symfony2 Catchable Fatal Error: Object of class could not be converted to string

Question

I have this Entity defined:

Answer 1

You can also use the property accessor into your form:

->add('categoryDescription', 'collection',
            array(
                'type'         => new CategoriesDescriptionType(),
                'allow_add' => true,
                'options'      => array('data_class' => 'Apw\BlackbullBundle\Entity\CategoriesDescription'),
                'by_reference' => false,

            ))

And add 'property' => 'name' in your CategoriesDescriptionType.

By the way the @CoachNono answer is ok too.

Answer 2

For Symfony 3.x

According with Symfony docs v3.x you should use choice_label property to specify the entity field name to be used here.

->add('categoryDescription', 'collection',
        array(
            'type'         => new CategoriesDescriptionType(),
            'allow_add' => true,
            'options'      => array('data_class' => 'Apw\BlackbullBundle\Entity\CategoriesDescription'),
            'choice_label' => 'name',
            'by_reference' => false,

        ))

Answer 3

You need to implement the __toString() method in your Apw\BlackbullBundle\Entity\CategoriesDescription.

You could do:

public function __toString() {
    return $this->name;
}

Answer 4

so I solved the problem by get the value of relative parent in the method $form->isValid()

public function createCategoryAction(Request $request){

        $category = new Categories();
        $categoryDesc = new CategoriesDescription();
        $category->addCategoryDescription($categoryDesc);
        $categoryDesc->setCategory($category);

        $form = $this->createForm(new CategoriesType(), $category);
        $form->handleRequest($request);

        if($form->isValid()){
        //exit(\Doctrine\Common\Util\Debug::dump($parentCategory->getId()));
            $em = $this->getDoctrine()->getManager();
            if(!$category->getParentId()){
                $category->setParentId(0);
            }else{
            // get parent id value from input choice
            $parent = $category->getParentId();
            $parentCategory = $parent->getCategory();
            // end
                $category->setParentId($parentCategory->getId());
            }
            $em->persist($category);
            $em->persist($categoryDesc);
            $em->flush();

            return $this->redirect($this->generateUrl('apw_blackbull_categories_showcategories'));
        }

        return array(
            'form' => $form->createView()
        );
    }

thanks!

Answer 5

I got the same error but i tweaked it a little bit by adding:

public function __toString() 
{
    return (string) $this->name; 
}

I'm sure i was getting null instead of a string value. (I was working with sonata-project).