19 lines
399 B
Ruby
19 lines
399 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, updated_at) NOT IN (
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SELECT poll_id, user_id, MAX(updated_at)
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FROM poll_votes
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GROUP BY poll_id, user_id
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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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