In the code below, p.comments.foobar calls #foobar on every comment.
Is there a way to call #foobar only on the comments that belong to
post "p"?

--------------------
class Comment < ActiveRecord::Base
  belongs_to :post

  def self.foobar; end
end

class Post < ActiveRecord::Base
  has_many :comments
end

p = Post.find_by_id 123
p.comments.foobar
--------------------

Thanks,
Nick

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