类Illuminate \ Database \ Eloquent \ Builder的对象无法转换为字符串

I have this code. Everything works fine - it gets data from DB but i cannot be returned. I'm posting it using jQuery.

Route::post('get/images', function(){
    $images = App\Images::where('realisation_id',Request::get('id'));
    return $images;
});

And it returns

Object of class Illuminate\Database\Eloquent\Builder could not be converted to string

I'm stupid!

Route::post('get/images', function(){
    $images = App\Images::where('realisation_id',Request::get('id'))->get();
    return $images->toJson();
});

And everything is cool!