通过 id/email 在 graphQL 中查找一个元素

Question

我正在尝试为 graphQL 制作一个 findOneByEmail/id。我看到了几个问题、博客文章和视频，但它们对我的情况没有帮助。我知道我必须添加一个过滤器，但我必须遗漏一些东西

这是我的resolvers

const users = [
  {id: 1, email:'a@a.a',password:'zaq1@WSX', pons:[{value:'test'}]},
  {id: 2, email:'b@b.b',password:'ZAQ!2wsx', pons:[{value:'tset'}]}
];
const pons = [{value: 'test'}];
module.exports = {
  Query: {
    users: () => users,
    pons: () => pons,
  }
};

typeDefs

const {gql} = require('apollo-server-express');

module.exports = gql`  
  type Pon {
      value: String!
  }
  type User {
    id: Int
    email: String!
    password: String!
    pons: [Pon]!
  }
  type Query {
      findUser(id: Int): [User]
      users: [User]
      pons: [Pon]
  }
`;

app.js

const express = require('express');
const { ApolloServer } = require('apollo-server-express');
const typeDefs = require('./graphql/typeDefs.js');
const resolvers = require('./graphql/resolvers.js');

const server = new ApolloServer({typeDefs, resolvers});

const app = express();
server.applyMiddleware({ app });

app.listen({ port: 4000 }, () =>
  console.log(` Server ready at http://localhost:4000${server.graphqlPath}`)
);

我正在使用 express 和 apollo-server-express。

我尝试添加 users(id: Int) 和 users(email: String)，但没有成功。您可以在 findUser 查询中看到它。我这样调用查询：

query{
  findUser(id: 1) {
    email
    pons {
      value
    }
  }
}

在 GQL 操场上。

我希望能够在服务器上过滤数据，而不是在客户端上过滤数据，而且到处都找不到解决方案

Answer 1

您可以在 GraphQL 解析器中获取 id 参数并通过它查询用户。

例如

const express = require('express');
const { ApolloServer } = require('apollo-server-express');
const { gql } = require('apollo-server-express');

const users = [
  { id: 1, email: 'a@a.a', password: 'zaq1@WSX', pons: [{ value: 'test' }] },
  { id: 2, email: 'b@b.b', password: 'ZAQ!2wsx', pons: [{ value: 'tset' }] },
];
const pons = [{ value: 'test' }];

const typeDefs = gql`
  type Pon {
    value: String!
  }
  type User {
    id: Int
    email: String!
    password: String!
    pons: [Pon]!
  }
  type Query {
    findUser(id: Int): User
    users: [User]
    pons: [Pon]
  }
`;

const resolvers = {
  Query: {
    users: () => users,
    pons: () => pons,
    findUser: (_, { id }) => users.find((u) => u.id === id),
  },
};

const server = new ApolloServer({ typeDefs, resolvers });

const app = express();
server.applyMiddleware({ app });

app.listen({ port: 4000 }, () => console.log(` Server ready at http://localhost:4000${server.graphqlPath}`));

GraphQL 游乐场中的查询：

query{
  findUser(id: 1){
    email 
    pons {
      value
    }
  }
}

回复：

{
  "data": {
    "findUser": {
      "email": "a@a.a",
      "pons": [
        {
          "value": "test"
        }
      ]
    }
  }
}

通过 id/email 在 graphQL 中查找一个元素

Finding one element in graphQL by id/email

javascript

express

apollo

graphql

apollo-server