Php Symfony表单：在持久化到数据库之前将ID转换回实体

我有一个用户实体和一个角色实体，它们之间有多对多映射。在显示处理新用户创建的HTML表单时，我列出了可以根据以下代码片段分配给用户的可用角色（我实现了_toString（）函数以正确显示角色）

至少在正确显示可用角色以及选择应分配给用户的角色的复选框的情况下，这是有效的每个复选框的值都指向该角色的ID。

/**
 * @ORM\Table(name="User")
 * @ORM\Entity(repositoryClass="Acme\UserBundle\Entity\UserRepository")
 */
class User implements AdvancedUserInterface
{
    /**
     * @ORM\Column(type="guid")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="UUID")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=25, unique=true)
     */
    private $username;

    /**
     * @ORM\Column(type="string", length=64)
     */
    private $password;

    /**
     * @ORM\ManyToMany(targetEntity="Role", inversedBy="users")
     * @ORM\JoinTable(name="User_Role")
     * @Assert\Type(type="Acme\UserBundle\Entity\Role")
     */
    private $roles;

    public function __construct()
    {
        $this->roles = new ArrayCollection();
    }

    /**
     * @inheritDoc
     */
    public function getUsername()
    {
        return $this->username;
    }

    /**
     * @inheritDoc
     */
    public function getPassword()
    {
        return $this->password;
    }

    /**
     * @inheritDoc
     */
    public function getRoles()
    {
        return $this->roles->toArray();
    }

    /**
     * @inheritDoc
     */
    public function eraseCredentials()
    {
    }

    /**
     * @inheritDoc
     */
    public function isAccountNonExpired()
    {
        return true;
    }

    /**
     * @inheritDoc
     */
    public function isAccountNonLocked()
    {
        return true;
    }

    /**
     * @inheritDoc
     */
    public function isCredentialsNonExpired()
    {
        return true;
    }

    /**
     * @inheritDoc
     */
    public function isEnabled()
    {
        return true;
    }

    /**
     * Get id
     *
     * @return guid
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set username
     *
     * @param string $username
     * @return User
     */
    public function setUsername($username)
    {
        $this->username = $username;

        return $this;
    }

    /**
     * Set password
     *
     * @param string $password
     * @return User
     */
    public function setPassword($password)
    {
        $this->password = $password;

        return $this;
    }

    /**
     * Add roles
     *
     * @param Role $roles
     * @return User
     */
    public function addRole(Role $roles)
    {
        $this->roles[] = $roles;

        return $this;
    }

    /**
     * Remove roles
     *
     * @param Role $roles
     */
    public function removeRole(Role $roles)
    {
        $this->roles->removeElement($roles);
    }
}

但是，当我选中其中一个复选框并尝试保存表单时，我收到以下错误：

This value should be of type Acme\UserBundle\Entity\Role.

显然，问题在于我只是提交角色的ID，在PHP代码中的某个地方，我需要获取这些ID并将其转换为实际实体，而不是试图保存ID本身。我该怎么做，在哪里做

为了完整起见，我将当前代码包括在下面：

User.php

/**
 * @ORM\Table(name="User")
 * @ORM\Entity(repositoryClass="Acme\UserBundle\Entity\UserRepository")
 */
class User implements AdvancedUserInterface
{
    /**
     * @ORM\Column(type="guid")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="UUID")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=25, unique=true)
     */
    private $username;

    /**
     * @ORM\Column(type="string", length=64)
     */
    private $password;

    /**
     * @ORM\ManyToMany(targetEntity="Role", inversedBy="users")
     * @ORM\JoinTable(name="User_Role")
     * @Assert\Type(type="Acme\UserBundle\Entity\Role")
     */
    private $roles;

    public function __construct()
    {
        $this->roles = new ArrayCollection();
    }

    /**
     * @inheritDoc
     */
    public function getUsername()
    {
        return $this->username;
    }

    /**
     * @inheritDoc
     */
    public function getPassword()
    {
        return $this->password;
    }

    /**
     * @inheritDoc
     */
    public function getRoles()
    {
        return $this->roles->toArray();
    }

    /**
     * @inheritDoc
     */
    public function eraseCredentials()
    {
    }

    /**
     * @inheritDoc
     */
    public function isAccountNonExpired()
    {
        return true;
    }

    /**
     * @inheritDoc
     */
    public function isAccountNonLocked()
    {
        return true;
    }

    /**
     * @inheritDoc
     */
    public function isCredentialsNonExpired()
    {
        return true;
    }

    /**
     * @inheritDoc
     */
    public function isEnabled()
    {
        return true;
    }

