希望在nestjs解析器中使用proxyToSchema

Question

我有一个本地模式和一个远程模式。本地模式包含远程模式的子集，应将其代理到远程graphql服务器。

通常我会使用类似的东西：

public async getCar(
  obj: any,
  args: any,
  context: any,
  info: any
): Promise<Car> {
  return info.mergeInfo.delegateToSchema({
    args: {
      id: context.userId,
    },
    context: {},
    fieldName: 'car',
    info,
    operation: 'query',
    schema: carExecutableSchema,
    transforms: [],
  });
}

但是mergeInfo字段上没有info。

要获取我正在使用的远程模式：

const fetchRemoteSchema = async (): Promise<GraphQLSchema> => {
  const http = new HttpLink({
    fetch: nodeFetch,
    uri: process.env.CAR_GRAPHQL_URL,
  });

  const link = setContext((request, previousContext) => ({
    headers: {
      Authorization: `Basic ${process.env.CAR_BASIC_AUTH_TOKEN}`,
    },
  })).concat(http);

  const carSchema = await introspectSchema(link);

  const executableSchema = makeRemoteExecutableSchema({
    link,
    schema: carSchema,
  });
  return executableSchema;
};

并且我在模块中使用它来初始化graphql

GraphQLModule.forRootAsync({
    imports: [CarModule],
    inject: [CarService],
    useFactory: (mainAppService: MainAppService) => ({
      context: async ({ req }) => {
        return {
          userId: 1
        };
      },
      definitions: {
        outputAs: 'interface',
        path: '../../myschema.gql',
      },
      typePaths: ['./**/*.graphql'],
    }),
  }),

我如何使mergeInfo可用？还是有一种更简单的方法来委托graphql请求？

Answer 1

info.mergeInfo仅在使用mergeSchemas([])创建架构时可用。您可以通过以下方式将delegateToSchema导入为函数：import { delegateToSchema } from "apollo-server-express";