How can I define an undefined method named “handleRequest” of class in Symfony 4?

Question

use Symfony\Component\Form\Forms;

public function form($slug, Request $request){
  $id = $request->request->get('id');
  $EntityName = 'App\\Entity\\' . ucwords($slug);
  $item = new $EntityName();
  $item= $this->getDoctrine()->getRepository($EntityName)->find($id);
  $form = $this->createFormBuilder($item);

  foreach ($classes->fieldMappings as $fieldMapping) {
    $form = $form->add($fieldMapping['fieldName'], TextType::class, array('attr' => array('class' => 'form-control')));
  }
  $form->add('cancel', ButtonType::class, array('label' => 'Abbrechen','attr' => array('class' => 'cancel form-btn btn btn-default pull-right close_sidebar close_h')))
  ->add('save', SubmitType::class, array('label' => 'Speichern','attr' => array('id' => 'submit-my-beautiful-form','class' => 'form-btn btn btn-info pull-right','style' => 'margin-right:5px')))
  ->getForm();

  $form->handleRequest($request);
}

Attempted to call an undefined method named "handleRequest" of class "Symfony\\Component\\Form\\FormBuilder".

Answer 1

You're calling the method on the wrong object here. Note that you're calling $this->createFormBuilder() which returns a FormBuilder , not a form.

What I would suggest is name the variable like this:

$formBuilder = $this->createFormBuilder($item);

And then, you're not storing the result of the getForm() call on the form builder. You should do this:

foreach (...) {
  $formBuilder->add(...);
}

$formBuilder
  ->add(...)
  ->add(...)

$form = $formBuilder->getForm();

...and this way you'll get an instance of Form which has the handleRequest() method, and the call to it will produce the result you're expecting.