分班的position迁移

db/migrate/20200114062353_migrate_coures_member_group.rb

@@ -11,8 +11,8 @@ class MigrateCouresMemberGroup < ActiveRecord::Migration[5.2]
         if CourseGroup.where(course_id: course.id, name: member.course_group_name).exists?
           new_group = CourseGroup.where(course_id: course.id, name: member.course_group_name).first
         else
-          position = CourseGroup.where(course_id: course.id).order("position desc").first&.position.to_i + 1
-          new_group = course.course_groups.create!(name: member.course_group_name, position: position)
+          # position = CourseGroup.where(course_id: course.id).order("position desc").first&.position.to_i + 1
+          new_group = course.course_groups.create!(name: member.course_group_name)
           course.exercise_group_settings.where(course_group_id: member.course_group_id).update_all(course_group_id: new_group.id)
           course.attachment_group_settings.where(course_group_id: member.course_group_id).update_all(course_group_id: new_group.id)
           HomeworkGroupReview.where(homework_common_id: course.homework_commons.pluck(:id)).where(course_group_id: member.course_group_id).update_all(course_group_id: new_group.id)

db/migrate/20200114071420_migrate_course_group_member_count.rb

@@ -0,0 +1,4 @@
+class MigrateCourseGroupMemberCount < ActiveRecord::Migration[5.2]
+  def change
+  end
+end

db/migrate/20200114071917_migrate_coure_group_position.rb

@@ -0,0 +1,14 @@
+class MigrateCoureGroupPosition < ActiveRecord::Migration[5.2]
+  def change
+    course_ids = [377, 657, 715, 777, 973, 1093, 1131, 1180, 1309, 1920, 2037, 2346, 2354, 2493, 2752, 2920, 3000,
+                  3141, 3240, 3350, 3351, 3353, 3387, 3533, 3796]
+
+    courses = Course.where(id: course_ids)
+
+    courses.each do |course|
+      CourseGroup.where(coures_id: course.id).reorder("position ASC, CONVERT(course_groups.name USING gbk) COLLATE gbk_chinese_ci ASC").each_with_index do |group, index|
+        group.update!(position: index+1)
+      end
+    end
+  end
+end