使用$ push更新猫鼬子文档中的多个字段

本文介绍了使用$ push更新猫鼬子文档中的多个字段的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我有一个包含两个用户的对话模式.我想标记要从一个用户删除的邮件，以便其他收件人仍可以阅读该邮件.

I have a conversation schema which will contain two users. I want to flag messages to be deleted from one user so the other recipient still able to read the message.

架构

// Messages Schema var messagesSchema = new Schema({ from: { type: Schema.Types.ObjectId, required: true, ref: 'User', }, content: { type: String, required: true, trim: true }, deleted_by: [{ type: Schema.Types.ObjectId, ref: 'User' }], read_by: [{ type: Schema.Types.ObjectId, ref: 'User' }], }, { timestamps: true }); // Conversation Schema var conversationsSchema = new Schema({ recipients: [{ type: Schema.Types.ObjectId, required: true, ref: 'User', index: true }], messages: [messagesSchema], }, { timestamps: true });

现在，当我在两个用户之间创建对话时，它将类似于以下内容

Now when I create a conversation between two users it will look like the following

[ { "_id": "57bb6fed3d001f054e809175", "updatedAt": "2016-08-22T21:37:30.631Z", "createdAt": "2016-08-22T21:34:37.381Z", "__v": 2, "messages": [ { "updatedAt": "2016-08-22T21:34:37.380Z", "createdAt": "2016-08-22T21:34:37.380Z", "from": "57b7448668d04d3035774b9a", "content": "Hello are you there?", "_id": "57bb6fed3d001f054e809176", "read_by": [], "deleted_by": [] }, { "updatedAt": "2016-08-22T21:34:58.060Z", "createdAt": "2016-08-22T21:34:58.060Z", "from": "57b7448668d04d3035774b9a", "content": "I miss you", "_id": "57bb70023d001f054e809177", "read_by": [], "deleted_by": [] }, { "updatedAt": "2016-08-22T21:37:30.631Z", "createdAt": "2016-08-22T21:37:30.631Z", "from": "57b7816b68d04d3035774b9b", "content": "Hey... Me too", "_id": "57bb709a3d001f054e809178", "read_by": [], "deleted_by": [] } ], "recipients": [ "57b7448668d04d3035774b9a", "57b7816b68d04d3035774b9b" ] } ]

现在，当其中一个用户想要从他的身边删除对话时，我想将用户ID添加到每条消息内的deleted_by数组中.

Now when one of the users want to delete the conversation from his side I want to add the user id to the deleted_by array inside each message.

我正在尝试做这样的事情

I am trying to do something like this

Conversation.findOneAndUpdate({ _id: conversation_id }, { $push: { 'messages.deleted_by': req.loggedInUser._id } }, function(err, data) { if(err) return next(err); res.json(data); })

返回错误

TypeError: Cannot read property '$isMongooseDocumentArray' of undefined

我试图添加$符号，但仍然遇到相同的错误.

I tried to add the $ sign and still getting the same error.

推荐答案

尝试一下:

Conversation.findOne({ _id: conversation_id }, function(err, docs) { if(err) return next(err); if(docs) { docs.messages.forEach(function(msg,index,array) { msg.deleted_by.push(req.loggedInUser._id); }); docs.save(); } });

阅读此以取得更好的效果了解forEach函数.

Read this for better understanding of forEach function.

我希望这会有所帮助.