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In my admin for an object Chair I have a TabularInline for an arbitrary number of Desk objects. I want every Chair to always have at least one Desk object associated with it. Is there a way to make the admin interface force the user to enter at least one Desk? Like show an error if no Desk is entered?
Matthew Flanagan has a great example of how to require one valid form in a formset: http://code.google.com/p/wadofstuff/wiki/WadOfStuffDjangoForms and http://wadofstuff.blogspot.com/2009/08/requiring-at-least-one-inline-formset.html
Hope that helps you out.