删除问卷（未完）

app/controllers/exercise_controller.rb

@@ -158,7 +158,7 @@ class ExerciseController < ApplicationController
       question.question_number -= 1
       question.save
     end
-    if @poll_question && @poll_question.destroy
+    if @exercise_question && @exercise_question.destroy
       respond_to do |format|
         format.js
       end