猫鼬自定义架构类型日期间隔

Question

I have many fields in my documents of type date intervals, such as this

{
    publishDate:
    {
       start: {type: Date, required: true},
       end: {type: Date, required: true}
    }
}

To reduce duplication of the code and make it easier to maintain, how to create custom Mongoose type, for instance DateInterval , containing two fields:

1. start
2. end

and containing validator that makes sure both fields are filled out, and start is before end?

Answer 1

You can reuse schemas in mongoose.

var DateIntervalSchema = new Schema({
   start: {type: Date, required: true},
   end: {type: Date, required: true}
});

var SomeSchema = new Schema({
   publishDate: [DateIntervalSchema],
   // ... etc
});

You can also reference documents from other collections.

var SomeSchema = new Schema({
   publishDate: {type: Schema.ObjectId, ref: 'DateInterval'}
});    

//using populate
SomeModel.findOne({ someField: "value" })
   .populate('publishDate') // <--
   .exec(function (err, doc) {
      if (err) ...

   })

Answer 2

You'll want to develop a custom schema type. There are a number of plugins that do this already, one of which, for long numbers, can be found here: https://github.com/aheckmann/mongoose-long/blob/master/lib/index.js . This is a good basic example to follow.

For your purposes, then, you can create a DateInterval custom schema, casting it as type Date , and then use a validator to check start and end - http://mongoosejs.com/docs/api.html#schematype_SchemaType-validate .

Answer 3

Since mongoose >=4.4 you can implement your custom schema type .

Documentation is not very clear, but you can follow this example .

You have to:

• define your DateInterval custom object with toBSON() / toJSON() and toObject() prototype methods

• define the DateIntervalType inherited from mongoose.SchemaType for handle the mongoose integration, and casting to DateInterval .

In this way you can achieve full control on memory ( Mongoose model ) and mongodb ( raw's bson ) data representation.