comment.rb

# == Schema Info
#
# Table name: comments
#
#  id               :integer
#  author           :string
#  email            :string
#  comment          :text
#  post_id          :integer
#  created_at       :datetime
#  updated_at       :datetime
#
class Comment < ActiveRecord::Base
    belongs_to :post
end

post.rb

# == Schema Info
#
# Table name: posts
#
#  id               :integer
#  title            :string
#  content          :text
#  created_at       :datetime
#  updated_at       :datetime
#
class Post < ActiveRecord::Base
    has_many :comments
end