ruby-on-rails - Fedex gem，多个包裹

Question

我正在尝试根据使用 Fedex gem 购买的产品总数计算运费 https://github.com/jazminschroeder/fedex .我正在获取费率，但我有不同的套餐选项，实际上有 3 个。数量为 1(小)时为第一个，数量为 2(中)时为第二，数量为 3 或 4(大)时为第三。

def packages_types
    packages = []
    if @order.quantity >= 4
      packages << { :weight => {:units => "LB", :value => @order.case_weight},
                    :dimensions => {:length => 8, :width => 1, :height => 7, :units => "IN" } }
    elsif @order.quantity == 2
      packages << { :weight => {:units => "LB", :value => 21},
                    :dimensions => {:length => 1, :width => 2, :height => 7, :units => "IN" } }
    elsif @order.quantity == 1
      packages << { :weight => {:units => "LB", :value => 10},
                    :dimensions => {:length => 1, :width => 2, :height => 2, :units => "IN" } }
    end
end

所以如果客户订购数量为 5。这将是 4 个(大)和 1 个小包装的包装。我在考虑使用 mod...

Answer 1

def packages_types
  packages              = []
  extra_items_count     = @order.quantity % 4
  large_packages_needed = (@order.quantity - extra_items_count) / 4

  # point A
  large_packages_needed.times do
    packages << { :weight     => { :units => "LB", :value => @order.case_weight },
                  :dimensions => { :length => 8, :width => 1, :height => 7, :units => "IN" } }
  end

  # point B
  case extra_items_count
  when 1
    packages << { :weight     => { :units => "LB", :value => 10 },
                  :dimensions => { :length => 1, :width => 2, :height => 2, :units => "IN" } }
  when 2
    packages << { :weight     => { :units => "LB", :value => 21 },
                  :dimensions => { :length => 1, :width => 2, :height => 7, :units => "IN" } }
  when 3, 4
    packages << { :weight     => { :units => "LB", :value => @order.case_weight },
                  :dimensions => { :length => 8, :width => 1, :height => 7, :units => "IN" } }
  end

  return packages
end

A 点:对于每组 4 个项目，需要一个大包(并添加到 packages 数组)。

B点:对于剩余商品(例如:您订购了5件商品-> 1个大包4件+1个小包剩余1件)，我们在package数组中添加对应的条件.