How do I $push a value to an array within an embedded document in MongoDB using Mongoose?

[Jay Tolla]

It seems this may be an open issue with MongoDB, https://jira.mongodb.org/browse/SERVER-831, but I'm not sure if there's actually a solution and I'm just thinking about and researching things in the wrong way.
Here is a subset of my schema:
var myModel = new mongoose.Schema({

  arrayA: [{
    subArrayA: [{
        fieldA: String
    }],
    subArrayB: [{
        fieldB: String
    }]
  }],

});
I want to update subArrayA by pushing a value into it. I've tried doing this in various ways with no success. This is the simplest attempt:
myModel.findByIdAndUpdate(req.mymodel.arrayA.id(req.params.id), {
        $push: {
            subArrayA: {
                fieldA: valA
            }
        }
}, function(err) {
     // some stuff
});
I've also tried using "dot notation" in the following way with no success:
myModel.findByIdAndUpdate(req.mymodel.arrayA.id(req.params.id), {
        $push: {
            arrayA.subArrayA: {
                fieldA: valA
            }
        }
}, function(err) {
     // some stuff
});
Everything works fine when pushing directly to arrayA. For example, the code below executes the way I'd hope - by pushing a value into arrayA:
myModel.findByIdAndUpdate(req.mymodel.id, {
    $push: {
        arrayA: {
            fieldA: valA
        }
    }
}, function(err) {
     // some stuff
});
Any help would be much appreciated.

[Sabari Sri]

Hi,

Try the below option.

myModel.find({_id : yourModelId})

      .exec(function(err,modelObj){

     for(var i=0;i<modelObj.arrayA.length;i++){

       if(modelObj.arrayA[i].id.toString()==req.param.id.toString()){

          modelObj.arrayA[i].subArrayA('your_string');

       }

     }

});

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