Push values in Mongo Nested Array

Question

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Let's say that we have many documents like this in the photo

I have the above schema. I want to find the document based on _id first and then push an array of values to providedServices which belongs to the _id which is inside barbers array

A little help. Can't seem to find this out!

Answer 1

You need to find the related arrays first. For this, you can use $elemMatch or write it as 'barbers._id': { $elemMatch: parameter }.

Here we tried to find the document by filtering its id and barbers id. You can change the filter as you wish. It can be only filtered on barbers id.

$ Positional Operator can be used to update value.
Also, see the MongoDB Documentation: Update Arrays in a Document

Need to write your DocumentName and your parameters instead of idValue, barbersId, and serviceModel.

const result = await DocumentName.findOneAndUpdate(
  {
   $and: 
     [
       { _id: mongoose.Types.ObjectId(idValue) }, 
       { barbers: { $elemMatch: { _id: mongoose.Types.ObjectId(barbersId) }}}
     ]
  },  
  { $push: { 'barbers.$.providedServices': serviceModel } },
  { new: true });

At first, we found the related barbers array inside of all documents. Then we pushed the model inside of the providedServices array into this barbers array.