你在Auth
中申报的USER_KEY
个(甚至是有条件的)在全局被称为Auth::USER_KEY
.虽然include modules can以非完全限定的方式引用密钥,但它不会"混入"到包含模块中.
如果您希望每个包含模块(例如ApplicationController
)能够定义自己的USER_KEY
,请try 以下方法:
module Auth
DEFAULT_USER_KEY = 'user'
def self.included(base)
unless base.const_defined?(:USER_KEY)
base.const_set :USER_KEY, Auth::DEFAULT_USER_KEY
end
end
def authorize
user_id = session[self.class.const_get(:USER_KEY)]
end
end
class ApplicationController < ActionController::Base
USER_KEY = 'my_user'
include Auth
end
不过,如果你要遇到这些麻烦,不妨把它变成一个类方法:
module Auth
DEFAULT_USER_KEY = 'user'
def self.included(base)
base.extend Auth::ClassMethods
base.send :include, Auth::InstanceMethods
end
module ClassMethods
def user_key
Auth::DEFAULT_USER_KEY
end
end
module InstanceMethods
def authorize
user_id = session[self.class.user_key]
end
end
end
class ApplicationController < ActionController::Base
def self.user_key
'my_user'
end
end
或类级访问器:
module Auth
DEFAULT_USER_KEY = 'user'
def self.included(base)
base.send :attr_accessor :user_key unless base.respond_to?(:user_key=)
base.user_key ||= Auth::DEFAULT_USER_KEY
end
def authorize
user_id = session[self.class.user_key]
end
end
class ApplicationController < ActionController::Base
include Auth
self.user_key = 'my_user'
end