socialforge/db/migrate/20140704034832_clear_course...

17 lines
495 B
Ruby

class ClearCourseStatus < ActiveRecord::Migration
def up
# 删除重复的课程状态
# 之前做迁移的时候未加验证可能引起此问题
courseidlist = "(-1"
CourseStatus.all.each do |status|
sql = "delete from course_statuses where course_id=" + status.course_id.to_s + " and id<>" + status.id.to_s +
" and course_id not in " +courseidlist + ")"
courseidlist += "," + status.course_id.to_s;
execute(sql)
end
end
def down
end
end