Constraints?

[mltsy]

It would be awesome if dm-is-tree was compatible with dm-constraints!
I was able to add a constraint to protect nodes with children by repeating the children relationship like this:

is :tree
has n, :children, :model => self, :child_key => :parent_id, :constraint => :protect

However, it would be much more convenient if one could simply say:

is :tree, :constraint => :protect