'Why aren't changes to Rails files being reflected inside Docker container?

I'm new to Rails and running a Rails app via Docker (on Windows/WSL2) and it seems any changes I make in controllers (and possibly elsewhere) are not reflected until I restart my container.

For example, if I delete the entire contents of a controller file, then refresh, there's no change. If I restart my container and then refresh, I get nice big red Rails errors, which is what I would expect.

What I've tried/checked:

  1. That the right environment is being loaded - calling Rails.env on the Rails CLI (inside the container) yields "development"
  2. That the cache_classes config option is set to false inside the development.rb environment file. I've also confirmed this via the Rails CLI via Rails.application.config.cache_classes - yields "false".

Here's my compose file (truncated):

  web:
    container_name: web
    env_file: .env
    build:
        context: .
        dockerfile: Dockerfile
    command: /bin/sh -c "rm -f /app/tmp/pids/server.pid && gem install bundler -v 2.2.21 && bundle install && rails db:migrate && rails server --port 3000 --binding 0.0.0.0"
    ports:
      - 3000:3000
      - 5432:5432
      - 2222:2222
    volumes:
      - ../:/app
      - bundle:/usr/local/bundle
      - rails_cache:/app/tmp/cache
      - node_modules:/app/node_modules
    profiles:
      - app
      - appnm

Anyone see what's up?

ruby-on-railsrubydockerreactjstypescriptreact-nativereact-devtools


Solution 1:[1]

Turns out I needed to change the following in config/environments/development.rb:

config.file_watcher = ActiveSupport::EventedFileUpdateChecker

to

config.file_watcher = ActiveSupport::FileUpdateChecker

Why this isn't in the development env file by default, I've no idea. Surely the whole point of a development environment is to allow high-frequency file edits be reflected in the app as they happen!

Source.

Solution 2:[2]

Fixed this by launching devtools like this: npx react-devtools

(The problem occurs when I launch devtools like this: react-devtools)

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 user9540234
Solution 2 David

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