覆盖子文档时猫鼬模式/方法消失

Question

我有一个带有方法的架构 - 2 种变体。它们在第一次添加地址时都可以正常工作，但是在添加另一个地址时（即当它通过 for 循环时），第一个版本会崩溃。我所说的炸毁的意思是它似乎破坏了我的订单实例 - 没有更多的“保存”方法。

架构

var Address = new Schema({
  type: { type: String, enum: ['shipping', 'billing'] },
  street: { type: String, required: true },
  city: { type: String, required: true },
  region: String,
  country: String,
  postal: { type: String, required: true },
});

var Order = new Schema({
  email: {
    type: String
  },
  address: [Address]
});

现在，如果我在我的架构中添加了 addAddress() 方法。这是我尝试过的 2 个版本。

// Version 1 - has issues on subsequent call
Order.methods.addAddress = function() {

  var data = { type: 'shipping', city: 'Tempe', postal: '85281', street: '420 Mill Ave'};

  for(var i = this.address.length-1; i >=0; i--) {
    if(this.address[i].type === type) {
     delete address[i];   
    }
  }
  this.address.push(data);
}

// Version 2 - works fine
Order.methods.addAddress = function() {

  var data = { type: 'shipping', city: 'Tempe', postal: '85281', street: '420 Mill Ave'};

  var found = false;
  for(var i = this.address.length-1; i >=0; i--) {
    if(this.address[i].type === type) {
      found = true;
      this.address[i] = data;
    }
  }
  if(!found)
    this.address.push(data);
}

在使用 V1 后尝试保存会产生此错误：

Uncaught Exception
TypeError: Object #<Object> has no method 'save'
    at /var/node_modules/mongoose/lib/document.js:1270:13
    at Array.forEach (native)
    at model.pre.err.stack (/var/node_modules/mongoose/lib/document.js:1252:12)
    at model._next (/var/node_modules/mongoose/node_modules/hooks/hooks.js:50:30)
    at model.proto.(anonymous function) [as save] (/var/node_modules/mongoose/node_modules/hooks/hooks.js:96:20)
    at Promise.<anonymous> (/var/controllers/cart.js:79:11)
    at Promise.<anonymous> (/var/node_modules/mongoose/node_modules/mpromise/lib/promise.js:171:8)
    at Promise.EventEmitter.emit (events.js:95:17)
    at Promise.emit (/var/node_modules/mongoose/node_modules/mpromise/lib/promise.js:88:38)
    at Promise.fulfill (/var/node_modules/mongoose/node_modules/mpromise/lib/promise.js:101:20)

让我们看下面的代码：

Order.findById(id.exec(function(err, o) {
  o.addAddress('shipping', { street: '1000 Mill Ave', city: 'Tempe', postal: '85281' });
  console.log(o);
  o.save(function(err, order) {
  });
})

注意到控制台调用了吗？在每个变体中，订单对象似乎都可以：

{
  _id: 007d0000b10000000000000c,
  address: [{
    street: '420 Mill Ave',
    postal: '85281',
    city: 'Tempe',
    type: 'shipping'
    _id: 52b2459f1547a5e12300000b
  }]
}

但它似乎丢失了诸如“保存”方法之类的东西。

有什么想法吗？

Answer 1

您将地址定义为字典而不是地址对象。相反，您应该这样做：

Order.methods.addAddress = function(type, data, next) {

    // Have your removal code here

    var self = this
    var address = new Address(data)
    address.save(function(err, address) {
        if (err) {
            ...
        } else {
            self.address.push(address)
            next()
        }
    })
}

请注意，我正在根据架构定义使用地址对象填充地址数组。