀  Server ready at ${url}`);
});
export default server;

现在，当我运行服务器时，出现以下错误。任何帮助，不胜感激。

Error: Type "Query" was defined more than once.

我的尝试 我已经参考了 apollo 文档的数据源以及使用 graphql-tools 中的 gql 合并多个模式和解析器。但是我没有在他们也使用数据源的地方获得任何 gql 的实现。

任何帮助，不胜感激。

注意：我对 Graphql 很陌生

Answer 1

从代码中，您将 2 个 typedef 作为数组传递，这可能是您收到错误的原因。您需要将架构拼接在一起。看：

• https://www.graphql-tools.com/docs/schema-stitching/stitch-combining-schemas
• https://blog.apollographql.com/the-next-generation-of-schema-stitching-2716b3b259c0

Answer 2

假设您在主 js 文件中导入了模式和解析器，您可以按以下方式进行拼接。您可以使用require-graphql-file模块来简化 graphQL 模式导入。

import {merge } from 'lodash'
import requireGraphQLFile from 'require-graphql-file';
import {makeExecutableSchema } from 'apollo-server';
import resolver1 from  './resolvers/resolver1';
import resolver2 from  './resolvers/resolver2';
import resolver3 from  './resolvers/resolver3';
const schema1= requireGraphQLFile('./schema/schema1');
const schema2= requireGraphQLFile('./schema/schema2');
const schema3= requireGraphQLFile('./schema/schema3');
const resolvers = merge(resolver1, resolver2, resolver3)
const typeDef = gql `
type Query {
getData(filters:Filter,limit:Int,offset:Int):Result
}`;
const schema = makeExecutableSchema({
typeDefs: [typeDef, schema1,schema2, schema3],
resolvers
});
const server = new ApolloServer({
    schema
});