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Created June 24, 2014 15:47
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Simple rails example of form interacting with non-activerecord backend code
# config/application.rb
require File.expand_path('../boot', __FILE__)
# Pick the frameworks you want:
require "active_model/railtie"
# require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "action_view/railtie"
# require "sprockets/railtie"
# require "rails/test_unit/railtie"
# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
module Foo
class Application < Rails::Application
# Settings in config/environments/* take precedence over those specified here.
# Application configuration should go into files in config/initializers
# -- all .rb files in that directory are automatically loaded.
# Set default to the specified zone and make Active Record auto-convert to this zone.
# Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
# config.time_zone = 'Central Time (US & Canada)'
# The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
# config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
# config.i18n.default_locale = :de
# Let Rails autoload from lib directory
config.autoload_paths << Rails.root.join('lib') # <------- ADDED THIS LINE
# controllers/foo_controller.rb
class FooController < ApplicationController
def index
@something = Widget.something
def bar
answer = params[:foo][:something].to_i
flash[:info] = "Your answer (#{answer}) was #{Widget.check answer}!"
redirect_to action: :index
<!-- app/views/foo/index.html.erb -->
<% if flash[:info] %>
<span class="flash success"><%= flash[:info] %></span>
<% end %>
<%= form_for :foo, url: foo_bar_url do |f| %>
<p>Here's a value from the widget:</p>
<%= f.text_field :something, value: @something %></p>
<%= f.submit "Bar!" %>
<% end %>
# config/routes.rb
Rails.application.routes.draw do
get "foo" => "foo#index"
post "foo/bar" => "foo#bar"
# lib/widget.rb
class Widget
def self.something
Random.rand 100
def self.check number
number == 42 ? "correct" : "wrong"
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