Adding none value to entity in symfony form

Question

In a Symfony form I have one field called slot that matches an entity with a custom query. let's say something like this:

->add('slot', 'entity', array(
    'label'             => 'Slot',
    'class'             => 'FooBarBundle:Slot',
    'property'          => 'name',
    'required'          => false,
    'query_builder'     => function(\Foo\BarBundle\Entity\SlotRepository $er) use ($ids) {
        return $er->createQueryBuilder('u')
            ->where('u.id IN(:ids)')->setParameter('ids', $ids);
    }
))

so far every thing works. The slot is a ManyToOne matching on the Team entity (for which the form is), so there can only be one slot selected at a time. As I said, every thing going according to plan. The user can select a slot and save it and every one's happy.

The trouble starts when you try to "unselect" a slot (yep that has to be possible). So I need to add a none value with a caption like None of the listed items or what ever. The question is how can I do that?

As @absalon.valdes says, 'empty_value' => 'None of the listed items' would do the job. — qooplmao
– qooplmao, Commented Aug 10, 2015 at 7:15
Sounds exactly like what I was looking for. I'll check it as soon as I get home. Could you might make an answer out of your comment, so I can accept it, once I tested it? — wawa
– wawa, Commented Aug 10, 2015 at 8:58
@absalon.valdes could you make an answer out of your comment? that was exactly, what I was looking for! — wawa
– wawa, Commented Aug 10, 2015 at 15:00

Absalon Valdes · Accepted Answer · 2015-08-10 18:30:46Z

1

You should use empty_data and empty_value:

->add('slot', 'entity', array(
    'label'             => 'Slot',
    'class'             => 'FooBarBundle:Slot',
    'property'          => 'name',
    'required'          => false,
    'query_builder'     => function(\Foo\BarBundle\Entity\SlotRepository $er) use ($ids) {
        return $er->createQueryBuilder('u')
            ->where('u.id IN(:ids)')->setParameter('ids', $ids);
    },

    'empty_data'  => null,
    'empty_value' => 'None of the listed items' /* or null */
))

answered Aug 10, 2015 at 18:30

Absalon Valdes

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Comments

user4545769 · Accepted Answer · 2015-08-10 08:00:46Z

0

The way that choice fields (which the entity field extends) are rendered within Symfony forms is defined by a certain kind of logic (documentation). I'm guessing that you're rendering a <select> dropdown, in which case if you're using Symfony 2.6 or above, placeholder is what you want (documentation). Be warned though, with certain databases (e.g. Postgres), the placeholder option was broken in Symfony 2.7.0 and (I think) 2.7.1.

The empty_data / empty_value issue with forms is part of a longstanding confusion. In short, use placeholder.

answered Aug 10, 2015 at 8:00

user4545769

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