how to write AR query to just show orders with a delivery date for an item

gistfile1.txt

class UnfulfilledOrder < ActiveRecord::Base
  belongs_to :shop
  has_many :items, :dependent => :delete_all
end

class Item < ActiveRecord::Base
  belongs_to :unfulfilled_orders
  has_many :deliveries, :dependent => :delete_all
end

class Delivery < ActiveRecord::Base
  belongs_to :items
                                                                  
  def self.has_delivery? date
    find_by_delivery_date(date)
  end
  
  def self.current date
    where("delivery_date = ? ", date)
  end
  
end