php - Symfony2 & Doctrine2 : removeElement doesn't work

Question

我在 Symfony2 和学说中有一个小项目，我正在尝试更新 2 个相关实体:

成员(member)和汽车

$carMembers = $car->getMembers();
echo count($carMembers); // --> show 2
echo get_class(carMembers[0]); // --> show MyCars\WSBundle\Entity\Member
$car->removeMember($member);
$em->persist($car);
$em->flush();

$carMembers= $car->getMembers();
echo count($carMembers); // --> show 1
echo get_class(carMembers[0]); // --> show MyCars\WSBundle\CarsController !!!

有我的实体:

汽车

/**
 * @ORM\ManyToMany(targetEntity="Member", mappedBy="cars")
 */
private $members;

/**
 * Remove Member
 *
 * @param MyCars\WSBundle\Entity\Member $member
 */
public function removeMember(\MyCars\WSBundle\Entity\Member $member)
{
    $this->members->removeElement($member);
    $member->removeCar($this);
}

成员(member)

/**
 * @ORM\ManyToMany(targetEntity="Car", cascade={"persist"})
 * @ORM\JoinTable(name="cars_membres",
 * joinColumns={@ORM\JoinColumn(name="member_id", referencedColumnName="member_id")},
 * inverseJoinColumns={@ORM\JoinColumn(name="car_id", referencedColumnName="car_id")}
 * )
 */
private $cars;

Answer 1

我想你要找的是orphanRemoval关系选项。

@ORM\ManyToMany(targetEntity="Car", cascade={"persist"}, orphanRemoval=true)

因此，当您从集合中删除项目并刷新实体管理器时，它将从数据库中删除关系记录...