How to range query a date field within an array of nested documents?


I have the following User schema:

    const User = mongoose.model(
      new mongoose.Schema({
        email: String,
        password: String,
        name: String,
        days: [
          day: Date,
              average_score: {type: mongoose.Schema.Types.Decimal128, default: 0 }

In the day field I’m storing the days in ISO format like 2020-12-29T00:00:00.000Z. The User.find query is returning all the days instead of returning the data for the days between the Date range and I’m not sure why is this happening.

    User.find({ "_id": getUserId(req), "":{
            "$gte": new Date("2021-01-02T00:00:00.000Z"), 
            "$lt": new Date("2021-01-04T00:00:00.000Z")
        function (err, result) {
          if (err){
            res.status(400).send({data: { message: err }});
          else if(result)
            res.status(200).send({data: { message: result }});

Hello @Stefan_Tesoi, welcome to the MongoDB Community Forum!

Your query looks just about correct as per this documentation example: Query an Array of Embedded Documents - A Single Nested Document Meets Multiple Query Conditions on Nested Fields.

You can use projection : Project Specific Array Elements in the Returned Array. The documentation also says:

See the aggregation operator $filter to return an array with only those elements that match the specified condition.

Here are posts with similar question and use $filter:


Thank you for pointing me to the right solution.

    {$match:{_id: ObjectID("5feb7b1b5438fcda7401f306")}},
    { $project: {
        days: {
          $filter: {
            input: "$days", // le tableau à limiter 
            as: "index", // un alias
            cond: {$and: [
              { $gte: [ "$$", new Date("2020-12-29T00:00:00.000Z") ] },
              { $lte: [ "$$", new Date("2020-12-31T00:00:00.000Z") ] }
  .project({'':1, '':1})
  .then(result => { res.status(200).send({data: { message: result }})})
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