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A nested set for DataMapper that actually works

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Octocat-spinner-32 lib
Octocat-spinner-32 spec
Octocat-spinner-32 tasks
Octocat-spinner-32 .gitignore
Octocat-spinner-32 Gemfile
Octocat-spinner-32 LICENSE
Octocat-spinner-32 README
Octocat-spinner-32 Rakefile
Octocat-spinner-32 TODO
Octocat-spinner-32 dm-is-awesome_set.gemspec

Yes, finally!  A nested_set for Datamapper that actually works!  .... at least
I _think_ it does. Please test this out and let me know at
if you run into any problems.  This readme will eventually have examples.  Until
then, check the RDoc's and you should be fine.

A quick note about discriminators:

This version enables scoping that can either include or ignore discriminators.
If you wish to scope by a discriminator, please include that column name in
the scope option. Otherwise this plugin will work with all rows regardless of
the discriminator column.

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