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How to customize Rails 3 STI column name
class Post < ActiveRecord::Base
end

class Question < Post
end

class Answer < Post
end

class Post < ActiveRecord::Base
  self.inheritance_column = 'type_column_name'

end

class Post < ActiveRecord::Base
  scope :questions, where(:post_type_id => 0)
  scope :answers, where(:post_type_id => 1)

end

@questions = Post.questions.all
@answers = Post.answers.all