作品列表-分班过滤：点击“请选择分班”过滤显示所有学生

app/controllers/student_work_controller.rb

@@ -389,6 +389,13 @@ class StudentWorkController < ApplicationController
         else
           student_in_group = '(' + none_group_students.map{ |member| member.user_id }.join(',')  + ')'
         end
+      elsif @group == "-1"
+        all_group_students = @course.members.select{ |member| member.course_group_id }
+        if all_group_students.empty?
+          student_in_group = '(0)'
+        else
+          student_in_group = '(' + all_group_students.map{ |member| member.user_id }.join(',')  + ')'
+        end
       else
         course_group = CourseGroup.find_by_id(@group)
         group_students = course_group.users