Ruby on Rails: Association of Ac

# 1:1 Relationclass Apple < ActiveRecord::Base  has_one :bananaendclass Banana < ActiveRecord::Base  belongs_to :appleend# 1:N Relationclass Apple < ActiveRecord::Base  has_many :bananasendclass Banana < ActiveRecord::Base  belongs_to :appleend# M:N Relationclass Apple < ActiveRecord::Base  has_and_belongs_to_many :bananasendclass Banana < ActiveRecord::Base  has_and_belongs_to_many :applesend