node.js - 无法将对象添加到文档内的 MongoDB 数组

Question

我正在为我的聊天应用程序构建一个 API，并编写了下面的端点以在 MongoDB 中保存新消息。

消息本身是一个数组。

使用 Postman 测试此端点会在响应中返回新创建的消息，但该消息不会添加到我的消息数组中。

router.post('/:id/messages', async (request, response) => {
  const chatMessage = new Message({
    type: request.body.type,
    body: request.body.body,
    author: request.body.author
  });
  try {
    const newMessage = await chatMessage.save({ $push: { chatMessage } });
    response.status(201).json(newMessage);
  } catch (error) {
    response.status(400).json({ message: error.message });
  }
});

这是我的 Mongoose 消息架构:

const mongoose = require('mongoose');

const messageSchema = new mongoose.Schema({
  type: {
    type: String
  },
  body: {
    type: String
  },
  author: {
    type: String
  },
  date: {
    type: Date,
    default: Date.now
  }
});

module.exports = mongoose.model('Message', messageSchema);

关于我做错了什么有任何提示吗？太感谢了! :-)

编辑_ Mongo DB Sample

Answer 1

请进行以下更改:

聊天架构文件:

/** messages schema w.r.t. messages field in chat document */
const messageSchema = new mongoose.Schema({
    type: {
        type: String
    },
    body: {
        type: String
    },
    author: {
        type: String
    },
    date: {
        type: Date,
        default: Date.now
    }
});

/** Actual chat schema */
const chatsSchema = new mongoose.Schema({
    id: Number,
    user1: String,
    user2: String,
    messages: [messageSchema]
});

function getChatsModel() {
    if (mongoose.models && mongoose.models.chats) {
        return mongoose.models.chats;
    }
    return mongoose.model('chats', chatsSchema, 'chats');
}

module.exports = getChatsModel();

代码:

/** Import chats model file here & also do require mongoose */
router.post('/:id/messages', async (request, response) => {
    const chatMessage = {
        messages: {
            type: request.body.type,
            body: request.body.body,
            author: request.body.author
        }
    };
    try {
        const id = mongoose.Types.ObjectId(request.params.id);
        const dbResp = await Chats.findOneAndUpdate({ "_id": id }, { $push: chatMessage }, { new: true }).lean(true);
        if (dbResp) {
            // dbResp will be entire updated document, we're just returning newly added message which is input.
            response.status(201).json(chatMessage);
        } else {
            response.status(400).json({ message: 'Not able to update messages' });
        }
    } catch (error) {
        response.status(500).json({ message: error.message });
    }
});