比较好的用户多角色控制,适用于用户角色不多的情况,最好5个以内_Ruby_编程开发_程序员俱乐部

?named_scope :email_is, lambda { |email|{? :conditions => (["USERBBSEMAIL = ? ",email] unless email.blank?? )}}

?

好处是不用再添加一个表.

? ROLES = {
????? '管理员' => 1,
????? '审核员' => 2,
????? '评分员' => 4
??? }
???
??? def reset_role
????? self.roles = 0
??? end

??? def add_role role
????? self.roles ^= role
??? end
???
??? def set_roles roles
????? self.roles = 0
????? roles && roles.each do |role|
??????? self.add_role role.to_i
????? end
??? end

??? def has_role? role
????? (self.roles & ROLES[role]) == ROLES[role]
??? end
???
??? def roles_for_show
????? roles = []
????? ROLES.each do |key,value|
??????? roles << key if self.has_role? key
????? end
????? roles.join(" ")
??? end