Ruby on Rails - The Single Engineer Framework

Slides for seminar at Software University about Ruby on Rails:
https://softuni.bg/trainings/4732/ruby-on-rails-the-single-engineer-framework-seminar

Links from the talk:

https://tips.rstankov.com
https://angrybuilding.com
https://www.ruby-lang.org/en/
https://guides.rubyonrails.org/getting_started.html
https://newsletter.pragmaticengineer.com/p/what-is-old-is-new-again
https://github.com/maybe-finance/maybe
https://github.com/discourse/discourse
https://github.com/forem/forem
https://github.com/mastodon/mastodon
https://github.com/thoughtbot/upcase
https://github.com/feedbin/feedbin
https://gitlab.com/gitlab-org/gitlab
https://blog.rstankov.com/top-8-ruby-on-rails-engines/
https://www.youtube.com/watch?v=X2sgQ38UDVY
https://bit.ly/4cznIfA
https://rubybanitsa.com/
https://balkanruby.com/

Transcript

1. Ruby on Rails The Single Engineer Framework Radoslav Stankov
2. !
3. Radoslav Stankov @rstankov rstankov.com
4. https://tips.rstankov.com
6. I began my web development career using Flash, PHP, and JavaScript at an agency in Dobrich in 2002.
7. I was 15 "
8. ... after 22 years #
9. here some of the technologies, I have worked with...
11. Careers in tech are long, and technology trends come and go. You won't be able to have a meaningful career working with a single technology your whole career.
13. - one developer (me) $ - management portal % - implement a mobile app & - for iOS ' / Android (
14. Building mapping ) Mobile app & Issue tracker * Employees + Bulletin board , Notifications - Taxation . Contacts / Omni search 0 Reporting 1 Printing 2 Bookkeeping 3 Voting 4 Financials 5 Homebook 6 Debtors 7 Bulk operations ⚙ Messaging 9 Calendar : Funds ; ePay / EasyPay < Bank imports = Invoicing > Warranty Issues ?
 Technicians @
 Individual accounts A Business accounts ) Audit logs B
 Archiving C Trials D Demo E
 I18n F G H
 Marketing site I
15. & Mobile stack J
16. % Web stack J
17. Ruby on Rails and its ecosystem enabled me to develop Angry Building single-handedly. It felt like having a cheat code.
19. Ruby on Rails
20. Ruby on Rails
21. Ruby on Rails
22. Ruby on Rails
23. Ruby Ruby is an interactive, object- oriented programming language. Its motto is: "Optimized for programmer happiness"
24. https://rubygems.org/
25. Ruby on Rails Ruby on Rails is a web application framework.
27. Who uses Ruby? K
30. ... Ruby on Rails old and boring, designed for monoliths L
31. https://newsletter.pragmaticengineer.com/p/what-is-old-is-new-again
32. https://newsletter.pragmaticengineer.com/p/what-is-old-is-new-again
34. ... one interesting story
35. ... one interesting story ... maybe $
38. https://github.com/maybe-finance/maybe
39. Ruby
40. M Syntax N Symbols N Blocks O Expressions P Everything is object Q Open classes
41. Variables a = 1 # Number b = "string" # String c = [1, 2, 3, 4] # Array d = { key: 'value' } # Hash
42. Symbols a = :key hash[:key]
43. Everything is an object person.name "string".size array.empty? array[0] == array.first array[1] == array.second array[array.size - 1] == array.last 1.day.ago 1.day.ago - 2.hours
44. puts("string") puts "string" Method calling
45. Blocks 5.times { puts "Ruby is cool!" } 5.times do puts "Ruby is cool!" end
46. Blocks [1,2,3,4].each { |value| puts value } # => [1, 2, 3, 4] [1,2,3,4].map { |value| value * value } # => [1, 4, 9, 16] [1,2,3,4].reduce { |a, b| a + b } # => 10
47. Blocks [1,2,3,4].each { puts _1 } # => [1, 2, 3, 4] [1,2,3,4].map { _1 * _1 } # => [1, 4, 9, 16] [1,2,3,4].reduce { _1 + _1 } # => 10
48. Blocks File.open('file.txt') do |file| file.write 'content' end
49. Blocks File.open('file.txt') do |file| file << 'content' end
50. Blocks File.open('file.txt') do _1 << 'content' end
51. Blocks File.open('file.txt') { _1 << 'content' }
52. Blocks def method_with_block(value) yield value end value = method_with_block(5) { |v| v + 4 } puts value # 9
53. Blocks def method_with_block(value, &block) block.call(value) end value = method_with_block(5) { |v| v + 4 } puts value # 9
54. Expressions def explain_number(value) if value % 2 result = 'even' else result = 'odd' end return result end
55. Expressions def explain_number(value) if value % 2 result = 'even' else result = 'odd' end result end
56. Expressions def explain_number(value) if value.even? result = 'even' else result = 'odd' end result end
57. Expressions def explain_number(value) result = if value.even? 'even' else 'odd' end result end
58. Expressions def explain_number(value) if value.even? 'even' else 'odd' end end
59. Expressions def error_message(value) if !value.present? return nil end return 'value is empty' end
60. Expressions def error_message(value) if !value.present? return nil end 'value is empty' end
61. Expressions def error_message(value) unless value.present? return nil end 'value is empty' end
62. Expressions def error_message(value) return nil unless value.present? 'value is empty' end
63. Expressions def error_message(value) return unless value.present? 'value is empty' end
64. Expressions def error_message(value) 'value is empty' if value.blank? end
65. Expressions def error_message(value) return 'value is empty' if value.blank? return "value #{value} is to long" if value.size > 100 end
66. Expressions def error_message(value) if value.blank? 'value is empty' elsif value.size > 100 "value #{value} is to long" end end
