Hi,

 I have two models: Parent and Child.

 Whenever Parent is deleted, children will be cleaned up with help of
cascade rules.

 However, I would also like to delete parent if there are no children left.

 Right now, I'm thinking about ON DELETE trigger on Child table, running
query to calculate number of children left and issuing DELETE query over
Parent.

 Is there better way to do it? Maybe without database-specific triggers?

Thanks,
Serge.

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