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symfonysymfony-validator

How to create constraint for limiting max childs

Let's say I have two entities Bus and People with a relation OneToMany between them. Bus can hold a maximum of 10 persons.

How to create a constraint to control this?

For example:

* @MyAssert\ParentMaxChild(max=10)

* @ORM\ManyToOne(targetEntity="Webface\CharacterBundle\Entity\Bus", inversedBy="wac")
* @ORM\JoinColumn(name="bus_id", referencedColumnName="id", nullable=false)

private $bus;
Solution

  • Use the Count constraint.

    In your Bus class, add the constraint in the Person annotation:

    /**
 * ... Rest of the annotation ...
 * @Assert\Count(
 *      max = "10",
 *      maxMessage = "Bus can hold a maximum of 10 persons."
 * )
 */
protected $persons;

    Note that you can specify a min parameter and the according message.