Updating a Nested Array with MongoDB

Question

I am trying to update a value in the nested array but can\'t get it to work.

My object is like this

 {
    \"_id\": {
        \"$oid\": \"1\"
    },
         


        

Answer 1

I know this is a very old question, but I just struggled with this problem myself, and found, what I believe to be, a better answer.

A way to solve this problem is to use Sub-Documents. This is done by nesting schemas within your schemas

MainSchema = new mongoose.Schema({
   array1: [Array1Schema]
})

Array1Schema = new mongoose.Schema({
   array2: [Array2Schema]
})

Array2Schema = new mongoose.Schema({
   answeredBy": [...]
})

This way the object will look like the one you show, but now each array are filled with sub-documents. This makes it possible to dot your way into the sub-document you want. Instead of using a .update you then use a .find or .findOne to get the document you want to update.

Main.findOne((
    {
        _id: 1
    }
)
.exec(
    function(err, result){
        result.array1.id(12).array2.id(123).answeredBy.push('success')
        result.save(function(err){
            console.log(result)
        });
    }
)

Haven't used the .push() function this way myself, so the syntax might not be right, but I have used both .set() and .remove(), and both works perfectly fine.