gistfile1.txt

def check_and_update_kitcheners
    if params.has_key?(:restaurant_shop)

      related_properties_params = Array.new
      params[:restaurant_shop].each do |restaurant_shop_id, person_ids|
        person_ids.each do |person_id|
          kitchener_obj = {person_id: person_id, restaurant_shop_id: restaurant_shop_id}
          related_properties_params.push kitchener_obj
        end
      end

      existing_properties = @kitcheners

      if related_properties_params.nil? || !related_properties_params.any?
        existing_properties.each do |property|
          property.delete
        end
      else
        to_delete = []
        existing = []

        existing_properties.each do |property|
          exist_kitchener = {person_id: property.person_id, restaurant_shop_id: property.restaurant_shop_id}
          existing.push exist_kitchener

          if !related_properties_params.include? exist_kitchener
            to_delete.push exist_kitchener
          end
        end

        to_add = related_properties_params - existing

        to_delete.each do |property|
          @kitcheners.find_by(person_id: property[:person_id], restaurant_shop_id: property[:restaurant_shop_id]).delete
        end

        to_add.each do |property|
          kitchener = @kitcheners.find_by(person_id: property[:person_id], restaurant_shop_id: property[:restaurant_shop_id])
          if kitchener.nil?
            kitchener = @kitcheners.new
            kitchener.person_id = property[:person_id]
            kitchener.restaurant_shop_id = property[:restaurant_shop_id]
            kitchener.save
          end
        end
      end
    end
  end