Symfony / Doctrine 2.x - 显示表单 EntityType::class 用户列表 - 保存@OneToMany - 错误

Question

使用 Symfony 4.1，Doctrine 2.x，我有三个实体。一个 Subscription 可以分配多个 Identities（又名用户帐户）。当保存哪些身份属于屏幕上当前可见的订阅时（通过标准的 Symfony 形式），它失败了。

Identity.php

class Identity implements UserInterface, \Serializable, InteractiveLoginUserInterface
{
    /**
     * @var int
     *
     * @ORM\Column(type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var string|null
     *
     * @ORM\Column(type="string", length=255, unique=true)
     * @Assert\NotBlank()
     * @Assert\Email()
     * @Assert\Length(max="255")
     */
    public $username;

Subscription.php

class Subscription
{
    /**
     * @ORM\Column(type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    public $id;
    /**
     * @var bool
     * @ORM\Column(type="boolean")
     */

    /**
     * @var Collection
     * @ORM\OneToMany(targetEntity="SubscriptionIdentity", mappedBy="subscription", fetch="EAGER")
     */
    public $identities;

订阅Identity.php

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

    /**
     * @ORM\ManyToOne(targetEntity="Subscription", inversedBy="identities")
     * @ORM\JoinColumn(name="subscription_id", referencedColumnName="id", nullable=false)
     */
    public $subscription;


    /**
     * @ORM\ManyToOne(targetEntity="Identity", inversedBy="subscriptions")
     * @ORM\JoinColumn(name="identity_id", referencedColumnName="id", nullable=true)
     */
    public $identity;

我有以下表格

class GeneralSettingsType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        $builder
            ....<snip>....
            ->add('identities', EntityType::class, [
                'label' => 'Who can view this subscription',
                // looks for choices from this entity
                'class' => Identity::class,
                //'placeholder' => 'Choose an option',
                // uses the User.username property as the visible option string
                'choice_label' => 'username',
                'multiple' => true,

这适用于为最终用户显示选项列表框 select 来自：

EntityType form field

当我保存我的表格时，我遇到了这个问题：

ORMInvalidArgumentException
HTTP 500 Internal Server Error
Expected value of type "App\Entity\**SubscriptionIdentity**" for association field
 "App\Entity\Subscription#$identities", got "App\Entity\Identity" instead.

请帮忙！在这种情况下，Symfony / Doctrine 文档并没有太大帮助。谢谢。

Answer 1

您收到此错误是因为您尝试将 Identity 类型的对象分配给一个属性，其中 doctrine waiting un object off type SubscriptionIdentity.

你这里描述的是多对多的关系。

尝试像这样修改您的实体：

class Subscription
{
    /**
     * @ORM\Column(type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    public $id;
    /**
     * @var bool
     * @ORM\Column(type="boolean")
     */

    /**
     * @var Collection
     * @ManyToMany(targetEntity="Identity")
     * @JoinTable(name="subscription_identity",
     *      joinColumns={@JoinColumn(name="subscription_id", referencedColumnName="id")},
     *      inverseJoinColumns={@JoinColumn(name="identity_id", referencedColumnName="id")}
     *      )
     */
    public $identities;

对比：https://www.doctrine-project.org/projects/doctrine-orm/en/2.6/reference/association-mapping.html#many-to-many-unidirectional

Symfony / Doctrine 2.x - 显示表单 EntityType::class 用户列表 - 保存@OneToMany - 错误

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php

doctrine

formbuilder

symfony

symfony4