How to get only nested data in Laravel collection - collections

Question

I wrote a database selection like this (Laravel 8):
$users = collect(User::with(['roles','roles.permissions'])->find(21));
The result is the following
=> Illuminate\Support\Collection {#2051
all: [
"id" => 21,
"first_name" => "test",
"name" => "test",
"..." => "...",
"roles" => [
[
"id" => 9,
"name" => "Test",
"permissions" => [
[
"id" => 13,
"name" => "userReadList",
],
[
"id" => 11,
"name" => "userUpdate",
],
],
],
[
"id" => 4,
"name" => "responsible",
"permissions" => [
[
"id" => 10,
"name" => "userRead",
],
[
"id" => 9,
"name" => "userCreate",
],
],
],
],
],
}
Now: What I have to change in the query to get only an array, containing the permissions id as follow: [13,11,10,9]?
Or is my query principal wrong for getting the permissions id

Answer 1

I found the solution:
$userPermissions = collect(User::with(['roles','roles.permissions'])->find(21));
Arr::flatten(Arr::pluck($userPermissions['roles'] , 'permissions.*.id'));
//[13,11,1,4,]
But I think, the better way is the following
$userPermissions = User::with(['roles','roles.permissions'])->find(21);
$userPermissions->roles->pluck('permissions.*.id')->flatten()->toArray();
//[13,11,1,4,]
Also possible it the following approach
$userPermissions = User::with(['roles','roles.permissions'])->where('id',21)->get();
$userPermissions->pluck('roles.*.permissions.*.id')->flatten()->toArray();
//[13,11,1,4,]