Laravel 5:如何在不覆盖的情况下将多个项放入集合中的同一个键中？

$collection = collect([
    ['name' => 'Apple', 'color' => 'red'],
    ['name' => 'Banana', 'color' => 'yellow'],
    ['name' => 'Orange', 'color' => 'orange'],
    ['name' => 'Apple', 'color' => 'green'],
]);

$grouped = $collection->groupBy('name');

$grouped->all();

[
    'Apple' => [
        ['name' => 'Apple', 'color' => 'red'],
        ['name' => 'Apple', 'color' => 'green'],
    ],
    'Banana' => [
        ['name' => 'Banana', 'color' => 'yellow'],
    ],
    'Orange' => [
        ['name' => 'Orange', 'color' => 'orange'],
    ],
]