毕设选题报错

app/controllers/graduation_topics_controller.rb

@@ -24,8 +24,7 @@ class GraduationTopicsController < ApplicationController
     end
 
     # 当前用户是否已经选过题
-    user_graduation_topics = @course.student_graduation_topics.where(user_id: current_user.id, status: [0, 1])  #6.12 -hs
-    @user_selected = user_graduation_topics.size > 0
+    @user_selected = @course.student_graduation_topics.where(user_id: current_user.id, status: [0, 1]).count  > 0 #6.12 -hs
     ## 分页参数
     page  = params[:page]  || 1
     limit = params[:limit] || 15