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