multiple choice dropdown with option groups using symfony “entity”? - symfony

Question

I have the entity Property with manyToMany to Feature that is oneToMany of FeatureType. The multi-choice drop-down is being implemented in the Property create form.
PropertyRoomAdmin.php
protected function configureFormFields(FormMapper $formMapper)
{
$property = $this->getProperty();
$featuresChoices = $this->getRepository('TestBundle:Feature')->getChoicesWithCategoryGroup();
$formMapper
->add('features', 'entity', array(
'label' => '設備（こだわり条件？）',
'class' => 'TestBundle:Feature',
'choices' => $featuresChoices,
'property' => 'name'
))
;
}
FeatureRepository.php
public function getChoicesWithCategoryGroup()
{
$choices = array();
$qb = $this->createQueryBuilder('p');
$qb->select('p, c');
$qb->LeftJoin('p.featureCategory', 'c');
$qb->orderBy('c.name', 'DESC')->addOrderBy('p.name', 'DESC');
$products = $qb->getQuery()->execute();
$choices = [];
foreach ($products as $product) {
$choices[$product->getFeatureCategory()->getName()][] = $product;
}
return $choices;
}
Neither the property "features" nor one of the methods "addFeatur()"/"removeFeatur()", "addFeature()"/"removeFeature()",
"setFeatures()", "features()", "__set()" or "__call()" exist and have
public access in class "TestBundle\Entity\PropertyRoom".
I tried 'multiple' => true code got error
->add('features', 'entity', array(
'label' => '設備（こだわり条件？）',
'class' => 'EstateBundle:Feature',
'choices' => $featuresChoices,
'property' => 'name',
'multiple'=> true,
'required' => false
))
ERROR - Failed to create object: EstateBundle\Entity\PropertyRoom
Context: {"exception":"Object(Sonata\AdminBundle\Exception\ModelManagerException)","previous_exception_message":"An exception occurred while executing 'INSERT INTO property_room_features (property_room_id, feature_id) VALUES (?, ?)' with params [168, 50]:\n\nSQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '168-50' for key 'PRIMARY'"}

Answer 1

Where you setup your options array:
foreach ($products as $product) {
$choices[$product->getFeatureCategory()->getName()][] = $product;
}
Change it to something like this:
foreach ($products as $product) {
$choices[$product->getFeatureCategory()->getName()][$product->getName()] = $product->getId();
}