解决方法
让我稍稍混淆水.我更喜欢通过Role表和连接表UserRole.这样我就可以定义多个角色而无需向db添加另一个列/表.
class User
has_many :user_roles
has_many :roles,:through => :user_roles
def role?(role)
role_names.include? role
end
def role_names
@role_names ||= self.roles.map(&:name)
end
def role=(role)
self.roles << Role.find_or_create_by_name(role)
end
end
class UserRole
# integer: user_id,integer: role_id
belongs_to :user
belongs_to :role
end
class Role
# string: name
has_many :user_roles
has_many :users,:through => :user_roles
end