27 lines
621 B
Ruby
27 lines
621 B
Ruby
# frozen_string_literal: true
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class DeleteDuplicatePollVotes < ActiveRecord::Migration[7.0]
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def up
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execute <<~SQL
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DELETE FROM poll_votes
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WHERE (poll_id, user_id, poll_option_id) IN (
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SELECT pv.poll_id, pv.user_id, pv.poll_option_id
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FROM poll_votes pv
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JOIN polls p ON pv.poll_id = p.id
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WHERE p.type = 0
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AND EXISTS (
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SELECT 1
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FROM poll_votes pv2
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WHERE pv.poll_id = pv2.poll_id
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AND pv.user_id = pv2.user_id
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AND pv.created_at < pv2.created_at
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)
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);
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SQL
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end
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def down
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raise ActiveRecord::IrreversibleMigration
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end
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end
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