You can avoid this error by setting the "data_class" when use sonata_media_type

Question

I installed Sonata Admin and after install Sonata Media

i have class admin for "colors" and set in configureFormFields

->add('image', 'sonata_media_type', array('required' => false,
   'context' => 'default',
   'label' => 'Image',
   'provider'=>'sonata.media.provider.image'
 ))

While stored in the database but when edit show this error

The form's view data is expected to be an instance of class Application\Sonata\MediaBundle\Entity\Media, but is a(n) string. You can avoid this error by setting the "data_class" option to null or by adding a view transformer that transforms a(n) string to an instance of Application\Sonata\MediaBundle\Entity\Media.

Help me, please.

Please include the full Exception in your answer and provide the Form and the important parts of your controller. — Nicolai Fröhlich

Baba Yaga Baba Yaga · Accepted Answer · 2013-05-23T06:52:22

You have to set the correct data class:

->add('media', 'sonata_media_type', array(
                     'provider' => 'sonata.media.provider.image',
                     'context'  => 'default',
                     'data_class'   =>  'Application\Sonata\MediaBundle\Entity\Media',
                     'required'   =>  false,
                     'label'    =>  'Image'
                ))

Notice the: 'data_class' => 'Application\Sonata\MediaBundle\Entity\Media',

You can avoid this error by setting the "data_class" when use sonata_media_type

2 Answers