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class DeleteOrphanNotificationSettings < ActiveRecord::Migration[4.2]
DOWNTIME = false
def up
execute("DELETE FROM notification_settings WHERE EXISTS (SELECT true FROM (#{orphan_notification_settings}) AS ns WHERE ns.id = notification_settings.id)")
end
def down
# This is a no-op method to make the migration reversible.
# If someone is trying to rollback for other reasons, we should not throw an Exception.
# raise ActiveRecord::IrreversibleMigration
end
def orphan_notification_settings
<<-SQL
SELECT notification_settings.id
FROM notification_settings
LEFT OUTER JOIN namespaces
ON namespaces.id = notification_settings.source_id
WHERE notification_settings.source_type = 'Namespace'
AND namespaces.id IS NULL
SQL
end
end
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