我正在定义这个夹具：
Clanmovil\PlatformBundle\Entity\Alias:
alias_{1..500}:
name (unique): Alias_<numberBetween(1, 500)>
description: <text(150)>
active: <boolean(31)>
createdAt: <dateTimeThisYear()>
updatedAt: <dateTimeThisYear()>
我在控制台收到此错误：
[RuntimeException] 无法为 Clanmovil\PlatformBundle\Entity\Alias 生成随机唯一值：128 次尝试中的名称。
我通过这个错误对 bundle 的来源进行了一些研究，但我不清楚问题可能是什么。这里有什么问题？当我发现这样的问题时，我该如何处理？
如果这有帮助，这就是实体的样子：
namespace Clanmovil\PlatformBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Clanmovil\PlatformBundle\Model\IdentifierAutogeneratedTrait;
use Symfony\Component\Validator\Constraints as Assert;
use Gedmo\Timestampable\Traits\TimestampableEntity;
/**
* @ORM\Entity
* @ORM\Table(name="cm_alias",
* uniqueConstraints={@ORM\UniqueConstraint(name="name", columns={"name"})},
indexes={@ORM\Index(name="fulltext_idx",
columns={"name"},
flags={"fulltext"})})
* )
*/
class Alias
{
use IdentifierAutogeneratedTrait;
use TimestampableEntity;
/**
* @var string
* @ORM\Column(type="string", length=150)
* @Assert\NotBlank()
*/
protected $name;
/**
* @var string
* @ORM\Column(type="text", nullable=true)
*/
protected $description;
/**
* @var bool
* @ORM\Column(type="boolean")
*/
protected $active = true;
/**
* @ORM\ManyToMany(targetEntity="Command", mappedBy="command_alias", cascade={"persist"})
*/
protected $alias_command;
/**
* Set name.
*
* @param string $name
* @return Alias
*/
public function setName($name)
{
$this->name = $name;
return $this;
}
/**
* Get name.
*
* @return string
*/
public function getName()
{
return $this->name;
}
/**
* Set description.
*
* @param string $description
*
* @return Alias
*/
public function setDescription($description)
{
$this->description = $description;
return $this;
}
/**
* Get description.
*
* @return string
*/
public function getDescription()
{
return $this->description;
}
/**
* Set active.
*
* @param bool $active
*
* @return Category
*/
public function setActive($active)
{
$this->active = $active;
return $this;
}
/**
* Get active.
*
* @return bool
*/
public function getActive()
{
return $this->active;
}
/**
* Get command for alias
*
* @return string
*/
public function getAliasCommand()
{
return $this->alias_command;
}
public function __toString()
{
return $this->name;
}
}