rails的before_filter，如果except子controller中的action skip_filter

如题，在http://stackoverflow.com/questions/2390178/skip-before-filter-in-rails 找到了答案。

 

问：

I have three controllers: dog , cat , and horse . These controllers all inherit from the controller animal . In the controller animal , I have a before filter that authenticates a user as such:

before_filter :authenticate

def authenticate
  authenticate_or_request_with_http_basic do |name, password|
    name == "foo" && password == "bar"
  end
end

 


In the show action of dog , I need to have open access to all users (skip the authentication).

If I were to write the authentication separately for dog , I could do something like this:

before_filter :authenticate, :except => :show

 


But since dog inherits from animal , I do not have access to the controller-specific actions. Adding :except => :show in the animal controller will not only skip authentication for the show action of dog , but also that of cat and horse . This behavior is not desired.

How can I skip the authentication only for the show action of dog while still inheriting from animal ?

 

答：

class Dog < Animal
  skip_before_filter :authenticate
end

  

See ActionController::Filters::ClassMethods for more info on filters and inheritance.