One to One relationship in SonataAdmin - symfony

Question

i trying to make admin page for Product which has relationship 1:1 with image.
Product
/**
* #ORM\Entity
* #ORM\Table(name="products")
class Product
{
/**
* #ORM\Column(type="integer")
* #ORM\GeneratedValue
* #ORM\Id
* #var int
*/
private $id = 0;
/**
* #ORM\OneToOne(targetEntity="Image", mappedBy="product")
*/
private $image;
/**
* #return Image
*/
public function getImage(): ?Image
{
return $this->image;
}
/**
* #param Image $image
*/
public function setImage(Image $image)
{
$this->image = $image;
return $this;
}
}
Image
/**
* #ORM\Entity
* #ORM\Table(name="images")
*/
class Image
{
/**
* #ORM\Column(type="integer")
* #ORM\GeneratedValue
* #ORM\Id
* #var int
*/
private $id = 0;
/**
* #ORM\OneToOne(targetEntity="Product", inversedBy="image")
* #ORM\JoinColumn(name="product_id", referencedColumnName="id")
*/
private $product;
/**
* #return mixed
*/
public function getProduct()
{
return $this->product;
}
public function setProduct(Product $product)
{
$this->product = $product;
}
}
ProductAdmin
class ProductAdmin extends AbstractAdmin
{
protected function configureFormFields(FormMapper $formMapper)
{
$formMapper->add('image', 'sonata_type_admin', array('label' => 'Okładka', 'by_reference' => false,));
}
ImageAdmin
class ImageAdmin extends AbstractAdmin
{
protected function configureFormFields(FormMapper $formMapper)
{
$formMapper
->add('file', 'file', array('label' => 'Okładka', 'required' => false))
->add('path', 'text', array('label' => 'Scieżka do pliku', 'required' => false));
}
I setuped services correctly, but i can't edit product and after saving new one i geting error
unable to find the object with id : 0

Answer 1

Try to not initialize your $id
private $id = 0; // =====> this is a private $id;

Answer 2

You have several mistakes. Let's try to correct your code.
Just follow the tutorials and put right annotation for $id:
/**
* #var integer $id
*
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
Hope, that this is just a typo with "?Image":
/**
* #return Image
*/
public function getImage() : Image
{
return $this->image;
}
And finally.
/**
* Class ProductAdmin
*/
class ProductAdmin extends AbstractAdmin
{
protected function configureFormFields(FormMapper $formMapper)
{
$formMapper
->add('image', 'sonata_type_model_list', [
'btn_add' => true, //Or you can specify a custom label
'btn_list' => 'list button!', //which will be translated
'btn_delete' => false, //or hide the button.
'btn_catalogue' => 'messages', //Custom translation domain for buttons
'label' => 'My image',
], [
'placeholder' => $this->trans('messages.no_images_message'),
'edit' => 'standard',
'inline' => 'standard',
'sortable' => 'id',
])
;
}
}