    /**
     * Get id
     *
     * @return guid
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set username
     *
     * @param string $username
     * @return User
     */
    public function setUsername($username)
    {
        $this->username = $username;

        return $this;
    }

    /**
     * Set password
     *
     * @param string $password
     * @return User
     */
    public function setPassword($password)
    {
        $this->password = $password;

        return $this;
    }

    /**
     * Add roles
     *
     * @param Role $roles
     * @return User
     */
    public function addRole(Role $roles)
    {
        $this->roles[] = $roles;

        return $this;
    }

    /**
     * Remove roles
     *
     * @param Role $roles
     */
    public function removeRole(Role $roles)
    {
        $this->roles->removeElement($roles);
    }
}

Role.php

/**
 * @ORM\Table(name="User")
 * @ORM\Entity(repositoryClass="Acme\UserBundle\Entity\UserRepository")
 */
class User implements AdvancedUserInterface
{
    /**
     * @ORM\Column(type="guid")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="UUID")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=25, unique=true)
     */
    private $username;

    /**
     * @ORM\Column(type="string", length=64)
     */
    private $password;

    /**
     * @ORM\ManyToMany(targetEntity="Role", inversedBy="users")
     * @ORM\JoinTable(name="User_Role")
     * @Assert\Type(type="Acme\UserBundle\Entity\Role")
     */
    private $roles;

    public function __construct()
    {
        $this->roles = new ArrayCollection();
    }

    /**
     * @inheritDoc
     */
    public function getUsername()
    {
        return $this->username;
    }

    /**
     * @inheritDoc
     */
    public function getPassword()
    {
        return $this->password;
    }

    /**
     * @inheritDoc
     */
    public function getRoles()
    {
        return $this->roles->toArray();
    }

    /**
     * @inheritDoc
     */
    public function eraseCredentials()
    {
    }

    /**
     * @inheritDoc
     */
    public function isAccountNonExpired()
    {
        return true;
    }

    /**
     * @inheritDoc
     */
    public function isAccountNonLocked()
    {
        return true;
    }

    /**
     * @inheritDoc
     */
    public function isCredentialsNonExpired()
    {
        return true;
    }

    /**
     * @inheritDoc
     */
    public function isEnabled()
    {
        return true;
    }

    /**
     * Get id
     *
     * @return guid
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set username
     *
     * @param string $username
     * @return User
     */
    public function setUsername($username)
    {
        $this->username = $username;

        return $this;
    }

    /**
     * Set password
     *
     * @param string $password
     * @return User
     */
    public function setPassword($password)
    {
        $this->password = $password;

        return $this;
    }

    /**
     * Add roles
     *
     * @param Role $roles
     * @return User
     */
    public function addRole(Role $roles)
    {
        $this->roles[] = $roles;

        return $this;
    }

    /**
     * Remove roles
     *
     * @param Role $roles
     */
    public function removeRole(Role $roles)
    {
        $this->roles->removeElement($roles);
    }
}

<?php

/**
 * @ORM\Table(name="Role")
 * @ORM\Entity()
 */
class Role implements RoleInterface
{
    /**
     * @ORM\Column(name="id", type="guid")
     * @ORM\Id()
     * @ORM\GeneratedValue(strategy="UUID")
     */
    private $id;

    /**
     * @ORM\Column(name="name", type="string", length=30)
     */
    private $name;

    /**
     * @ORM\Column(name="role", type="string", length=20, unique=true)
     */
    private $role;

    /**
     * @ORM\ManyToMany(targetEntity="User", mappedBy="roles")
     * @ORM\JoinTable(name="User_Role")
     */
    private $users;

    public function __construct()
    {
        $this->users = new ArrayCollection();
    }

    public function __toString()
    {
        return $this->name;
    }

    /**
     * @see RoleInterface
     */
    public function getRole()
    {
        return $this->role;
    }

    /**
     * Get id
     *
     * @return guid
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set name
     *
     * @param string $name
     * @return Role
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string 
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Set role
     *
     * @param string $role
     * @return Role
     */
    public function setRole($role)
    {
        $this->role = $role;

        return $this;
    }

    /**
     * Add users
     *
     * @param User $users
     * @return Role
     */
    public function addUser(User $users)
    {
        $this->users[] = $users;

        return $this;
    }

    /**
     * Remove users
     *
     * @param User $users
     */
    public function removeUser(User $users)
    {
        $this->users->removeElement($users);
    }

    /**
     * Get users
     *
     * @return \Doctrine\Common\Collections\Collection 
     */
    public function getUsers()
    {
        return $this->users;
    }
}

UserRepository.php

/**
 * @ORM\Table(name="User")
 * @ORM\Entity(repositoryClass="Acme\UserBundle\Entity\UserRepository")
 */
class User implements AdvancedUserInterface
{
    /**
     * @ORM\Column(type="guid")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="UUID")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=25, unique=true)
     */
    private $username;

    /**
     * @ORM\Column(type="string", length=64)
     */
    private $password;

