Symfony2: form is not created - php

Question

There is a form to create Chain entity.
class ChainType extends AbstractType
{
/**
* #param FormBuilderInterface $builder
* #param array $options
*/
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('name', TextType::class, array('label' => 'Company name'))
->add('logoImageURL', TextType::class, array('label' => 'Company logo'));
}
/**
* #param OptionsResolver $resolver
*/
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'CoreBundle\Entity\Chain'
));
}
}
Here is a newAction to create form and save entity
/**
* Creates a new Chain entity.
*
* #Route("/new", name="chain_new")
*/
public function newAction(Request $request)
{
$chain = new Chain();
$form = $this->createForm(ChainType::class, $chain);
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
$em = $this->getDoctrine()->getManager();
$em->persist($chain);
$em->flush();
return $this->redirectToRoute('chain_show');
}
return $this->render(
'AdminBundle:ChainPanel:new.html.twig',
array('form' => $form->createView())
);
}
Here is a button to create form
<button type="button" class="btn btn-primary">
<a href="{{ path('chain_new') }}">
Add Chain
</a>
</button>
Problem
When I click on 'Add chain' button the form is not created and I m just redirected to 'chain_show' route. What is wrong with my code?
UPDATE - MY SOLUTION
In controller I put newAction before showAction. This fixed problem. However I couldn't find explanation

Answer 1

I'm not sure what are you trying to do, but if you're trying to create a page with ChainType form you should also create a template for that page, like this:
.....
{% block YOUR_BLOCK %}
{{ form(form) }}
{% endblock %}
......
and, also, you don't have to wrap a tag with button tag, just give class="btn btn-primary" to that a tag.

Answer 2

Your issue is that you're using the variable which holds the new Chain object. Please see my example below and this should fix your problem...
public function newAction(Request $request)
{
$chain = new Chain();
$form = $this->createForm(ChainType::class, $chain);
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
$chain = $form->getData();
$em = $this->getDoctrine()->getManager();
$em->persist($chain);
$em->flush();
return $this->redirectToRoute('chain_show');
}
return $this->render(
'AdminBundle:ChainPanel:new.html.twig',
array('form' => $form->createView())
);
}
You're also creating the submit button incorrectly. To test it's all working properly, just use (in your .twig.html file):
{{ form(form) }}

Answer 3

Interesting though, I guess the HTML is wrong for a link. You shouldn't have button wrapped to an anchor tag. Some browsers doesn't support it. instead use as below :
<a href="{{ path('chain_new') }}" class="btn btn-primary">
Add Chain
</a>
If this doesn't solve your issue, Do you see a new entity being created when you click on the link?

Answer 4

In controller I put newAction before showAction. This fixed problem. However I couldn't find explanation