在控制器之间共享一些before_filters

我有两个父控制器,一个用于API,另一个用于普通html页面。

class ApplicationController < ActionController::Base
    ...
end

class ApiController < ActionController::Metal
    include AbstractController::Callbacks
    ...
end

我想分享一些 before_filter 在两个控制器上。我尝试了这样的方法:

class ApplicationController < ActionController::Base
    include MyFilters
end

class ApiController < ActionController::Metal
    include MyFilters
end

module MyFilters
    before_filter :filter1
    before_filter :filter2

    def filter1
    end

    def filter2
    end
    ...
end

还有:

module MyFilters
    def self.included(klass)
        klass.before_filter :filter1
        klass.before_filter :filter2
    end

    def filter1
    end

    def filter2
    end
    ...
end

但在这两种情况下,我都收到:

undefined method `before_filter' for MyFilters:Module

实现这一点的正确方法是什么?