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*SVN*
+* Added support for eagerly including polymorphic has_one associations. (closes #4525) [Rick]
+
+ class Post < ActiveRecord::Base
+ has_one :tagging, :as => :taggable
+ end
+
+ Post.find :all, :include => :tagging
+
* Added descriptive error messages for invalid has_many :through associations: going through :has_one or :has_and_belongs_to_many [Rick]
* Added support for going through a polymorphic has_many association: (closes #4401) [Rick]