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具体角色名称在用户模式中的独特性?
原标题:Validate uniqueness of specific role name in user model?
add_column :users, :role, :string

class User < ActiveRecord::Base
  attr_accessible :email, :password, :remember_me, :username
  devise :database_authenticatable, ................
  validates_uniqueness_of :username, :email
  before_create :setup_default_role_for_new_users
  ROLES = %w[admin default banned]

  private
  def setup_default_role_for_new_users
    if self.role.blank?
      self.role = "default"
    end
  end
end

我是否可以具体确认我的<代码>:role栏中的名称? 我要发挥我独特的“<条码>行政”作用,因此我可以证明它不会因为安全原因而再次使用。

最佳回答

如果你只发挥行政作用,你可以做这样的事情:

validates_uniqueness_of :name, :if => lambda {|user| user.role ==  admin  }

如果事情开始变得更加复杂,你可以探讨使用单一表格的独一无二之处,将各类用户的逻辑划分为单独的类别。

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