使用Mongoose增加MongoDB集合中的一个字段

I'm trying to increment a value in a collection in my MongoDB database through Mongoose. This is the demo code shown on the Mongoose website:

我正在尝试通过Mongoose增加MongoDB数据库中集合中的值。这是Mongoose网站上显示的演示代码:

var conditions = { name: 'borne' }
  , update = { $inc: { visits: 1 }}
  , options = { multi: true };

Model.update(conditions, update, options, callback)

And I have something like this:

我有这样的事情:

var conditions = { "uniqueId" : itemId };
var update;
if(increase)
    update = {$inc : {inStock : 1}};
else
    update = {$dec : {inStock : 1}};
Item.update(conditions, update, {}, callback);

As you can see there is not much difference from the Mongoose's website code.

正如您所看到的,与Mongoose的网站代码没有太大区别。

The problem is that when this piece of code is executed, I end up having in my collection one field called $dec (or $inc) which has an object as a field in the form {inStock : 1}. I just would like to increment the inStock entry of the collection. In the Schema I have:

问题是,当执行这段代码时,我最终在我的集合中有一个名为$ dec(或$ inc)的字段,它有一个对象作为{inStock:1}形式的字段。我只想增加该系列的inStock条目。在Schema我有:

var ItemToSell = new Schema({
    uniqueId : { type: Number, index: true }
  , name     : String 
  , type     : String
  , inStock  : Number
});

Can anyone point out what am I doing wrong? Thanks a lot.

谁能指出我做错了什么?非常感谢。

1 个解决方案

#1

A) Make sure you're Mongoose is up-to-date. Older versions were very buggy on Model.update operations because Mongoose attempts to infer when you are merely passing a new object, in which case it turns your update object into a $set operation.

A)确保你的Mongoose是最新的。较旧的版本在Model.update操作上非常错误,因为Mongoose试图推断您何时只是传递一个新对象,在这种情况下,它将您的更新对象转换为$ set操作。

B) Try removing the empty {} from your function call. It is optional, and by passing an empty object rather than actual options, you may be confusing Mongoose into setting the { safe: false } option, which could also be causing your problem. I have not checked the source code to confirm that that could be the issue, but it's probably worth a try.

B)尝试从函数调用中删除空{}。它是可选的,通过传递一个空对象而不是实际选项,您可能会混淆Mongoose设置{safe:false}选项,这也可能导致您的问题。我没有检查源代码以确认这可能是问题,但它可能值得一试。