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    Ongoing observations by End Point Dev people

    Migrating Rails 6 React to Rails 7 React

    Indra Pranesh Palanisamy

    By Indra Pranesh Palanisamy
    June 26, 2023

    A coconut tree stands in the corner of a serene blue sky

    CasePointer’s disease reporting portal is built on React and Rails 6, and it’s time for an upgrade to Rails 7. This blog post will cover the steps, benefits, and challenges of migrating from Rails 6 to Rails 7, and offer valuable insights into the world of Ruby on Rails.

    With the recent release of Rails 7, there are many new features and improvements to explore. One of the biggest changes in Rails 7 is the retirement of Webpacker in favor of using the native webpack for bundling JavaScript.

    For those who are not familiar, Webpacker is a Rails gem which is a wrapper around the webpack build system that provides a standard webpack configuration and reasonable defaults.

    Steps for migrating Rails 6 React to Rails 7 React

    To migrate a Rails 6 React application to Rails 7 React, follow these steps:

    1. Update the Rails Gem in the Gemfile

    In your application’s Gemfile, update the Rails gem version to Rails 7:

    -gem "rails", "~> 6.1.4"
    +gem "rails", "~> 7.0.0"

    2. Upgrade Rails packages

    Upgrade the Rails packages using Yarn:

    yarn upgrade @rails/actioncable --latest
    yarn upgrade @rails/activestorage --latest

    3. Run the Rails update task

    Run the following command to initiate the Rails update task:

    bin/rails app:update

    This task guides you file by file to integrate the new Rails 7 defaults. Refer to the Rails documentation for detailed information on this update task.

    4. Remove Webpacker

    Since Webpacker is no longer the default in Rails 7, follow these steps to remove it:

    Remove the webpacker gem from your Gemfile:

    -gem 'webpacker', '~> 4.0'

    Remove the webpacker.yml file and any other files associated with webpacker.

    Run bundle install to update the Gemfile.lock:

    bundle install

    5. Setting up Webpack

    To set up Webpack for your Rails 7 React application, follow these steps:

    Install webpack and other necessary libraries:

    yarn install webpack webpack-cli @babel/core

    Create a webpack.config.js file at the root of your application:

    // webpack.config.js
    const path = require("path");
    const webpack = require("webpack");
    // Add other necessary plugins and configurations
    module.exports = {
      // Webpack configuration options
      output: {
        // Make sure to use the path of the rails asset pipeline
        path: path.join(__dirname, '/app/assets/builds'),
        // ...
      module: {
        rules: [
          // Add CSS/SASS/SCSS rule with loaders
            test: /\.(?:sa|sc|c)ss$/i,
            use: [MiniCssExtractPlugin.loader, 'css-loader', 'sass-loader'],
            test: /\.(png|jpe?g|gif|eot|woff2|woff|ttf|svg)$/i,
            use: 'file-loader',
            test: /\.(js|jsx)$/,
            exclude: /node_modules/,
            use: {
              loader: "babel-loader"
      // ...

    Add a .babelrc file for Babel configuration:

      "presets": ["@babel/preset-env", "@babel/preset-react"]

    Update the scripts section in your package.json:

      "scripts": {
        "build": "webpack",
        "dev": "webpack --watch"

    6. Update Rails asset tags

    In your application views, update the asset tags from stylesheet_pack_tag and javascript_pack_tag to stylesheet_link_tag and javascript_include_tag, respectively:

    <%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
    <%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>

    7. Start the dev server

    Start the Rails development server with:

    rails server

    Then start the React development server with:

    yarn run dev

    By following these steps, we can take advantage of the new features and improvements in Rails 7 while continuing to leverage the power of React.

    rails react migration