How to avoid empty values from checkbox list by using EntityType form type?

Question

I have a form field like this:

$form->add('tags', EntityType:class, array(
    'class' => Tags::class,
    'multiple' => true,
    'expanded' => true,
    'required' => true,
));

This render a nice checkbox list and I need to ensure that at least one option is selected after submiting the form, but even if the required option is true it doesn't work, I tried with NotBlank() and NotNull() constraints, also doesn't work (i.e. the form is valid).

How to avoid empty values from checkbox list by using EntityType form type?

Veve · Accepted Answer · 2016-10-13 14:48:28Z

5

You can use the Count constraint.

In your entity class:

/**
 * @Assert\Count(
 *      min = "1",
 *      minMessage = "You must specify at least one tag"
 * )
 */
protected $tags

Note that you can specify a max parameter and the according message.

Also, the required option only add required to your field on the client side, it does nothing on the server side.

edited Oct 13, 2016 at 14:48

answered Oct 13, 2016 at 14:42

Veve

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