ManyToOne relation in sonata admin bundle - php

Question

I have an entity which DishesWithCategory by the link to other entities:
/**
* #ORM\ManyToOne(targetEntity="Dishes", cascade={"persist"})
*/
protected $dishes;
/**
* #ORM\ManyToOne(targetEntity="MenuCategory", cascade={"persist"})
*/
protected $category;
In admin i have:
$formMapper
->add('dishes', 'sonata_type_admin', [
'delete' => false,
'btn_add' => false
])
->add('category', 'sonata_type_model',[
'expanded' => true,
'multiple' => true,
])
;
When I try to create a dish, I get the error:
Found entity of type Doctrine\Common\Collections\ArrayCollection on association ZaWeb\MenuBundle\Entity\DishesWithCategory#category, but expecting ZaWeb\MenuBundle\Entity\MenuCategory
Can someone faced with this? how can I fix it?

Answer 1

I didn't fully understand your model but i think that the issue comes from : the multiple => true on category because you can set only one category (ManyToOne) for a DishesWithCategory.
Either you need to change your model to a OneToMany for your $category or you need to remove the ArrayCollection which might be in the constructor of your model and remove multiple => true.
You might need to do :
$formMapper
->add('dishes', 'sonata_type_admin', [
'delete' => false,
'btn_add' => false
])
->add('category', 'sonata_type_model',[
'expanded' => true
])
;