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我正在使用 neo4j dB，并且我已经设置了 apollo graphql 服务器（使用 graphql-server-express）。假设我的模式有 3 种类型，即“国家”、“州”和“人”，其中 1 个国家可以有多个州，1 个州可以有多个人。

//示例schema.js

import { makeExecutableSchema } from 'graphql-tools';

import resolvers from './resolvers';

 const typeDefs = `
 type Country {
   id: Int! 
   name: String
   state: [State]
   people: [People]

  }

 type State {
     id: Int!
     name: String
     countryID: CountryID
     people: [People]

   }

   type People {
     id: Int!
     name: String
     SSN: String
     stateid:StateID
     countryid:CountryID
    }


    type Query {
      Countries: [Country]
      States: [State]
      Peoples: [People]

      }

    schema {
     query: Query

    }
   `;

   export default makeExecutableSchema({
      typeDefs: typeDefs,
      resolvers,
    });

那么，我应该如何在 resolver.js 文件中编写我的解析器函数，以帮助我从上述任何类型中正确获取数据？

我尝试在 resolver.js 文件中使用以下查询（使用 Cypher 查询语言查询 Neo4j 数据库），但出现类型错误，我无法修复它。

//示例resolver.js 文件。

let neo4j = require('neo4j-driver').v1;
let driver = neo4j.driver("bolt://localhost", neo4j.auth.basic("neo4j", 
  "******"));

 const resolver = {
  Query: {
     Countries(_, params) {
     let session = driver.session();
    let query = "MATCH (country:Country)  RETURN country;"
    return session.run(query, params)
      .then( result => { return result.records.map(record => { return 
      record.get("country").properties })})
    },
 },

 State:{
   state(State) {
    let session = driver.session(),
       params = {countryid: Country.id},
       query = `
        MATCH (s:State-[:PRESENT]->(c:Country)
        WHERE s.countryid = $countryid
        RETURN s;
       `
       return session.run(query, params)
         .then( result => { return result.records.map(record => { return 
     record.get("state").properties })})
      },
    },
  };

export default resolver;
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