When a client or supervisor dictates how a program should process well-formed input data, take the opportunity to agree in detail on how the program should act in case of error.
当客户或主管在指示程序应如何处理格式良好的输入数据时，抓住机会，对万一发生错误时程序的具体操作细节同他们达成共识。
If any user enters problematic data, we want to ensure that the list of error messages is displayed so that the user can correct the input data.
如果任何用户输入了有问题的数据，我们希望显示错误消息列表，让用户可以纠正输入数据。
In our Team Room example, if we want to list all input data error messages entered for a new subject, then we can add the following to the top of app \ views \ subjects \ _form.rhtml.
在Team Room示例中，如果希望列出为新主题输入的所有输入数据错误消息，可以在app \ views \ subjects \ _ form . rhtml的顶部添加以下代码。
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