src/Charcoal/Admin/Property/Input/NestedWidgetInput.php
protected function formGroupFactory()
    {
        if ($this->formGroupFactory === null) {
            throw new RuntimeException(sprintf(
                'Form Group Factory is not defined for "%s"',
                get_class($this)
            ));
        }

        return $this->formGroupFactory;
    }
protected function formGroupFactory()
    {
        if ($this->formGroupFactory === null) {
            throw new RuntimeException(sprintf(
                'Form Group Factory is not defined for "%s"',
                get_class($this)
            ));
        }

        return $this->formGroupFactory;
    }
protected function formGroupFactory ( ) { if ( $ this -> formGroupFactory === null ) { throw new RuntimeException ( sprintf ( 'Form Group Factory is not defined for "%s"' , get_class ( $ this ) ) ) ; } return $ this -> formGroupFactory ; }
Retrieve the form group factory.

@throws RuntimeException If the form group factory was not previously set.
@return FactoryInterface
Retrieve the form group factory .