导入的分班未指定position

app/controllers/courses_controller.rb

@@ -890,7 +890,7 @@ class CoursesController < ApplicationController
               name = worksheet.cell(row, 1).to_s
 
               if @course.course_groups.where(:name => name).blank?
-                @course.course_groups << CourseGroup.new(:name => name)
+                @course.course_groups << CourseGroup.new(:name => name, :position => @course.course_groups_count + 1)
                 group_count += 1
               end
             end