DMZ 1.7.1 (DataMapper OverZealous Edition)

[eluser]WanWizard[/eluser]
Yes, it does.

But currently it can't work if you have defined foreign key constrains on the tables. This is because it deletes the parent first, before it processes any relations.

Can you add a ticket for this issue at http://bitbucket.org/wanwizard/datamapper/issues, so I won't forget to have a look at it?

If possible, attach an sql file with the create commands for your posts_tags and related tables, including all constraint definitions, so I have something to test with.