如何使用GraphQL Yoga进行多个嵌套查询?
这是我的数据
{
"user": [{
"id": 1,
"name": "Thomas",
"comment_id": [1, 2, 3]
},
{
"id": 2,
"name": "Riza",
"comment_id": [4, 5, 6]
}
],
"comment": [{
"id": 1,
"body": "comment 1"
},
{
"id": 2,
"body": "comment 2"
},
{
"id": 3,
"body": "comment 3"
}
]
}
这种情况是我想查询特定用户的所有注释,但该用户仅存储comment
id。
这是我的代码
const { GraphQLServer } = require('graphql-yoga');
const axios = require('axios');
const typeDefs = `
type Query {
user(id: Int!): User
comment(id: Int!): Comment
}
type User {
id: Int
name: String
comment: [Comment]
}
type Comment {
id: Int
body: String
}
`;
const resolvers = {
Query: {
user(parent, args) {
return axios
.get(`http://localhost:3000/user/${args.id}`)
.then(res => res.data)
.catch(err => console.log(err));
},
comment(parent, args) {
return axios
.get(`http://localhost:3000/comment/${args.id}`)
.then(res => res.data)
.catch(err => console.log(err));
},
},
User: {
comment: parent =>
axios
.get(`http://localhost:3000/comment/${parent.comment_id}`)
.then(res => res.data)
.catch(err => console.log(err)),
},
};
const server = new GraphQLServer({ typeDefs, resolvers });
server.start(() => console.log('Server is running on localhost:4000'));
所需查询
{
user(id: 1) {
id
name
comment {
id
body
}
}
}
但是找不到返回,因为axios
命中的端点是http://localhost:3000/comment/1,2,3'
如何使其返回所有用户的评论? 谢谢大家!
答案 0 :(得分:1)
假设注释API /comment/:id
仅接受单个ID,则您需要针对每个注释ID进行一次API调用(除非有一个采用多个ID并返回其数据的API),然后从{{ 1}}类型为comment
的字段解析器。
在这种情况下,User
字段的解析器如下所示:
comment
答案 1 :(得分:0)
显然我也找到了其他解决方案
User: {
comment: parent =>
parent.comment_id.map(id =>
axios.get(`http://localhost:3000/comment/${id}`).then(res => res.data)
),
},
明智的选择,您认为哪一种更好?