我应该如何在 Mongoose 中连接 Schema 模型？

Posted 2023-03-11

【中文标题】我应该如何在 Mongoose 中连接 Schema 模型？

【英文标题】：How should i connect Schema models in Mongoose?

【发布时间】：2020-08-01 15:51:51

【问题描述】：

我想创建一个用户、发布和评论。将它们连接在一起，当我创建一个帖子时，它应该连接到我的一个用户。我不知道为什么我得到一个不寻常的错误。错误：

ID cannot represent value: <Buffer 5e 9b f1 3e e9 49 61 38 fc 1a 6f 59>

这些都是我的代码，所以如果你知道我的问题是什么，请帮我解决它。谢谢

类型定义：

import  gql  from 'apollo-server-express';

export const typeDefs = gql`

    type User 
        id: ID!
        name: String!
        email: String!
        age: Int
        posts: [Post!]!
        comments: [Comment!]!
    

    type Post 
        id: ID!
        title: String!
        body: String!
        published: Boolean!
        author: User!
        comments: [Comment!]!
    

    type Comment 
        id: ID!
        text: String!
        author: User!
        post: Post!
    
`

用户架构：

import mongoose,  mongo  from 'mongoose';

const userSchema = new mongoose.Schema(
    name: 
        type: String,
        required: true
    ,
    email: 
        type: String,
        required: true
    ,
    age: 
        type: Number,
        required: false
    ,
    posts: [
        
            type: mongoose.Schema.Types.ObjectId,
            ref: 'Post'
        
    ],
    comments: [
        
            type: mongoose.Schema.Types.ObjectId,
            ref: 'Comment'
        
    ]
);

module.exports = mongoose.model('User',userSchema);

后架构：

import mongoose from 'mongoose';

const postSchema = new mongoose.Schema(
    title: 
        type: String,
        required: true
    ,
    body: 
        type: String,
        required: true
    ,
    published: 
        type: Boolean,
        required: true
    ,
    author: 
        type: mongoose.Schema.Types.ObjectId,
        ref: 'User'
    ,
    comments: [
        
            type: mongoose.Schema.Types.ObjectId,
            ref: 'Comment'
        
    ]
);

module.exports = mongoose.model('Post',postSchema);

评论架构：

import mongoose from 'mongoose';

const commentSchema = new mongoose.Schema(
    text: 
        type: String,
        required: true
    ,
    author: 
        type: mongoose.Schema.Types.ObjectId,
        ref: 'User'
    ,
    post: 
        type: mongoose.Schema.Types.ObjectId,
        ref: 'Post'
    
);

module.exports = mongoose.model('Comment',commentSchema);

解析器：

import Users from './models/User';
import Posts from './models/Post';
import Comments from './models/Comment';


export const resolvers = 
    Mutation: 
        createUser: async (parent, args, context, info) => 
            const user = new Users(args);
            await user.save();

            return user;
        ,
        createPost: async (parent,  title, body, published, author , context, info) => 
            const user = await Users.findById(author);

            if (!user) 
                console.log("User not found")
            
            console.log(user)

            const post = new Posts( title, body, published, author: user.id );
            await post.save();

            user.posts.push(post);
            await user.save();

            return post;
        
    

【问题讨论】：

请给我们一小部分您的代码。

@DanStarns 好的，但我想确保没有遗漏任何东西

【参考方案1】：

我找到了解决方案，您应该使用 type: mongoose.Schema.Types.ObjectId 和 ref: 'Comment'，然后在解析器中使用 population。