Comme j'ai souvent utilisé jquery dans le développement d'applications, j'ai résumé la méthode d'introduction. ** La version Rails est 6.0.0. ** **
yarn add jquery
config/webpack/environment.js
const { environment } = require('@rails/webpacker')
#Postscript
const webpack = require('webpack')
environment.plugins.prepend('Provide',
    new webpack.ProvidePlugin({
        $: 'jquery/src/jquery',
        jQuery: 'jquery/src/jquery'
    })
)
#Jusque là
module.exports = environment
app/javascript/packs/application.js
require('jquery')  #Postscript
require("@rails/ujs").start()
require("turbolinks").start()
require("@rails/activestorage").start()
require("channels")
require("../category")
require("../category_post")
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