Node.js Node JS和Mongoose如何从2个集合中获取数据？

我需要从

服务

集合中获取所有文档，当我控制台

内容

时，它会显示所有记录。在

content

collection中有一个字段mid，它是

media id

，所有

image

都将进入

media

collection。我需要获取特定服务的

媒体url

。但当我控制台

content.mids

时，它返回未定义。我需要在查询中更改吗

附上代码供您参考

// Controller   
 services: (req, res) => {

    Posts.find({content_type:'service'}).then(function(content) {
                console.log(content); //right
                console.log(content.m_ids); //showing undefined

            Media.findById(content.m_ids).then(media => {

                res.render('default/services', {content: content, reqUrl: req.url});  
            });              
    })

 }

服务模式

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const Schema = new Schema({

    content_type: {
        type: String,
        required: true,
        maxlength:20
    },
    content_title: {
        type: String,
        required: true,
        max:100

    },
    content_url: {
        type: String,
        required: true,
        maxlength:200
    },
    content_description: {
        type: String,
        required: true,
    },
    content_full_description: {
        type: String,
        required: false,
    },
    pt_ids: {
        type: String,
        required: false,
    },
    pc_ids: {
        type: String,
        required: false,
    },
    m_ids: {
        type: String,
        required: false,
    },
    created_by_user_id: {
        type: String,
        default: 1,
    },
    created_on: {
        type: Date,
        default: Date.now
    },
    updated_on: {
        type: Date,
        default: Date.now
    },
    post_icon_svg: {
        type: String,
        required: false,
    }
});

module.exports = {Posts: mongoose.model('content_data', PostsSchema )};

//媒体模型

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const MediaSchema = new Schema({

    media_name: {
        type: String,
        required: true
    },
    media_title: {
        type: String,
        required: true
    },
    media_alt: {
        type: String,
        required: true
    },
    media_description: {
        type: String,
        required: false
    },
    media_url: {
        type: String,
        required: true,
        unique: true
    },
    created_by_user_id: {
        type: String,
        default: 1,
    },
    created_on: {
        type: Date,
        default: Date.now
    },
    updated_on: {
        type: Date,
        default: Date.now
    }
});

module.exports = {Media: mongoose.model('media', MediaSchema )};

---

您能否将服务和媒体模型代码以及示例文档作为json添加到问题中？您需要在媒体模式中保留postId，或在post模式中保留mediaId。否则您无法加入它们。mediaid位于post架构中，因为m_id有人知道这个问题吗？在服务模型中，您发布了post架构，您能否以json格式为每个架构添加所有相关架构和示例文档？并描述预期输出。