Symfony2表单构建器添加实体“无法加载类型实体”

Question

I've created a form type in Symfony that extends the Abstract type, and added the fields using the builder, but no matter what I do it won't work!

class MyType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('name', 'text');
        $builder->add('other', 'entity', array(
            'data_class' => 'My\App\DefaultBundle\Entity\Other'
        ));
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'runSpeeds' => 'My\App\DefaultBundle\Entity\My',
        ));
    }

    public function getName()
    {
        return 'my';
    }
}

Could not load type "entity" 500 Internal Server Error - InvalidArgumentException

"My" Entity has a column which references the id of "Other" using a foreign key constraint. I want my form to basically have a drop down in the form for "My" that displays all the values from the "name" column in the "Other" entity using the Other.id -> My.other_id as reference.

Update

I have an OtherType (Form type) and the following will work:

$builder>add('name', new OtherType(), array(
    'data_class' => 'My\App\DefaultBundle\Entity\Other')
)

But this displays the entire entity in the form. I only want one field from the Other entity to display, and in a dropdown with the choices

Answer 1

You didn't provide the required option class .

As mentioned in the documentation of entity Field Type

EDIT:

Moreover you have two syntax issues (" ; " is missing)

$builder->add('name', 'text')
$builder->add('other', 'entity', array(
    'data_class' => 'My\App\DefaultBundle\Entity\Other'
))

Answer 2

Use the required class attribute, as defined in the basic usage http://symfony.com/doc/current/reference/forms/types/entity.html#basic-usage

$builder->add('other', 'entity', array(
    'class' => 'DefaultBundle:Other'
))

If your Other class implements a __toString() method you can use that to determine the label. You can also use property for that:

$builder->add('other', 'entity', array(
    'class' => 'DefaultBundle:Other',
    'property' => 'name',
))

Answer 3

You need to add this:

public function setDefaultOptions(OptionsResolverInterface $resolver)
{
    $resolver->setDefaults(array(
        'data_class' => 'My\App\DefaultBundle\Entity\My'
    ));
}

And change data_class to class in the following lines:

    $builder->add('other', 'entity', array(
        'data_class' => 'My\App\DefaultBundle\Entity\Other'
    ));