Answers for "larvel compare request to model if dirty"

laravel model is dirty

if($product->isDirty()){
    // changes have been made
}

laravel update only changed fields

protected function performUpdate(Builder $query, array $options = [])
{
    $dirty = $this->getDirty();

    if (count($dirty) > 0)
    {
        // runs update query
    }

    return true;
}