在猫鼬中查找和更新对象 [英] Find and Update Object in Mongoose
问题描述
这是我的架构:
const UserSchema = new mongoose.Schema({
name: String,
chats: [{
lastMessage: String,
lastUpdate: Date
}]
});
用户集合:
{
"_id" : ObjectId("59987ef42aafc45204ee8bc3"),
"name" : "Nico",
"chats" : [
{
"_id" : ObjectId("599e58265cf2799c07925488")
"lastMessage": "Test",
"lastUpdate": "Test"
},
{
"_id" : ObjectId("599e59218d4a52c7071f46df")
"lastMessage": "Hi",
"lastUpdate": "01/01/2017"
}
]
},
{
"_id" : ObjectId("59987ef42aafc45204ee8bc3"),
"name" : "Lucas",
"chats" : [
{
"_id" : ObjectId("599e59218d4a52c7071f46df")
"lastMessage": "Hi",
"lastUpdate": "01/01/2017"
}
]
}
我正在尝试在我的应用上实现聊天功能.我正在研究我的函数,它将查找和更新(在每个用户文档上,在 Chat 数组上,ObjectID 等同于请求接收),但我不知道什么是最好的方法以及如何实现它.
I am trying to implement chat on my app. I am working on my function that will find and update (on each User document, on Chat array with ObjectID as equals being received by request) but i don't know whats the best approach and how to implement it.
对我的端点的请求将给我 ChatID、UserID 和 MessageBody.所以我的两种方法是:1) 按 UserID 查找,然后在 chat array prop 上 findAndUpdate,其中 _idChat 等于 ChatID.2)在集合中找到_idChat等于ChatID的地方然后更新(这应该检索我拥有任何带有ChatID的对象的用户然后更新它)
The request to my endpoint will give me ChatID, UserID, and MessageBody. So my two approaches are: 1) Find by UserID, and then findAndUpdate on chat array prop where _idChat is equals as ChatID. 2) Find in Collection where _idChat is equals as ChatID and then update (this should retrieve me Users that have any object with ChatID and then update it)
这就是我想要实现的(但没有任何更新):
This is what i am trying to implement (but having nothing being updated):
static sendMessage(req: express.Request, res: express.Response) {
const message = req.body.message;
const idChat = req.body.idChat;
const userIds = [req.body.sender, req.body.receiver];
const updatePromises = [];
userIds.forEach( userId => {
updatePromises.push(
UserDao['updateChat']
(
userId, idChat,
{'$set': {'chats.$.lastMessage': message, 'chats.$.lastUpdate': new Date() }},
);
});
Promise.all(updatePromises)
.then(values => {
return res.status(200).json(values);
}).catch(reason => {
return res.status(400).json(reason);
});
userSchema.static('updateChat', (userId, chatId, query) => {
return new Promise((resolve, reject) => {
if (!_.isObject(query)) {
return reject(new TypeError('query is not a valid Object.'));
}
if (!_.isString(userId)) {
return reject(new TypeError('userId is not a valid String.'));
}
User
.update(
{_id: userId, 'chats._id': chatId},
{$set: query},
{upsert: true}
).exec((err, updated) => {
err ? reject(err) : resolve(updated);
});
});
});
感谢您的帮助!
推荐答案
这个怎么样?
User.update({
_id: request.userId,
chats: {
$elemMatch: {
_id: request.chatId
}
}
}, {
$set: {
'chats.$.lastMessage': request.messageBody,
'chats.$.lastUpdate': new Date()
},
},
function(err) {
// handle error
console.log(err);
}
)
您将更新符合您条件的确切聊天,因为您将在 $set
命令中使用 $
运算符.
You are going to update the exact chat that matches your criteria because you'll be using the $
operator on the $set
command.
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