24 lines
836 B
Ruby
24 lines
836 B
Ruby
class DeleteOrphanNotificationSettings < ActiveRecord::Migration
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DOWNTIME = false
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def up
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execute("DELETE FROM notification_settings WHERE EXISTS (SELECT true FROM (#{orphan_notification_settings}) AS ns WHERE ns.id = notification_settings.id)")
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end
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def down
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# This is a no-op method to make the migration reversible.
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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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def orphan_notification_settings
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<<-SQL
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SELECT notification_settings.id
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FROM notification_settings
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LEFT OUTER JOIN namespaces
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ON namespaces.id = notification_settings.source_id
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WHERE notification_settings.source_type = 'Namespace'
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AND namespaces.id IS NULL
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SQL
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end
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end
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