How to update table after adding element to object field array?

Question

Angular

Good evening!
I display the table in the form:
Head section
-- subsection --
subsection
Head section
-- subsection --
subsection
is an array of objects (in short):

var = [{
  name:"aaa",
  child:[
    {
      name:"bbb"
    }
  ]
}]

the problem is if I add more objects to the child array, then the table is not updated, although the element itself is added (I see through debug)
How to be?

Answer 1

copy the object (angular.copy) and then change.