Submit Button is not rendered in Symfony 2.x Form - forms

Question

I'm creating a from using Symfony Form builder, and rendering it using twig.
Here is my form builder code:
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('name', 'text', array(
'required' => TRUE,
))
->add('link', 'text', array(
'required' => TRUE,
))
->add('submit', 'submit', array(
'attr' => array(
'class' => 'btn btn-primary btn-sm custom-btn'
)
))
;
}
And my twig template is like this:
{{ form_start(form)}}
<div>
{{ form_label(form.name) }}
{{ form_widget(form.name) }}
</div>
<div>
{{ form_label(form.link) }}
{{ form_widget(form.link) }}
</div>
<div>
{{ form_widget(form.submit) }}
</div>
{{ form_end(form) }}
In this case, I'm getting everything as expected, except the submit button. Instead of custom submit button created in form builder, it is rendering default submit button with a label create.
What I'm doing wrong here?

Answer 1

Seems it is some issue with 'submit' name. For example, next example works:
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
.... // your fields here
->('my_button', 'submit');
}
Then in the twig template:
<div>
{{ form_widget(form.my_button) }}
</div>
UPDATED : according to http://symfony.com/doc/current/reference/forms/twig_reference.html you can use {{ form_widget(form.submit, {'label': 'submit'}) }}. So next lines renders submit with 'submit' name:
{{ form_start(form) }}
{{ form_widget(form.text) }}
{{ form_widget(form.code) }}
{{ form_widget(form.submit, {'label': 'submit'}) }}
{{ form_end(form) }}
And you don't need to add submit to your FormType in this case.