的before_filter不調用方法，設置本地變量

Question

我想設置一個變量在我的before_filter，但總是得到錯誤「未定義的局部變量或方法‘問題’爲AnswersController」：

class AnswersController < ApplicationController 
     before_filter :get_question 

     def create 
      @answer = question.answers.new(params[:answer]) 
      @answer.user = current_user 
      @answer.save 
      flash[:notice] = 'Answer posted successfully.' 
      redirect_to request.referer 
     end 

      def get_question 
       question = Question.find(params[:question_id]) 
      end 
    end 

謝謝非常！

Answer 1

您需要使用@符號將其設爲實例變量。此外，您可能需要考慮將其轉化爲私人方法（見下文），因爲這很可能不是公共行爲。

class AnswersController < ApplicationController 
    before_filter :get_question 

    def create 
     @answer = @question.answers.new(params[:answer]) 
     @answer.user = current_user 
     @answer.save 
     flash[:notice] = 'Answer posted successfully.' 
     redirect_to request.referer 
    end 

    private 

    def get_question 
     @question = Question.find(params[:question_id]) 
    end 
end