List#copy

list.rb

  def self.copy(lists, new_list_name, current_user)
  
    new_list = current_user.lists.create(:name => new_list_name)
      lists.each do |list|
        list.categories.find(:all, :conditions=>["categories.deleted_at is null or categories.deleted_at > '#{Time.now.strftime("%Y-%m-%d %H:%M:%S")}'"]).each do |category|
          new_category = new_list.categories.create(:name => category.name,
                                                  :user_id => category.user_id,
                                                  :position => category.position)
          category.items.find(:all, :conditions=>["items.deleted_at is null or items.deleted_at > '#{Time.now.strftime("%Y-%m-%d %H:%M:%S")}'"]).each do |item|
          new_category.items.create(:name => item.name,
                                    :description => item.description,
                                    :quantity => item.quantity,
                                    :size => item.size,
                                    :price => item.price,
                                    :position => item.position,
                                    :list_id => new_list.id,
                                    :user_id => item.user_id)
        end
      end
    end
    new_list
  end