node.js - Mongoose 子文档数组推送

Question

我的情况是，如果person1接受person2交易意味着..person1_id将保存在person2特定deal字段接受中，我已经尝试过如果接受的用户(person2)有一笔交易，它可以完美工作的代码，但如果有多个交易，它会更新但删除其他交易(即，假设person2) > 拥有 3 笔交易意味着如果 person1 接受第三笔交易，则接受的用户 ID 在第三笔交易中更新，并且第一笔和第二笔交易已被删除)。任何人请帮助我如何仅保存更新的交易数组

var incomingUser = req.user;//accepting user accesstoken in header(person1) 
if(req.params.id){
var id = req.params.id;//deal id
console.log("DealId:"+id + "Acceptinguser:"+incomingUser.name);
User.findOne(
{
    "deals": {
      $elemMatch: {
        _id: id
      }
    }
  },
function(err, data){
  console.log("Dealer:" +data.name);
  console.log("deal:"+ data.deals);
  if(err){
    console.log("User not found");
    res.send(new restify.ResourceNotFoundError('failed','Deal not found'));
    return next();
  }
    var dealObj = _.filter(data.deals, { id: id })[0];
    console.log("Deal Obj" + dealObj);
     var acceptingUser = incomingUser;
     console.log("accepting user:" +acceptingUser._id);
     dealObj.accepted = acceptingUser._id;
     console.log("accept id: "+ dealObj.accepted);
     data.deals = dealObj;
     console.log("data:"+ data.deals);
  data.save(function (err, result){
    console.log("Result:" + result);
    if(err){
      console.log("Internal error");
      res.send(new restifyc.InternalError('failed','Error accepting'));
      return next();
    }
    console.log("saved");
    res.send(200,{user: result});
    return next();
  });
});
}
}

我的架构是

var dealSchema = new mongoose.Schema({
shopName: {type: String,required: true},
deal: {type: String,required: true},
price:{type: Number,required: true},
start:{type: Date,default: Date.now},
end:{type: Date},
expiry:{type: Date},
comments:{type: String},
accepted: {type:mongoose.Schema.Types.ObjectId, ref:'user'},//person1 _id
rejected: {type:mongoose.Schema.Types.ObjectId, ref: 'user'}
});
var userSchema = new mongoose.Schema({
  name: { type: String,required: true},
  phone: { type: Number, required: true,unique: true},
  email:{type: String},
  password: {type: String},
  deals:[dealSchema]
  }, {collection: 'user'});
  mongoose.model('Deal', dealSchema);
  mongoose.model('user', userSchema);

Answer 1

是的，为了具体更新您需要的内容，您可以使用 <array>.$对于元素的指定位置:

User.update(
  "deals": {
    $elemMatch: {
      _id: id
    }
  }, {
    "$set": {
      "deals.$" : {/*your deal data*/}
    }
  }, function(err, doc) {

  });

有关如何使用 $ 的更多详细信息通配符https://docs.mongodb.org/manual/reference/operator/update/positional/