调整迁移文件

db/migrate/20190309085449_migrate_course_members.rb

@@ -1,21 +1,21 @@
 class MigrateCourseMembers < ActiveRecord::Migration[5.2]
   def change
-    # add_column :course_groups, :position, :integer, default: 0
+    add_column :course_groups, :position, :integer, default: 0
-    #
+
-    # Course.find_each do |course|
+    Course.find_each do |course|
-    #   position = 1
+      position = 1
-    #   course.course_groups.reorder("CONVERT(course_groups.name USING gbk) COLLATE gbk_chinese_ci ASC").find_each do |group|
+      course.course_groups.reorder("CONVERT(course_groups.name USING gbk) COLLATE gbk_chinese_ci ASC").find_each do |group|
-    #     group.update_attribute(:position, position)
+        group.update_attribute(:position, position)
-    #     position += 1
+        position += 1
-    #   end
+      end
-    # end
+    end
-    #
+
-    #
+
-    # add_column :course_groups, :course_members_count, :integer, default: 0
+    add_column :course_groups, :course_members_count, :integer, default: 0
-    #
+
-    # CourseGroup.find_each do |g|
+    CourseGroup.find_each do |g|
-    #   CourseGroup.reset_counters g.id, :course_members
+      CourseGroup.reset_counters g.id, :course_members
-    # end
+    end
 
     ActiveRecord::Base.transaction do
       begin