Rails app in 1 file, running with Seeing Is Believing

rails_sib.rb

gem 'rails', '4.2.1' # prob works on others, too, but this is the one I figured it out on
require "rails"
require 'active_record'
require 'action_controller/railtie'
require 'action_view/railtie'

# =====  Configuration  =====
Rails.logger = ActiveRecord::Base.logger = Logger.new $stdout
ActiveSupport::LogSubscriber.colorize_logging = false

class MahApp < Rails::Application
  config.cache_classes               = true
  config.eager_load                  = false
  config.consider_all_requests_local = true
  config.serve_static_files          = false
  config.assets.debug                = true
  config.session_store :cookie_store, key: '_mah_app_session'
  secrets.secret_key_base = "ffaaf61864e14edf3496df94a3ec3a24050495a0dcc8727dba1ebc7cf6594616479c741329a066ce5387fdf9d0205bfebb8a9549cc4d314c6738e62ad3fda676"
  initialize!  
end


# =====  Schema  =====
ActiveRecord::Base.establish_connection adapter: 'sqlite3', database: ':memory:'

ActiveRecord::Schema.define do
  self.verbose = true
  
  create_table :users do |t|
    t.string :name
  end
end


# =====  Models  =====
class User < ActiveRecord::Base
  validates_presence_of :name
end


# =====  Routes  =====
Rails.application.routes.draw do
  resources :users
  root 'site#index'
end

ActionDispatch::Routing::RoutesInspector.new(Rails.application.routes.routes).format(ActionDispatch::Routing::ConsoleFormatter.new).lines.map(&:chomp)
# => ["   Prefix Verb   URI Pattern               Controller#Action",
#     "    users GET    /users(.:format)          users#index",
#     "          POST   /users(.:format)          users#create",
#     " new_user GET    /users/new(.:format)      users#new",
#     "edit_user GET    /users/:id/edit(.:format) users#edit",
#     "     user GET    /users/:id(.:format)      users#show",
#     "          PATCH  /users/:id(.:format)      users#update",
#     "          PUT    /users/:id(.:format)      users#update",
#     "          DELETE /users/:id(.:format)      users#destroy",
#     "     root GET    /                         site#index"]


# =====  Hook Into Views At End Of File  =====
class EndOfFileTemplates
  TEMPLATES = DATA.slice_before { |line| line.start_with? '@@' }
                  .each_with_object({}) { |(declaration, *rest), templates|
                    declaration =~ /^@@\s*(.*?)\.html\.(.*?)\s*$/
                    [$1, $2]
                    # => ["layouts/application", "erb"]
                    #    ,["users/_form", "erb"]
                    #    ,["users/show", "erb"]
                    #    ,["users/index", "erb"]
                    #    ,["users/new", "erb"]
                    #    ,["users/show", "erb"]
                    handler       = ActionView::Template.handler_for_extension $2
                    templates[$1] = ActionView::Template.new(rest.join, declaration.strip, handler, {})
                  }

  def find_all(name, prefixes, partial, *)
    name = "_#{name}" if partial
    [prefixes, name]  # => [["users", "application"], "index"], [["layouts"], "users"], [["layouts"], "application"], [["users", "application"], "new"], [["layouts"], "users"], [["layouts"], "application"], [["users", "application"], "_form"], [["users", "application"], "show"], [["layouts"], "users"], [["layouts"], "application"]
    prefixes.map { |prefix| TEMPLATES[File.join(prefix, name)] }.compact
  end

  def find(*args)
    find_all(*args).first || raise(MissingTemplate.new(self, *args))
  end

  def exists?(path, prefixes, *args)
    find_all(path, prefixes, *args).any?
  end  
end

class ActionView::LookupContext
  def view_paths=(paths)
    @view_paths = EndOfFileTemplates.new
  end
end


# =====  Controllers  =====
class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception
end

class SiteController < ApplicationController
  def index
    redirect_to users_path
  end
end

class UsersController < ApplicationController
  def index
    @users = User.all
  end

  def show
    @user = User.find params[:id]
  end

  def new
    @user = User.new
  end

  def edit
    @user = User.find params[:id]
  end

  def create
    params
    # => {"utf8"=>"✓",
    #     "authenticity_token"=>
    #      "AvnCiAoKpyMwlujn99Q1XvJIGcBnEao9zxsisl6pyhV7xkhYDvlNFZmgk2s4oj/sEnmtGbPBm8opsDthBV2tmA==",
    #     "user"=>{"name"=>"Lilith"},
    #     "commit"=>"Create User",
    #     "controller"=>"users",
    #     "action"=>"create"}
    user_params # => {"name"=>"Lilith"}
    @user = User.new user_params
    if @user.save
      redirect_to @user, notice: 'User was successfully created.'
    else
      render :new
    end
  end

  def update
    @user = User.find params[:id]
    if @user.update user_params
      redirect_to @user, notice: 'User was successfully updated.'
    else
      render :edit
    end
  end

  def destroy
    @user = User.find params[:id]
    @user.destroy
    redirect_to users_url, notice: 'User was successfully destroyed.'
  end

  private

  def user_params
    params.require(:user).permit(:name)
  end
end


# =====  Seed Data  =====
User.create! name: 'Kirsty'
User.create! name: 'Savannah'


# =====  Use The App  =====
require 'capybara'
Capybara.app = Rails.application
session = Capybara.current_session

# visit root, follow redirect to users path
session.visit('/')
session.current_url # => "http://www.example.com/users"
session.status_code # => 200

