Rubyonrails 在 JS 模块中使用 RailsUJS(带有 webpacker 的 Rails 6)

我刚刚切换到Rails 6(6.0.0.rc1)，默认情况下，它将Webpacker gem与Rails UJS一起用于Javascriptassets资源 .我想在我的一些模块中使用Rails UJS，以便从具有以下功能的函数提交表单:

const form = document.querySelector("form")
Rails.fire(form, "submit")

在以前安装了Webpacker的Rails版本中，Rails参考在我的模块中似乎是"全球"可用的，但现在我在调用Rails.fire时得到了这个…

ReferenceError: Rails is not defined

How can i make 100 from 101 available to a specific or to all of my modules?

在我的设置下面…

app/javascript/controllers/form_controller.js

import { Controller } from "stimulus"

export default class extends Controller {
  // ...
  submit() {
    const form = this.element
    Rails.fire(form, "submit")
  }
  // ...
}

app/javascript/controllers.js

// Load all the controllers within this directory and all subdirectories. 
// Controller files must be named *_controller.js.

import { Application } from "stimulus"
import { definitionsFromContext } from "stimulus/webpack-helpers"

const application = Application.start()
const context = require.context("controllers", true, /_controller\.js$/)
application.load(definitionsFromContext(context))

app/javascript/packs/application.js

require("@rails/ujs").start()
import "controllers"

谢谢