symfony2 - How to create a form field of type "entity" without values

Question

I have a Form with an EntityType field. The table from which the values are taken has grown, and the select box that is rendered makes the page to big (=slow to load).

I replaced this:

        ->add(
            'contact',
            'entity',
            array(
                'class' => 'CRMCoreBundle:Contact',
                'required' => false,
                'empty_data' => null,
            )
        )

with:

          ->add(
            'contact',
            'entity',
            array(
                'class' => 'CRMCoreBundle:Contact',
                'choices' => array(),
                'required' => false,
                'empty_data' => null,
            )
        )

to render an empty selectbox, and on the frontend side I use AJAX to populate and autocomplete the selectbox.

The problem is that now when I submit the form, it is not valid. Any ideas?

dmnptr · Accepted Answer · 2014-10-20 15:52:46Z

3

It does not pass validation because the values you are submitting were not added by form component when the form was created. This is to protect the form from accepting unauthorized values.

The proper way to do that is to have your ajax request the form to update the select field on backend using form events, and then update the displayed select with proper values.

More on form events here - http://symfony.com/doc/current/cookbook/form/dynamic_form_modification.html

answered Oct 20, 2014 at 15:52

dmnptr

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4 Comments

Ami Malimovka Over a year ago

thanks for your reply. I already read that, and none of the use cases described there work for me (I guess the third one is the closest).

Ami Malimovka Over a year ago

also, I suspect they didn't test it recently. in their example they add a field to the form in the POST_SUBMIT event handler. But when you try to do that an exception is thrown: "You cannot add children to a submitted form 500 Internal Server Error - AlreadySubmittedException"

dmnptr Over a year ago

It works when you add POST_SUBMIT event listener to a field, not to the whole form.

dmnptr Over a year ago

Also, take a look here - showmethecode.es/php/symfony/symfony2-4-dependent-forms . Some more info on dynamic forms.

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