public function getModelValue()
    {
        if (! is_callable($callback = $this->getCallback())) {
            throw new \Exception('Invalid custom column callback');
        }

        return call_user_func($callback, $this->getModel());
    }
public function getModelValue()
    {
        if (! is_callable($callback = $this->getCallback())) {
            throw new \Exception('Invalid custom column callback');
        }

        return call_user_func($callback, $this->getModel());
    }
public function getModelValue ( ) { if ( ! is_callable ( $ callback = $ this -> getCallback ( ) ) ) { throw new \ Exception ( 'Invalid custom column callback' ) ; } return call_user_func ( $ callback , $ this -> getModel ( ) ) ; }
Get value from callback.

@return mixed

@throws \Exception
Get value from callback .