防御性编程与让断言位于您代码中的正确位置密切相关。
Defensive programming is all about having assertions at the right place in your code.
返回命令行，在app目录中，您可以针对paintbrush执行一个grep，检查是否有其他位置可能包含相关代码。
Going back to the command line, in the app directory, you can perform a grep for paintbrush to check if there is any other place that could contain the relevant code.
帮助您理解更改一个数据库对象对应用程序的影响，并将您指引到源代码中相关的位置，以防出错。
Prevent errors by enabling you to understand the impact that changing a database object has on the application and directing you to the relevant place in the source code.
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