Grouped collection to associative array

I need to achive array in format showed at the end, I’m using laravel collections

$query->get()->groupBy(‘COLOR’)->toArray();

array:2 [
  "GREEN" => array:123 [
    0 => array:2 [
      "color" => "GREEN"
      "id" => "956"
    ]
    1 => array:2 [
      "color" => "GREEN"
      "id" => "50"
    ]
...

JavaScript
​x
 
array:2 [  "GREEN" => array:123 [    0 => array:2 [      "color" => "GREEN"      "id" => "956"    ]    1 => array:2 [      "color" => "GREEN"      "id" => "50"    ]...​

Format I need to achive:

array:1 [
  "GREEN" => array:123 [
    0 => "956"
    1 => "50"
...
]

JavaScript
 
array:1 [  "GREEN" => array:123 [    0 => "956"    1 => "50"...]​

Answer

You should be able to do all of this with the Collection class:

$query->get()->groupBy('COLOR')->map->pluck('id')->toArray()

JavaScript
 
$query->get()->groupBy('COLOR')->map->pluck('id')->toArray()​

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Answer