选题详情判断用户是否选择了其他选题

app/controllers/graduation_topics_controller.rb

@@ -45,6 +45,10 @@ class GraduationTopicsController < ApplicationController
         end
     ## 分页参数
     @current_user = current_user
+    user_graduation_topics = @course.student_graduation_topics.where(user_id: current_user.id,
+                                                                     status: [0, 1],
+                                                                     graduation_topic_id: @graduation_topic.pluck(:id))
+    @user_selected = user_graduation_topics.size > 0
     page  = params[:page]  || 1
     limit = params[:limit] || 50
     @users_count = @student_graduation_topics.try(:count).to_i

app/views/graduation_topics/show.json.jbuilder

@@ -8,6 +8,7 @@ json.users_count @users_count
 json.course_identity @current_user.course_identity(@course)
 json.user_selected_topic @graduation_topic.user_status(current_user.id)
 json.group_list @course.teacher_group(current_user.id)
+json.user_selected @user_selected
 
 # 列表数据
 json.users_list do