15 lines
686 B
Ruby
15 lines
686 B
Ruby
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class DeduplicateUserIdentities < ActiveRecord::Migration
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def change
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execute 'DROP TABLE IF EXISTS tt_migration_DeduplicateUserIdentities;'
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execute 'CREATE TABLE tt_migration_DeduplicateUserIdentities AS SELECT id,provider,user_id FROM identities;'
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execute 'DELETE FROM identities WHERE id NOT IN ( SELECT MIN(id) FROM tt_migration_DeduplicateUserIdentities GROUP BY user_id, provider);'
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execute 'DROP TABLE IF EXISTS tt_migration_DeduplicateUserIdentities;'
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end
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def down
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# This is an irreversible migration;
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# If someone is trying to rollback for other reasons, we should not throw an Exception.
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# raise ActiveRecord::IrreversibleMigration
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end
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end
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