Let's look at an example of how to model a global function, using parse_line as an example.

让我们看一下怎样对一个通用函数建模的范例，使用parse_line作为例子。

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Your goal is to build a simple controller that will know which model and function to run, and then return a JSON object as a response that is usable on the far end of the transaction.

您的目标是构建这样一个简单的控制器：它知道应该运行哪个模型和函数，然后返回一个 JSON 对象作为响应，这个响应可用于事务的远端。

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In order to do this, the basic idea is to create a combined user-defined function that first invokes the model creation process and that then extracts the rules and returns them as a result set.

以此为目的，基本的想法是创建一个用户定义组合函数，此函数首先调用模型创建过程，之后再提取规则并将这些规则作为结果集返回。

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Then she set about designing a new model that could function as a hydroponic support system for the roses, able to withstand everything from wilting heat to high winds.

WSJ: The Kentucky Derby's Rose Queen

As a simplified model, Dr Page imagines a wave function for a whole universe (for these purposes, a universe can be considered as a single particle), from which two possible versions might be born.

ECONOMIST: The universe, it appears, may not be alone

Many will also now see his past Google (GOOG) success as a function of the AdWords business model and him being in the right place at the right time, rather than innate sales and leadership skill.

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