12 lines
287 B
Ruby
12 lines
287 B
Ruby
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class ClearCourseData < ActiveRecord::Migration
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def up
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# 清理课程表垃圾数据
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# 之前删除项目未删除课程的数据
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sql = 'delete from courses where name is null and extra not in (select identifier from projects)'
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execute(sql)
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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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