没有分班的课堂不显示未分班

app/helpers/courses_helper.rb

@@ -246,6 +246,7 @@ module CoursesHelper
 
   def left_group_info course
     group_info = []
+    if course.course_groups_count > 0
       course.course_groups.each do |course_group|
         group_info << {category_id: course_group.id, category_name: course_group.name, position: course_group.position,
                        category_count: course_group.course_members_count, category_type: false,
@@ -256,5 +257,6 @@ module CoursesHelper
                      category_count: none_group_count, category_type: false,
                      second_category_url: "/courses/#{@course.id}/course_groups/0"}
     end
+  end
 
 end