# click link to get new user form
session.click_on 'New User'
session.current_url # => "http://www.example.com/users/new"

# create the new user
session.fill_in 'Name', with: 'Lilith'
User.pluck :name  # => ["Kirsty", "Savannah"]
session.click_on 'Create User'
User.pluck :name  # => ["Kirsty", "Savannah", "Lilith"]

# follow redirect to the show
session.current_url # => "http://www.example.com/users/3"

# >> -- create_table(:users)
# >> D, [2015-04-26T06:19:56.079868 #74266] DEBUG -- :    (0.3ms)  CREATE TABLE "users" ("id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, "name" varchar) 
# >>    -> 0.0024s
# >> D, [2015-04-26T06:19:56.349568 #74266] DEBUG -- :    (0.0ms)  begin transaction
# >> D, [2015-04-26T06:19:56.352867 #74266] DEBUG -- :   SQL (0.1ms)  INSERT INTO "users" ("name") VALUES (?)  [["name", "Kirsty"]]
# >> D, [2015-04-26T06:19:56.353145 #74266] DEBUG -- :    (0.0ms)  commit transaction
# >> D, [2015-04-26T06:19:56.353350 #74266] DEBUG -- :    (0.0ms)  begin transaction
# >> D, [2015-04-26T06:19:56.353705 #74266] DEBUG -- :   SQL (0.0ms)  INSERT INTO "users" ("name") VALUES (?)  [["name", "Savannah"]]
# >> D, [2015-04-26T06:19:56.353898 #74266] DEBUG -- :    (0.0ms)  commit transaction
# >> D, [2015-04-26T06:19:56.648619 #74266] DEBUG -- : 
# >> D, [2015-04-26T06:19:56.648747 #74266] DEBUG -- : 
# >> I, [2015-04-26T06:19:56.649303 #74266]  INFO -- : Started GET "/" for 127.0.0.1 at 2015-04-26 06:19:56 -0600
# >> I, [2015-04-26T06:19:56.654987 #74266]  INFO -- : Processing by SiteController#index as HTML
# >> I, [2015-04-26T06:19:56.655784 #74266]  INFO -- : Redirected to http://www.example.com/users
# >> I, [2015-04-26T06:19:56.655898 #74266]  INFO -- : Completed 302 Found in 1ms
# >> D, [2015-04-26T06:19:56.657069 #74266] DEBUG -- : 
# >> D, [2015-04-26T06:19:56.657122 #74266] DEBUG -- : 
# >> I, [2015-04-26T06:19:56.657196 #74266]  INFO -- : Started GET "/users" for 127.0.0.1 at 2015-04-26 06:19:56 -0600
# >> I, [2015-04-26T06:19:56.659345 #74266]  INFO -- : Processing by UsersController#index as HTML
# >> D, [2015-04-26T06:19:56.684346 #74266] DEBUG -- :   User Load (0.2ms)  SELECT "users".* FROM "users"
# >> I, [2015-04-26T06:19:56.688422 #74266]  INFO -- :   Rendered @@ users/index.html.erb (22.1ms)
# >> I, [2015-04-26T06:19:56.689851 #74266]  INFO -- : Completed 200 OK in 30ms (Views: 29.7ms)
# >> D, [2015-04-26T06:19:56.694186 #74266] DEBUG -- : 
# >> D, [2015-04-26T06:19:56.694244 #74266] DEBUG -- : 
# >> I, [2015-04-26T06:19:56.694322 #74266]  INFO -- : Started GET "/users/new" for 127.0.0.1 at 2015-04-26 06:19:56 -0600
# >> I, [2015-04-26T06:19:56.695209 #74266]  INFO -- : Processing by UsersController#new as HTML
# >> I, [2015-04-26T06:19:56.712803 #74266]  INFO -- :   Rendered @@ users/_form.html.erb (13.5ms)
# >> I, [2015-04-26T06:19:56.712984 #74266]  INFO -- :   Rendered @@ users/new.html.erb (17.2ms)
# >> I, [2015-04-26T06:19:56.713353 #74266]  INFO -- : Completed 200 OK in 18ms (Views: 17.8ms)
# >> D, [2015-04-26T06:19:56.715458 #74266] DEBUG -- :    (0.1ms)  SELECT "users"."name" FROM "users"
# >> D, [2015-04-26T06:19:56.719941 #74266] DEBUG -- : 
# >> D, [2015-04-26T06:19:56.719987 #74266] DEBUG -- : 
# >> I, [2015-04-26T06:19:56.720098 #74266]  INFO -- : Started POST "/users" for 127.0.0.1 at 2015-04-26 06:19:56 -0600
# >> I, [2015-04-26T06:19:56.720767 #74266]  INFO -- : Processing by UsersController#create as HTML
# >> I, [2015-04-26T06:19:56.720833 #74266]  INFO -- :   Parameters: {"utf8"=>"✓", "authenticity_token"=>"AvnCiAoKpyMwlujn99Q1XvJIGcBnEao9zxsisl6pyhV7xkhYDvlNFZmgk2s4oj/sEnmtGbPBm8opsDthBV2tmA==", "user"=>{"name"=>"Lilith"}, "commit"=>"Create User"}
# >> D, [2015-04-26T06:19:56.722157 #74266] DEBUG -- :    (0.1ms)  begin transaction
# >> D, [2015-04-26T06:19:56.722826 #74266] DEBUG -- :   SQL (0.1ms)  INSERT INTO "users" ("name") VALUES (?)  [["name", "Lilith"]]
# >> D, [2015-04-26T06:19:56.723103 #74266] DEBUG -- :    (0.0ms)  commit transaction
# >> I, [2015-04-26T06:19:56.723725 #74266]  INFO -- : Redirected to http://www.example.com/users/3
# >> I, [2015-04-26T06:19:56.723826 #74266]  INFO -- : Completed 302 Found in 3ms
# >> D, [2015-04-26T06:19:56.725100 #74266] DEBUG -- : 
# >> D, [2015-04-26T06:19:56.725161 #74266] DEBUG -- : 
# >> I, [2015-04-26T06:19:56.725276 #74266]  INFO -- : Started GET "/users/3" for 127.0.0.1 at 2015-04-26 06:19:56 -0600
# >> I, [2015-04-26T06:19:56.726342 #74266]  INFO -- : Processing by UsersController#show as HTML
# >> I, [2015-04-26T06:19:56.726395 #74266]  INFO -- :   Parameters: {"id"=>"3"}
# >> D, [2015-04-26T06:19:56.744432 #74266] DEBUG -- :   User Load (0.2ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 3]]
# >> I, [2015-04-26T06:19:56.746130 #74266]  INFO -- :   Rendered @@ users/show.html.erb (1.1ms)
# >> I, [2015-04-26T06:19:56.747018 #74266]  INFO -- : Completed 200 OK in 21ms (Views: 2.3ms)
# >> D, [2015-04-26T06:19:56.748011 #74266] DEBUG -- :    (0.1ms)  SELECT "users"."name" FROM "users"


