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I have my models setup like so: class User < ActiveRecord::Base has_many :posts, :foreign_key => 'author_id' end class Post < ActiveRecord::Base belongs_to :author, :class_name => 'User' end Assuming: p = Post.first # just any post instance a = User.first # any user instance Now this piece of code is acting very weird p.author = a After setting the author, the attribute author_id of the post should be set to the id of the user. But this isn't happening. I tried using models with belongs_to that does not have the class_name parameter and everything works as expected. Now, one more thing that makes it weirder is that when I change the association to belongs_to :author, :class_name => 'User', :foreign_key => 'author_id' , it surprisingly works. Is this a bug in Rails 3.0.9? Shouldn't the foreign key parameter be unnecessary because as the docs say, its default value is the name of the association appended with _id . Also note that even without :foreign_key => 'author_id' , everything else regarding the association works as expected. (Like fetching the associated model) The only thing not working is the setter method not setting the foreign key. I know I could just do p.author_id = a.id or just add :foreign_key params to all my associations with class_name , but I prefer the more elegant syntax of p.author = a

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