fruits_basket.rb

class Basket < ActiveRecord::Base
  has_many :fruits

  def apples
    fruits.where(type: 'Apple')
  end 

  def oranges
    fruits.where(type: 'Apple')
  end 

  def bananas
    fruits.where(type: 'Banana')
  end 
end

class Fruit < ActiveRecord::Base
   belongs_to :basket
end

class Apple < Fruit
end

class Orange < Fruit
end

class Banana < Fruit
end