protected function nullableChanged($field = null)
    {
        if (!$field) {
            $function = debug_backtrace()[1]['function'];
            $field    = lcfirst(substr($function, 3));
        }

        $this->nullableChanged[$field] = true;
    }
protected function nullableChanged($field = null)
    {
        if (!$field) {
            $function = debug_backtrace()[1]['function'];
            $field    = lcfirst(substr($function, 3));
        }

        $this->nullableChanged[$field] = true;
    }
protected function nullableChanged ( $ field = null ) { if ( ! $ field ) { $ function = debug_backtrace ( ) [ 1 ] [ 'function' ] ; $ field = lcfirst ( substr ( $ function , 3 ) ) ; } $ this -> nullableChanged [ $ field ] = true ; }
Trigger the fact the nullable changed

@param null $field
Trigger the fact the nullable changed