    /**
     * @ORM\ManyToMany(targetEntity="Role", inversedBy="users")
     * @ORM\JoinTable(name="User_Role")
     * @Assert\Type(type="Acme\UserBundle\Entity\Role")
     */
    private $roles;

    public function __construct()
    {
        $this->roles = new ArrayCollection();
    }

    /**
     * @inheritDoc
     */
    public function getUsername()
    {
        return $this->username;
    }

    /**
     * @inheritDoc
     */
    public function getPassword()
    {
        return $this->password;
    }

    /**
     * @inheritDoc
     */
    public function getRoles()
    {
        return $this->roles->toArray();
    }

    /**
     * @inheritDoc
     */
    public function eraseCredentials()
    {
    }

    /**
     * @inheritDoc
     */
    public function isAccountNonExpired()
    {
        return true;
    }

    /**
     * @inheritDoc
     */
    public function isAccountNonLocked()
    {
        return true;
    }

    /**
     * @inheritDoc
     */
    public function isCredentialsNonExpired()
    {
        return true;
    }

    /**
     * @inheritDoc
     */
    public function isEnabled()
    {
        return true;
    }

    /**
     * Get id
     *
     * @return guid
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set username
     *
     * @param string $username
     * @return User
     */
    public function setUsername($username)
    {
        $this->username = $username;

        return $this;
    }

    /**
     * Set password
     *
     * @param string $password
     * @return User
     */
    public function setPassword($password)
    {
        $this->password = $password;

        return $this;
    }

    /**
     * Add roles
     *
     * @param Role $roles
     * @return User
     */
    public function addRole(Role $roles)
    {
        $this->roles[] = $roles;

        return $this;
    }

    /**
     * Remove roles
     *
     * @param Role $roles
     */
    public function removeRole(Role $roles)
    {
        $this->roles->removeElement($roles);
    }
}

<?php

/**
 * @ORM\Table(name="Role")
 * @ORM\Entity()
 */
class Role implements RoleInterface
{
    /**
     * @ORM\Column(name="id", type="guid")
     * @ORM\Id()
     * @ORM\GeneratedValue(strategy="UUID")
     */
    private $id;

    /**
     * @ORM\Column(name="name", type="string", length=30)
     */
    private $name;

    /**
     * @ORM\Column(name="role", type="string", length=20, unique=true)
     */
    private $role;

    /**
     * @ORM\ManyToMany(targetEntity="User", mappedBy="roles")
     * @ORM\JoinTable(name="User_Role")
     */
    private $users;

    public function __construct()
    {
        $this->users = new ArrayCollection();
    }

    public function __toString()
    {
        return $this->name;
    }

    /**
     * @see RoleInterface
     */
    public function getRole()
    {
        return $this->role;
    }

    /**
     * Get id
     *
     * @return guid
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set name
     *
     * @param string $name
     * @return Role
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string 
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Set role
     *
     * @param string $role
     * @return Role
     */
    public function setRole($role)
    {
        $this->role = $role;

        return $this;
    }

    /**
     * Add users
     *
     * @param User $users
     * @return Role
     */
    public function addUser(User $users)
    {
        $this->users[] = $users;

        return $this;
    }

    /**
     * Remove users
     *
     * @param User $users
     */
    public function removeUser(User $users)
    {
        $this->users->removeElement($users);
    }

    /**
     * Get users
     *
     * @return \Doctrine\Common\Collections\Collection 
     */
    public function getUsers()
    {
        return $this->users;
    }
}

---

在User.php中，在$roles变量上方，应删除以下断言：

@Assert\Type(type="Acme\UserBundle\Entity\Role")

---

$roles变量实际上是一个数组，而不是Role类型，因此验证失败。

我建议将UserType.php中的

buildForm

更改为以下内容，因为角色在ArrayCollection中不是单独的类型，或者我认为应该是数组（您可以检查您的实体以及返回的

getRoles（）

并将以下功能添加到您的角色实体中：

public function getRolesCollection()
{
    //this returns a collection
    return $this->roles;
}

我确信在角色实体中有下面的函数，它返回的是数组而不是角色的数组集合

public function getRoles()
{
    return $this->roles->toArray();
}

---

请记住，我的解决方案是，如果您想让表单生成器将角色添加为集合而不是数组，那么前面的答案对您也有帮助

如果您要将用户实体绑定到表单，则角色应自动转换为实体。您能发布保存表单所用的代码吗？还有-请你定义了你自己的数据转换器？我会用我正在使用的代码更新我的问题。另外，不，我还没有定义任何数据转换器。我需要吗？不，但如果你有，它可能会干扰自动转换。哦，我明白了。不，我使用了由Symfony和Doctrine自动生成的标准CRUD模板，并制作了一对例如，在Role.php中添加一个toString（）函数，并对表单输出进行一点自定义。我发现了。这是一个多么粗心的错误……现在将其添加为答案。感谢您让我走上正确的道路。现在我知道从ID到实际实体的转换是自动进行的。