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12 lines
789 B
12 lines
789 B
5 years ago
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class AddUniqIndexToEvaluationDistribution < ActiveRecord::Migration[5.2]
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def change
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sql = %Q(delete from student_works_evaluation_distributions where (user_id, student_work_id) in
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(select * from (select user_id, student_work_id from student_works_evaluation_distributions group by user_id, student_work_id having count(*) > 1) a)
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and id not in (select * from (select min(id) from student_works_evaluation_distributions group by user_id, student_work_id having count(*) > 1 order by id) b))
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ActiveRecord::Base.connection.execute sql
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add_index :student_works_evaluation_distributions, [:student_work_id, :user_id], name: "index_on_student_work_id_and_user_id", unique: true
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remove_index :student_works_evaluation_distributions, :user_id
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end
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end
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