The trouble with this approach is that your message handler is called many times to notify you of events that are not relevant for your plug-in.

这种方法的弊端是，消息处理程序将被多次调用来向您通知事件，而这些事件可能与您的插件无关。

youdao

Note: If you're having trouble with this task, there is a sample plug-in download that has all the models already made for you.

注意：如果您在执行此任务时遇到问题，您可以下载一个样例插件，此插件为您准备好了所有模型。

youdao

If that seems like too much trouble to do manually, the rails_iui plug-in contains a set of Rake tasks that will download and install iui, including changing the URLs in the CSS file.

如果觉得手工完成这些步骤比较复杂，可以使用rails_iui插件所包含的一组Rake任务，它可以下载并安装iui，包括在CSS文件中更改url。

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