自定 validation与validates

validates :roles, presence: true
#validates :innergroups, presence: true, :if => :need_roles_groups?
validate :expiration

def expiration
unless self.roles.blank?
self.roles.each do |role|
roles = ['2','3','4','5','9']
if roles.include? role
if self.innergroups?
if !self.innergroups[Role.find(role).name.to_s].present?
errors.add(:innergroups, "不能为空 => [#{I18n.t(Role.find(role).name)}]")
end
else
errors.add(:innergroups, "不能为空 => [#{I18n.t(Role.find(role).name)}]")
end
end
end
end
end