Question

很抱歉我的英语不好我使用node.js + express.js + mongoose.js 我有mongoose的这个模式为组：

var groupSchema = new mongoose.Schema({
    name: String,
    users: [{type: mongoose.Schema.ObjectId, ref: 'User'}],
    posts: [{type: mongoose.Schema.ObjectId, ref: 'Post'}]
});

这个架构给用户：

var userSchema = new mongoose.Schema({
  login:    { type: String, unique: true, lowercase: true },
  password: String,
  unread:   [{type: mongoose.Schema.ObjectId, ref: 'Post'}]      
});

群组包含与此群组相关的用户列表以及与此群组相关的帖子列表我想要实现的目标：
Group1有用户Mike，John和Jane;
当用户Mike创建新帖子时：1）我找到当前组并选择与该组相关的用户（Group1和用户Mike，John和Jane）;

2）对于用户John和Jane，我必须在unread字段中设置已创建的帖子。（让这个知道，哪个帖子用户还没有读过）这是对的吗？如果是，我如何在ref文档中更新此未读字段？
我试图这样做：
例如：该组的网址：http://localhost:3000/group/first

  app.get('/group/:name', groups.getGroupPage);

  app.post('/group/:name', posts.postCreate);

Posts.js

var Group = require('../models/group');
var User = require('../models/user');
var Post = require('../models/post');

        exports.postCreate = function(req, res) {
         var post = new Post({
            title: req.body.p_title,
            content: req.body.p_content,
            author: req.user
         });
         Group
                  .update({ name: req.params.name }, {upsert:true}, { "$push": { "users.$.unread": post._id } })
                  .populate('users')
                  .exec(function(err,group) {
                       if (err) res.json(err)
                       console.log(group);
                    }
                  );
        }

感谢您的帮助。

Answer 1

你的编码风格与我的有点不同，但我将采取的方式如下：

exports.postCreate = function(req, res) {
  //Create a new post
  var newPost = new Post({
    title: req.body.p_title,
    content: req.body.p_content,
    author: req.user
  });

  //Save the new post
  newPost.save(function(err) {
    if (err) {
      res.json(err);
    }
  });

  //Find the group with the name and populate the users field
  Group.findOne({ name: req.params.name })
    .populate('users')
    .exec(function(err, group) {
      if (err) {
        res.json(err);
        console.log(group);
      }
      if (group) {
        //If group is found loop through the users
        for (var i = o; i < group.users.length; i++) {
          //Check if the current user is somebody else as the author
          if (group.users[i]._id != req.user._id) {
            //Push and save the new post to every user in the group
            //We push the _id of the post because we are using references
            group.users[i].unread.push(newPost._id);
            group.users[i].save(function(err) {
              if (err) {
                throw err;
              }
            });
          }
        }
      } else {
        //Do what you need to do if group hasn't been found
      }
    });
};

此代码假定您的req.user字段已填充为用户架构。

此代码未经测试。所以请调试它。：）

Mongoose更新ref对象？

1 个答案: