Single Page Rails App example / template

single_page_rails_app.ru

# filename: single_page_rails_app.ru
# RUN via: `rackup single_page_rails_app.ru`

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

  gem "rack", "2.2.9"
  gem "rails", "~> 7.1"
  gem "sqlite3"
end

require "rails/all"
database = "development.sqlite3"

ENV["DATABASE_URL"] = "sqlite3:#{database}"
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: database)
ActiveRecord::Base.logger = Logger.new(STDOUT)
ActiveRecord::Schema.define do
  create_table :posts, force: true do |t|
    t.text :content
  end

  create_table :comments, force: true do |t|
    t.integer :post_id
    t.text :content
  end
end

class App < Rails::Application
  config.root = __dir__
  config.consider_all_requests_local = true
  config.secret_key_base = "i_am_a_secret"
  config.active_storage.service_configurations = { "local" => { "service" => "Disk", "root" => "./storage" } }
  config.log_level = :debug
  config.logger = Logger.new($stdout)

  routes.append do
    root to: "welcome#index"
  end
end

class Post < ActiveRecord::Base
  has_many :comments
end

class Comment < ActiveRecord::Base
  belongs_to :post
end

class WelcomeController < ActionController::Base
  def index
    render inline: 'Hi!'
  end
end

App.initialize!

run App