Automatically extend the class which gets a module included with the ClassMethods module if it exists #970 [Lucas Carlson]

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Fixed acts_as_list to trigger remove_from_list on destroy after the fact, not before, so a unique position can be maintained #871 [Alisdair McDiarmid]

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Fixed default scope of acts_as_list from "1" to "1 = 1", so itll work in PostgreSQL (among other places) #427 [Alexey]

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Renamed Mixins to Acts to resemble the change from include ActiveRecord::Mixins::List to acts_as_list and renamed @@default_error_messagess to @@default_error_messages

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Added assumption that a Symbol-based scope should end in _id unless it does so already and that you can pass vanilla string-based scopes as a parameter

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Added that Active Records will automatically record creation and/or update timestamps of database objects if fields of the names created_at/created_on or updated_at/updated_on are present. [Tobias Luetke] Added acts_as_tree that can decorates an existing class with a many to many relationship with itself. Added acts_as_list that can decorates an existing class with methods like move_higher/lower, move_to_top/bottom.

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Added ActiveRecord::Mixins::List that can decorates an existing class with methods like move_higher/lower, move_to_top/bottom

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