将 created_at 和 updated_at 字段添加到猫鼬模式 [英] add created_at and updated_at fields to mongoose schemas

问题描述

有没有办法将 created_at 和 updated_at 字段添加到 mongoose 模式中，而不必每次调用 new MyModel() 时都将它们传递进来?

Is there a way to add created_at and updated_at fields to a mongoose schema, without having to pass them in everytime new MyModel() is called?

created_at 字段将是一个日期，并且仅在创建文档时添加.每当在文档上调用 save() 时，updated_at 字段都会更新为新日期.

The created_at field would be a date and only added when a document is created. The updated_at field would be updated with new date whenever save() is called on a document.

我已经在我的架构中尝试过这个，但是除非我明确添加它，否则该字段不会显示:

I have tried this in my schema, but the field does not show up unless I explicitly add it:

var ItemSchema = new Schema({
    name    : { type: String, required: true, trim: true },
    created_at    : { type: Date, required: true, default: Date.now }
});

推荐答案

从 Mongoose 4.0 开始，您现在可以在架构上设置时间戳选项，让 Mongoose 为您处理:

As of Mongoose 4.0 you can now set a timestamps option on the Schema to have Mongoose handle this for you:

var thingSchema = new Schema({..}, { timestamps: true });

您可以像这样更改所用字段的名称:

You can change the name of the fields used like so:

var thingSchema = new Schema({..}, { timestamps: { createdAt: 'created_at' } });

http://mongoosejs.com/docs/guide.html#timestamps

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