层次结构提供的产品视图为原本无序的产品集提供语义。

The view a hierarchy provides on the products in a catalog provides a semantic on an otherwise unordered set of products. Typical hierarchies include the following.

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根据工程目标，通过P 3ec软件经济合理的安排施工进度，完成产品视图。

P3EC software economy through reasonable arrangements for the construction progress to reach completion gravel project Jian 'an goal.

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例如，如果需要缓存产品视图，则必须在产品控制器的helpers数组中包含Cache。

For example, to cache the products views, you would have to include cache in the helpers array for the products controller.

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