使用alias_method_chain向控制器添加功能

Question

我正在使用alias_method_chain向控制器添加功能，但無法訪問參數。 這里params [：email]為nil

module Spree::MyExtensionUsersController


    def self.included(target)

        target.class_eval do
            alias_method_chain :create, :extra
        end

    end


    def create_with_extra

        #email comes from a form
        email = params[:email]

        do_something(email)
        create_without_extra
  end

end

Answer 1

嘗試使用before_filter ：

def self.included(target)
  target.send :before_filter, :do_something_with_email, :only => :create
end

def do_something_with_email
  #email comes from a form
  email = params[:email]

  do_something(email)
end