my application is using acts_as_tree to create a directed graph.
Everyone would work fine, except that nothing prevents the user to
create a circular reference:
>> item.parent=child
>> item.save
=> true>> child.parent=item
>> child.save
=> true
I checked in the database, and there it is: an item that has as parent
its own child!
item.parent_id = child_id
I know I could add code to prevent this from happening, but shouldn''t
that be the job of acts_as_tree ?
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