New Project

Important: These docs are for the outdated Jets 5 versions and below. For the latest Jets docs: docs.rubyonjets.com

We’ll use jets new to generate a new Jets project.

jets new demo --mode html

We’re using the --mode html option to generate a Jets project designed for HTML apps. Note that the default mode is HTML, so it’s optional in this case.

❯ jets new demo
      create  .env
      create  .gitignore
      create  .rspec
      create  Gemfile
      create  README.md
      create  Rakefile
      create  app/assets/config/manifest.js
      create  app/assets/images/.keep
      create  app/assets/javascripts/.keep
      create  app/assets/stylesheets/application.css
      create  app/controllers/application_controller.rb
      create  app/helpers/application_helper.rb
      create  app/jobs/application_job.rb
      create  app/models/application_record.rb
      create  app/views/layouts/application.html.erb
      create  config.ru
      create  config/application.rb
      create  config/database.yml
      create  config/environments/development.rb
      create  config/environments/production.rb
      create  config/environments/test.rb
      create  config/initializers/content_security_policy.rb
      create  config/initializers/filter_parameter_logging.rb
      create  config/initializers/permissions_policy.rb
      create  config/routes.rb
      create  db/.gitkeep
      create  public/404.html
      create  public/422.html
      create  public/500.html
      create  public/favicon.ico
      create  spec/controllers/posts_controller_spec.rb
      create  spec/fixtures/payloads/posts-index.json
      create  spec/fixtures/payloads/posts-show.json
      create  spec/spec_helper.rb

For more information about the folders and files, see Project Structure.

Application Config

Let’s take a look at the starter application config. It looks something like this:

config/application.rb

module Demo
  class Application < Jets::Application
    config.load_defaults 5.0
    config.project_name = "demo"
    config.mode = "html"
  end
end

The project_name will be used when we deploy this project. The project that is deployed will have the environment added, IE: demo-dev.

You can override settings for each environment with the files in config/environments. Example:

config/environments/development.rb

Jets.application.configure do
  config.cache_classes = false
  config.eager_load = false
  config.logging.event = true
end

For more settings see the Config Reference.

Next, we’ll review the generated project files.

In this section: