2016-05-11 14:28:13 +08:00
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class MergeTwoHomeworks < ActiveRecord::Migration
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def up
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student_works = StudentWork.where("homework_common_id = 3387 and user_id in (11256, 11259, 11252, 11499)")
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unless student_works.nil?
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student_works.each do |work|
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work.update_column('homework_common_id', 3463)
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end
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end
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2016-05-11 15:06:12 +08:00
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homework = HomeworkCommon.find 3387
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homework.destroy if homework
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2016-05-11 14:28:13 +08:00
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stu_works = StudentWork.where("homework_common_id = 3387")
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stu_work_ids = stu_works.empty? ? "(-1)" : "(" + stu_works.map{|work| work.id}.join(',') + ")"
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stu_work_tests = StudentWorkTest.where("student_work_id in #{stu_work_ids}")
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stu_work_tests.destroy_all if stu_work_tests
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stu_works.destroy_all if stu_works
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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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