Question

I have User and Order entity. When user creates order I should check that user cash is greater then cost of order. How to do this?
Example Order entity:

class Order
{
    /**
     * @var integer $id
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var integer $user
     *
     * @ORM\ManyToOne(targetEntity="\App\UserBundle\Entity\User", inversedBy="orders")
     * @ORM\JoinColumn(name="user_id", referencedColumnName="id")
     */
    private $user;

    /**
     *
     * @ORM\Column(type="integer")
     * @Assert\Min(limit = "1", message = "You must enter positive number")
     */
    private $price;
}

Answer 1

Simplest solution – write own validation constraint. As example Unique constraint in FOS User bundle.