由 app/helpers/pages_helper.rb 中的 helper 函数来完成这一工作，从而保持视图的最小化（请参阅 清单 12）。

A helper function in app/helpers/pages_helper.rb does the heavy lifting, keeping the view minimal (see Listing 12).

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它使所需的代码量最小化，因为它有许多内置功能，这样您就不再需要为这些功能编写客户端函数或对象了。

It minimizes the code you need to write, because it has many built-in features that you would otherwise need to write custom functions or objects for.

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第20行的目标函数要对食物的总体成本实现最小化，该值是每个决策变量(食物数量)乘以每单位食物成本的结果。

The objective function on line 20 minimizes the total food cost as the total of each decision variable (amount of food) multiplied by that food's cost per unit.

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