October 25, 2016 09:36
diff --git a/answer.rb b/answer.rb
 class Answer < ApplicationRecord
  has_one :reply, dependent: :destroy
  has_one :student, through: :replies
 end
diff --git a/reply.rb b/reply.rb
 class Reply < ApplicationRecord
  belongs_to :reply
  belongs_to :student
 end
diff --git a/student.rb b/student.rb
 class Student < ApplicationRecord
  has_many :replies, dependent: :destroy
  has_many :answers, through: :replies
 end
	class Answer < ApplicationRecord
	has_one :reply, dependent: :destroy
	has_one :student, through: :replies
	end
	class Reply < ApplicationRecord
	belongs_to :reply
	belongs_to :student
	end
	class Student < ApplicationRecord
	has_many :replies, dependent: :destroy
	has_many :answers, through: :replies
	end