public function decrease_slider_position($position)
{
$number_of_slider = Slider::all()->count();
if ($position < $number_of_slider) {
$current_id = Slider::wherePosition($position)->first()->id;
$next_id = Slider::wherePosition($position + 1)->first()->id;
$current_slider = Slider::whereId($current_id)->first();
$current_slider->position = $position + 1;
$current_slider->save();
$next_slider = Slider::whereId($next_id)->first();
$next_slider->position = $position;
$next_slider->save();
}
return redirect('slider/all');
}