Symfony2 build form have database field values repeated validation

Although the Symfony did not find the verification of the instructions, but after all, is the first project with Symfony, not very familiar.

Only these validation types are found in the documentation: Notblank,blank,notnull,null,true,false,type.

I have a non-ID primary key, but the field validation is not repeatable.

Who can share some of their familiar implementations?

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Although the Symfony did not find the verification of the instructions, but after all, is the first project with Symfony, not very familiar.

Only these validation types are found in the documentation: Notblank,blank,notnull,null,true,false,type.

I have a non-ID primary key, but the field validation is not repeatable.

Who can share some of their familiar implementations?

For example, author object's email field plus uniqueness Check (YAML format, other format configuration can refer to the document)

# src/Acme/UserBundle/Resources/config/validation.ymlAcme\UserBundle\Entity\Author:    constraints:        - Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity: email

Document: Http://symfony.com/doc/current/reference/constraints/UniqueEntity.html

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