问题描述
目前拖出猫鼬和MongoDB我的一个项目,但遇到一个细分市场,该API目前尚不清楚。
Currently trailing out Mongoose and MongoDB for a project of mine but come across a segment where the API is not clear.
我有一个包含几个键和文件,以及那些按键操作系统名为监视列表
的一个模型。这是ID的用户正在观看的数组,但我需要确保这些值保持唯一的。
I have a Model which contains several keys and documents, and one of those keys os called watchList
. This is an array of ID's that the user is watching, But I need to be sure that these values stay unique.
下面是一些示例code:
Here is some sample code:
var MyObject = new Mongoose.Schema({
//....
watching : {type: Array, required: false},
//....
});
所以我的问题是我如何才能确保这些值推入阵永远只能存储一个,所以使得价值独特,可我只是使用独特:真正的
?
感谢
推荐答案
据我所知,在猫鼬做到这一点的唯一方法是调用底层蒙戈运营商(的提及)。在猫鼬,那会是这样的:
To my knowledge, the only way to do this in mongoose is to call the underlying Mongo operator (mentioned by danmactough). In mongoose, that'd look like:
var idToUpdate, theIdToAdd; /* set elsewhere */
Model.update({ _id: idToUpdate },
{ $addToSet: { theModelsArray: theIdToAdd } },
function(err) { /*...*/ }
);
注:此功能需要獴版本> = 2.2.2
Note: this functionality requires mongoose version >= 2.2.2
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