Symfony2 构建表单有数据库字段值重复验证吗
Symfony里虽然没找到这个验证的说明，但是毕竟是用symfony做的第一个项目，不太熟。
文档中只找到这些验证类型：NotBlank，Blank，NotNull，Null，True,False,Type..
我有一个非id主键，但是不可重复的字段验证。
谁能分享一些自己熟知的实现方法？
回复内容：
Symfony里虽然没找到这个验证的说明，但是毕竟是用symfony做的第一个项目，不太熟。
文档中只找到这些验证类型：NotBlank，Blank，NotNull，Null，True,False,Type..
我有一个非id主键，但是不可重复的字段验证。
谁能分享一些自己熟知的实现方法？
贴个例子，Author对象的email字段加唯一性校验（yaml格式，其他格式的配置可以参考文档）
<code># src/Acme/UserBundle/Resources/config/validation.yml
Acme\UserBundle\Entity\Author:
constraints:
- Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity: email
</code>文档：http://symfony.com/doc/current/reference/constraints/UniqueEntity.html
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