methods:
  post:
    - "sf_guard_permission{name}"

names:
  sf_guard_permission{name}:
    required:     yes
    required_msg: Please, enter a name
    validators:   nameUniqueValidator

nameUniqueValidator: 
  class:          sfPropelUniqueValidator
  param:
    class:        sfGuardPermission
    column:       name
    unique_error: This permission name already exists