19 lines
515 B
Ruby
19 lines
515 B
Ruby
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class HomeworkCommonTime < ActiveRecord::Migration
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def up
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count = StudentWork.all.count / 100 + 1
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transaction do
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for i in 1 ... count do i
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StudentWork.page(i).per(100).each do |homework|
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old_homework = HomeworkAttach.where(:user_id => homework.user_id, :name => homework.name, :description => homework.description).first
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if old_homework
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homework.update_column('created_at', old_homework.created_at)
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end
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end
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end
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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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