如何集成Neo4j数据库，NestJS框架和GraphQL? [英] How to integrate Neo4j database, NestJS framework and GraphQL?

问题描述

我正在尝试将我的REST API(NestJS)与带有GraphQL查询的新Neo4j数据库集成在一起.有人成功吗?预先感谢

I'm trying to integrate my REST API (NestJS) with new Neo4j database with GraphQL queries. Anybody succeed? Thanks in advance

编辑1 :(我添加了代码)

EDIT 1: (I added my code)

import { Resolver } from "@nestjs/graphql";
import { Query, forwardRef, Inject, Logger } from "@nestjs/common";
import { Neo4jService } from "src/shared/neo4j/neoj4.service";
import { GraphModelService } from "./models/model.service";
import { Movie } from "src/graphql.schema";

@Resolver('Movie')
    export class GraphService {
    constructor(private readonly _neo4jService: Neo4jService) {}

    @Query()
    async getMovie() {
        console.log("hello");
        return neo4jgraphql(/*i don't know how get the query and params*/);
    }
}

推荐答案

我正在使用NestInterceptor来完成此任务:

I am using a NestInterceptor to accomplish this:

@Injectable()
export class Neo4JGraphQLInterceptor implements NestInterceptor {
  intercept(
    context: ExecutionContext,
    next: CallHandler<any>,
  ): Observable<any> | Promise<Observable<any>> {
    const ctx = GqlExecutionContext.create(context);
    return neo4jgraphql(
      ctx.getRoot(),
      ctx.getArgs(),
      ctx.getContext(),
      ctx.getInfo(),
    );
  }
}

要在您的Resolver中使用它:

@Resolver('Movie')
@UseInterceptors(Neo4JGraphQLInterceptor)
export class MovieResolver {}

我的GraphQLModule的配置如下:

@Module({
  imports: [
    GraphQLModule.forRoot({
      typePaths: ['./**/*.gql'],
      transformSchema: augmentSchema,
      context: {
        driver: neo4j.driver(
          'bolt://neo:7687',
          neo4j.auth.basic('neo4j', 'password1234'),
        ),
      },
    }),
  ],
  controllers: [...],
  providers: [..., MovieResolver, Neo4JGraphQLInterceptor],
})

请注意使用transformSchema: augmentSchema来启用自动生成的突变和查询(

Note the usage of transformSchema: augmentSchema to enable auto-generated mutations and queries (GRANDStack: Schema Augmentation)

希望能有所帮助！

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