/**
* @test
*/
public function it_should_group_by_key_deep()
{
$items = [['id' => 1, 'name' => 'foo', 'thing' => ['parent_id' => 10]], ['id' => 2, 'name' => 'bar', 'thing' => ['parent_id' => 11]], ['id' => 3, 'name' => 'baz', 'thing' => ['parent_id' => 10]]];
$collection = new Map($items);
$grouped = $collection->groupBy(function ($element) {
return $element['thing']['parent_id'];
});
$expected = [10 => [['id' => 1, 'name' => 'foo', 'thing' => ['parent_id' => 10]], ['id' => 3, 'name' => 'baz', 'thing' => ['parent_id' => 10]]], 11 => [['id' => 2, 'name' => 'bar', 'thing' => ['parent_id' => 11]]]];
$this->assertEquals($expected, $grouped->toArray());
}