在子目录中找不到组件

Question

很简单，我只是将组件重新放置在子目录中：

app/assets/javascripts/components/dir/_main.js.jsx
<%= react_component 'dir/Main' %>

我收到此错误：

Uncaught ReferenceError: dir is not defined
    at eval (eval at module.exports (react_ujs.self-eb4e9994228856e343ab49d1aed6c23046bf4308ea6d46395e5c39170ab3e56f.js?body=1:95), <anonymous>:1:1)
    at Object.module.exports [as getConstructor] (react_ujs.self-eb4e9994228856e343ab49d1aed6c23046bf4308ea6d46395e5c39170ab3e56f.js?body=1:95)
    at Object.mountComponents (react_ujs.self-eb4e9994228856e343ab49d1aed6c23046bf4308ea6d46395e5c39170ab3e56f.js?body=1:303)
    at HTMLDocument.ReactRailsUJS.handleMount (react_ujs.self-eb4e9994228856e343ab49d1aed6c23046bf4308ea6d46395e5c39170ab3e56f.js?body=1:350)
    at Object.Turbolinks.dispatch (turbolinks.self-2db6ec539b9190f75e1d477b305df53d12904d5cafdd47c7ffd91ba25cbec128.js?body=1:6)
    at e.notifyApplicationAfterPageLoad (turbolinks.self-2db6ec539b9190f75e1d477b305df53d12904d5cafdd47c7ffd91ba25cbec128.js?body=1:7)
    at e.pageLoaded (turbolinks.self-2db6ec539b9190f75e1d477b305df53d12904d5cafdd47c7ffd91ba25cbec128.js?body=1:7)
    at turbolinks.self-2db6ec539b9190f75e1d477b305df53d12904d5cafdd47c7ffd91ba25cbec128.js?body=1:6

但是，如果我直接将其放入components文件夹，它会很好地工作：

app/assets/javascripts/components/_main.js.jsx
<%= react_component 'Main' %>

有什么主意吗？