On Monday, March 27, 2017 at 7:45:43 PM UTC-7, Aryk Grosz wrote:
>
>
> http://edgeguides.rubyonrails.org/association_basics.html#options-for-has-one-dependent
>
> Is there an equivalent for this in SQL. Seems like the right place for
> this would be in the AssociationDependencies plugin, but I dont see it
> there.
>
In SQL, the equivalent would be a foreign key constraint. So as long as
you setup foreign keys correctly in your database, an exception will be
raised if you try to delete a row referenced by an existing row.
If you want this to happen in Sequel::Model before a DELETE statement is
sent to the database, you could do:
def before_destroy
cancel_action("still has associated objects") unless
association_dataset.empty?
super
end
I suppose support for this could be added to the association_dependencies
plugin, if someone wants to submit a patch with specs.
Thanks,
Jeremy
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