Mongo(ose)是否仍然支持字段级唯一性约束? [英] Are field level uniqueness constraints still supported in Mongo(ose)?
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问题描述
在早期版本中,mongoose支持 field 级唯一性约束,如下所示(见于2.7.x 此处):
It looks like mongoose supported field level uniqueness constraints in earlier versions as follows (seen in 2.7.x here):
var SomeSchema = new Schema ({
field: {index: {unique: true}} // field level
})
我在4.4.x文档中找不到任何引用。现在是在架构级别执行此操作的首选方法,如此(见于4.4.x 这里):
I can't find any reference to it in the 4.4.x docs. Is the preferred way to do this on the schema level now, like so (seen in 4.4.x here):
SomeSchema.index({field: 1}, {unique: true}) // schema level
推荐答案
是的,唯一索引是仍然支持Mongoose;请参阅此处和此处。
Yes, unique indexes are still supported in Mongoose; see here and here in the current docs.
来自链接文档的示例:
var s = new Schema({ date: { type: Date, index: { unique: true, expires: '1d' }});
var s = new Schema({ name: { type: String, unique: true }});
Schema.path('my.path').index({ unique: true, sparse: true });
Schema.path('name').index({ unique: true });
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