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* Update child depth when parent node is moved. [Amanda Wagener]
* Added move_to_child_with_index. [Ben Zhang]
* Optimised self_and_descendants for when there's an index on lft. [Mark Torrance]
* Added support for an unsaved record to return the right 'root'. [Philip Arndt]
* Fixed regressions introduced. [Philip Arndt]
* Added 'depth' which indicates how many levels deep the node is.
This only works when you have a column called 'depth' in your table,
otherwise it doesn't set itself. [Philip Arndt]
* Rails 3.2 support added. [Gabriel Sobrinho]
* Oracle compatibility added. [Pikender Sharma]
* Adding row locking to deletion, locking source of pivot values, and adding retry on collisions. [Markus J. Q. Roberts]
* Added method and helper for sorting children by column. [bluegod]
* Fixed .all_roots_valid? to work with Postgres. [Joshua Clayton]
* Made compatible with polymorphic belongs_to. [Graham Randall]
* Added in the association callbacks to the children :has_many association. [Michael Deering]
* Modified helper to allow using array of objects as argument. [Rahmat Budiharso]
* Fixed cases where we were calling attr_protected. [Jacob Swanner]
* Fixed nil cases involving lft and rgt. [Stuart Coyle] and [Patrick Morgan]
* Fixed deprecation warning under Rails 3.1 [Philip Arndt]
* Converted Test::Unit matchers to RSpec. [Uģis Ozols]
* Added inverse_of to associations to improve performance rendering trees. [Sergio Cambra]
* Added row locking and fixed some race conditions. [Markus J. Q. Roberts]
* Fixed a bug with move_to not using nested_set_scope [Andreas Sekine]
* Expect Rails 3
* Changed how callbacks work. Returning false in a before_move action does not block save operations. Use a validation or exception in the callback if you need that.
* Switched to RSpec
* Remove use of Comparable