rails,如何在功能上传递自我

class ExampleController < ApplicationController
  def index
    @params = {
      :param1 => 'value1',
      :param2 => 'value2'
    }
  end
end

<%= params[:param1] %>
<%= params[:param2] %>

class ExampleController < ApplicationController
  def index
    session[:param1] = 'value1'
    session[:param2] = 'value2'
  end
end

class AnotherController < ApplicationController
  def index
    @param1 = session[:param1]
    @param2 = session[:param2]
  end
end

class ExampleController < ApplicationController
  def index
    cookies[:param1] = 'value1'
    cookies[:param2] = 'value2'
  end
end

class AnotherController < ApplicationController
  def index
    @param1 = cookies[:param1]
    @param2 = cookies[:param2]
  end
end