__END__
@@ layouts/application.html.erb
  <!DOCTYPE html>
  <html>
  <head>
    <title>MahApp</title>
    <%= stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track' => true %>
    <%= javascript_include_tag 'application', 'data-turbolinks-track' => true %>
    <%= csrf_meta_tags %>
  </head>
  <body>

  <%= yield %>

  </body>
  </html>

@@ users/_form.html.erb
  <%= form_for(@user) do |f| %>
    <% if @user.errors.any? %>
      <div id="error_explanation">
        <h2><%= pluralize(@user.errors.count, "error") %> prohibited this user from being saved:</h2>

        <ul>
        <% @user.errors.full_messages.each do |message| %>
          <li><%= message %></li>
        <% end %>
        </ul>
      </div>
    <% end %>

    <div class="field">
      <%= f.label :name %><br>
      <%= f.text_field :name %>
    </div>
    <div class="actions">
      <%= f.submit %>
    </div>
  <% end %>


@@ users/show.html.erb
  <h1>Editing User</h1>

  <%= render 'form' %>

  <%= link_to 'Show', @user %> |
  <%= link_to 'Back', users_path %>


@@ users/index.html.erb
  <p id="notice"><%= notice %></p>

  <h1>Listing Users</h1>

  <table>
    <thead>
      <tr>
        <th>Name</th>
        <th colspan="3"></th>
      </tr>
    </thead>

    <tbody>
      <% @users.each do |user| %>
        <tr>
          <td><%= user.name %></td>
          <td><%= link_to 'Show', user %></td>
          <td><%= link_to 'Edit', edit_user_path(user) %></td>
          <td><%= link_to 'Destroy', user, method: :delete, data: { confirm: 'Are you sure?' } %></td>
        </tr>
      <% end %>
    </tbody>
  </table>

  <br>

  <%= link_to 'New User', new_user_path %>


@@ users/new.html.erb
  <h1>New User</h1>

  <%= render 'form' %>

  <%= link_to 'Back', users_path %>


@@ users/show.html.erb
  <p id="notice"><%= notice %></p>

  <p>
    <strong>Name:</strong>
    <%= @user.name %>
  </p>

  <%= link_to 'Edit', edit_user_path(@user) %> |
  <%= link_to 'Back', users_path %>