Angular2: Property 'controls' does not exist on type 'AbstractControl'. Error when accessing .control of an object within a formarray thru an index

Question

I\'m trying to push another formbuilder within a formarray but it gives me an error since I think there are no items in the array when initializing the code, hence there are

Answer 1

It seems that the loanTypeForm is treated as AbstractControl... so let's assure compiler that it is FormGroup

var group = this.loanTypeForm as FormGroup;
var array = group.controls['frequency'] as FormArray;
var control = group.controls[index]; // AbstractControl again.. could be casted as needed

and in case, that control is also group or form we just have to use assert (cast) as well

var control = group.controls[index] as FormGroup

And then we can easily continue

control.controls['settings']...