Symfony2 OneToMany relationship - remove action isn't called - symfony

Question

I'm using Symfony 2.4.6 and I'm trying to use OneToMany relationship to manage images added to a banner.
I did read a lot about the deletion of a child element (setting orphanRemoval, adding 'remove' to cascade) but none of those worked for me. What I've noticed is that remove actions isn't called at all on update.
I have 2 classes, Banner and BannerFile and using collection field type for adding images and it seems to work OK except the delete action.
class Banner
{
/.../
/**
* #ORM\OneToMany(targetEntity="BannerFile", cascade={"persist", "remove"}, mappedBy="banner", orphanRemoval=true)
*/
private $bannerFiles;
/.../
/**
* Remove bannerFiles
*
* #param BannerFile $bannerFiles
*/
public function removeBannerFile(BannerFile $bannerFiles)
{
$this->bannerFiles->removeElement($bannerFiles);
}
}
class BannerFile
{
/.../
/**
* #var integer $banner
*
* #ORM\ManyToOne(fetch="EXTRA_LAZY", inversedBy="bannerFiles", targetEntity="Banner")
* #ORM\JoinColumn(name="banner_id", nullable=false, onDelete="CASCADE", referencedColumnName="id")
*/
private $banner;
/.../
}
My problem is that the removeBannerFile isn't called.
Thanks for any help.

Answer 1

This happens if you use a database table engine type that does not support foreign keys (such as MyISAM).
Change your engine type to InnoDB, then run the following code to update your database schema.
php console doctrine:schema:update

Answer 2

Add cascade to the ManyToOne definition:
class BannerFile
{
/.../
/**
* #var integer $banner
*
* #ORM\ManyToOne(fetch="EXTRA_LAZY", inversedBy="bannerFiles", targetEntity="Banner", cascade={"remove"})
* #ORM\JoinColumn(name="banner_id", nullable=false, onDelete="CASCADE", referencedColumnName="id")
*/
private $banner;
/.../
}