Ruby on rails Rails和引导

我正在以下Github存储库中研究源代码：

克隆并运行Rails服务器后，view source将为索引页显示以下所有行：

<link href="/assets/application.css?body=1" media="all" rel="stylesheet" />
<link href="/assets/main.css?body=1" media="all" rel="stylesheet" />
<script src="/assets/jquery.js?body=1"></script>
<script src="/assets/jquery_ujs.js?body=1"></script>
<script src="/assets/underscore.js?body=1"></script>
<script src="/assets/bootstrap-transition.js?body=1"></script>
<script src="/assets/bootstrap-affix.js?body=1"></script>
<script src="/assets/bootstrap-alert.js?body=1"></script>
<script src="/assets/bootstrap-button.js?body=1"></script>
<script src="/assets/bootstrap-carousel.js?body=1"></script>
<script src="/assets/bootstrap-collapse.js?body=1"></script>
<script src="/assets/bootstrap-dropdown.js?body=1"></script>
<script src="/assets/bootstrap-modal.js?body=1"></script>
<script src="/assets/bootstrap-scrollspy.js?body=1"></script>
<script src="/assets/bootstrap-tab.js?body=1"></script>
<script src="/assets/bootstrap-tooltip.js?body=1"></script>
<script src="/assets/bootstrap-popover.js?body=1"></script>
<script src="/assets/bootstrap-typeahead.js?body=1"></script>
<script src="/assets/bootstrap.js?body=1"></script>
<script src="/assets/angular.js?body=1"></script>
<script src="/assets/application.js?body=1"></script>
<script src="/assets/main.js?body=1"></script>
<script src="/assets/Controllers/main/mainIndexCtrl.js?body=1"></script>
<script src="/assets/Controllers/main/mainPostCtrl.js?body=1"></script>

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我只是不知道这些bootstrap-xxxxxx.js是从哪里来的。它们不存在于资产的任何子文件夹或任何其他文件夹中。Rails如何知道或者是什么告诉Rails将它们包含在生成的HTML中

就像Igor Kasyanchuk在评论中提到的，它来自您的gem中的bootstrap sass gem。

您的gem文件中有bootstrap gem吗？它来自gem。当您在application.js文件中添加require'bootstrap'时。