分班的学生列表

app/views/weapps/courses/students.json.jbuilder

@@ -1,5 +1,7 @@
 json.students student_list @students, @course.excellent
 json.students_count @students_count
-json.course_group do
-  json.(@course_group, :id, :name, :invite_code, :course_members_count)
+if @course_group
+  json.course_group do
+    json.(@course_group, :id, :name, :invite_code, :course_members_count)
+  end
 end