猫鼬从html datepicker找到2个日期之间的结果

Question

I have the following sub-documents :

{
 id: 1,
 date:2019-04-01 00:21:19.000
 },
{
 id: 2, 
 date:2019-03-31 00:21:19.000
} ...
Document schema is :
const barEventSchema = new Schema({
id: {
    type: Number,
    unique: true,
    required: true
},
raw: { type: String },
date: { type: Date },
type: { type: String },

})

const FooSchema = new Schema({
   bar: [barEventSchema]
})

I want to do a query based on a date range picked from html input, which has values like 2019-04-01 , 2019-03-31 . So on serverside, I want to do something like:

//@star_date = 2019-04-01, @end_date = 2019-04-01
Foo.findOne('bar.date' : {$lte : start_date, $gte: end_date})

However, this returns all the documents.

Answer 1

All documents having any subdocument with date between start and end date range can be retrieved using:

const conditions = {
  'bar': {
    $elemMatch: {
      'date': {
        $gte: new Date(start_date), 
        $lte: new Date(end_date)
      }
    }
  }
}

Foo.find(conditions)

This will return all the documents where there is at least a subdocument having its date between the range specified in condition . The $elemMatch operator is used to effect this condition on the date field of the bar subdocument.