局部未定义的局部变量

Question

我是新来的rails，我有点麻烦。我得到一个

undefined local variable or method `answer' 

在我的_answer.html.erb部分错误。

这里是我的answers_controller.rb：

class AnswersController < ApplicationController 
    before_action :set_answer, only: [:show, :edit, :update, :destroy] 


def index 
    @question = Question.find params[:question_id] 
    @question.answers 
end 


    def show 
    end 


def new 
    @question = Question.find params[:question_id] 
end 


def edit 
end 


    def create 
    @question = Question.find(params[:question_id]) 
    @answer = @question.answers.create(answer_params) 

    respond_to do |format| 
    if @answer.save 
    format.html { redirect_to @comment, notice: 'Answer was successfully created.' } 
    format.json { render action: 'show', status: :created, location: @answer } 
    else 
    format.html { render action: 'new' } 
    format.json { render json: @answer.errors, status: :unprocessable_entity } 
    end 
    end 
end 


    def update 
    respond_to do |format| 
     if @answer.update(answer_params) 
     format.html { redirect_to @answer, notice: 'Answer was successfully updated.' } 
    format.json { head :no_content } 
    else 
     format.html { render action: 'edit' } 
     format.json { render json: @answer.errors, status: :unprocessable_entity } 
    end 
    end 
end 


    def destroy 
    @answer.destroy 
    respond_to do |format| 
    format.html { redirect_to answers_url } 
    format.json { head :no_content } 
    end 
end 

和我_answer.html.erb文件：

<%=div_for(answer) do %> 
    <div class="questioncontainer"> 
    <p> 
    <%= answer.body %> 
    </p> 
    </div> 
    <% end %> 

如果它的事项，我的资源：答案嵌套在资源：问题。

我感谢任何帮助！

Answer 1

尝试使用div_for(@answer)而不是answer。当你在控制器和视图之间进行通信时，你总是用@variables这样做。也许你应该花点时间阅读：http://guides.rubyonrails.org/layouts_and_rendering.html