Inserting data to nested array in mongodb

Question

I have a document which looks like this

{
 _id:1,
 list_id:23,
 name:\'list01\'
 cards:[
  {
   id:3,
   name:\'card01\'
   categories:[{
    id:10,
    categ         


        

Answer 1

In short, it is not possible.

Nested Arrays

The positional $ operator cannot be used for queries which traverse more than one array, such as queries that traverse arrays nested within other arrays, because the replacement for the $ placeholder is a single value

https://docs.mongodb.com/manual/reference/operator/update/positional/

However, you may want to try $[]

Nested Arrays The filtered positional operator $[] can be used for queries which traverse more than one array and nested arrays.

For an example, see Update Nested Arrays in Conjunction with $[].

https://docs.mongodb.com/manual/reference/operator/update/positional-filtered/#position-nested-arrays-filtered