67. Classes me = Person.new("Radoslav", "Stankov")
 me.first_name # Radoslav me.last_name # Stankov me.full_name # Radoslav Stankov
68. class Person def initialize(first_name, last_name) @first_name = first_name @last_name = last_name end def first_name @first_name end def first_name=(value) @first_name = value end Classes
69. end def first_name=(value) @first_name = value end def last_name @last_name end def last_name=(value) @last_name = value end def full_name "#{first_name} + #{last_name}" end end Classes
70. Classes class Person attr_reader :first_name, :last_name attr_writer :first_name, :last_name def initialize(first_name, last_name) @first_name = first_name @last_name = last_name end def full_name "#{first_name} + #{last_name}" end end
71. Classes class Person attr_accessor :first_name, :last_name def initialize(first_name, last_name) @first_name = first_name @last_name = last_name end def full_name "#{first_name} + #{last_name}" end end
72. Meta programming class Person attr_accessor :first_name, :last_name end
74. Meta Programming
75. R Nothing is special S Everything is an object T No definitions, just executions U Cool syntax V Meta programming
76. Open classes class Array def first self[0] end def second self[1] end end array = [1, 2, 3, 4] array.first # 1 array.second # 2
77. class MyClass puts "I'll be executed" unless RUBY_VERSION >= "3.3.3"
 puts "I'll be executed after ruby 3.3.3" def some_method # ... code end end end No definitions, just executions
78. Meta programming class Person attr_accessor :first_name, :last_name end
79. Meta programming class Person def first_name @first_name end def first_name=(value) @first_name = value end end
80. Meta programming class Person define_method(:first_name) do @first_name end define_method(:first_name=) do |value| @first_name = value end end
81. Meta programming class Person define_method(:first_name) do instance_variable_get(:@first_name) end define_method(:first_name=) do |value| instance_variable_set(:@first_name, value) end end
82. Meta programming class Person define_method(:first_name) do instance_variable_get :@first_name end define_method(:first_name=) do |value| instance_variable_set :@first_name, value end end
83. Meta programming class Person attr_accessor :first_name, :last_name end
84. Meta programming class Person def self.attr_accessor(attribute) define_method(attribute) do instance_variable_get :"@#{attribute}" end define_method(:"#{attribute}=") do |value| instance_variable_set :"@#{attribute}", value end end end
85. Meta programming class Person def self.attr_accessor(*attributes) attributes.each do |attribute| define_method(attribute) do instance_variable_get :"@#{attribute}" end define_method(:"#{attribute}=") do |value| instance_variable_set :"@#{attribute}", value end end end end
86. Meta programming class Person attr_accessor :first_name, :last_name end
92. W Model View Controller (MVC) X Batteries included Y Convention over configuration Z Extendible platform
93. W Model View Controller (MVC)
94. W Model View Controller (MVC)
95. W Model View Controller (MVC)
96. W Model View Controller (MVC)
97. W Model View Controller (MVC)
98. W Model View Controller (MVC)
99. W Model View Controller (MVC)
100. W Model View Controller (MVC)
101. W Model View Controller (MVC)
102. W Model View Controller (MVC)
104. ActiveSupport - utilities ActiveModel - base model & validations ActiveRecord - object relation mapper (ORM) ActiveJob - background job processing ActiveStorage - file uploads ActionController - Controller from MVC ActionView - View from MVC ActionMailer - Sending emails ActionMailbox - Receiving & processing emails ActionCable - Web Socket & real time ActionText - Rich text editing Propshaft - assets delivery I18n - internalization X Batteries included
105. Y Convention over configuration
106. https://github.com/maybe-finance/maybe https://github.com/discourse/discourse https://github.com/forem/forem https://github.com/mastodon/mastodon https://github.com/thoughtbot/upcase https://github.com/feedbin/feedbin https://gitlab.com/gitlab-org/gitlab Open Source Apps
107. https://blog.rstankov.com/top-8-ruby-on-rails-engines/ Z Extendible platform
108. Sidekiq
109. Blazer
110. Lookbook
111. Flipper
112. GraphiQL
113. ... and a lot more ✨
114. https://rubygems.org/
116. rails new blog rails generate scaffold post title:string content:text
118. db/migrate/[...]_create_posts.rb class CreatePosts < ActiveRecord::Migration[7.1] def change create_table :posts do |t| t.string :title, null: false t.text :content, null: false t.timestamps end end end
119. rails db:migrate
121. class Post < ApplicationRecord validates :title, presence: true validates :content, presence: true end app/models/post.rb
122. Rails.application.routes.draw do resources :posts # Define your application routes per the DSL in # https://guides.rubyonrails.org/routing.html # Reveal health status on /up that returns 200 # if the app boots with no exceptions, otherwise 500. # Can be used by load balancers and uptime monitors to # verify that the app is live. get "up" => "rails/health#show", as: :rails_health_check # Defines the root path route ("/") # root "posts#index" end config/routes.rb
123. class PostsController < ApplicationController # GET /posts def index @posts = Post.all end # GET /posts/1 def show @post = Post.find(params[:id]) end # GET /posts/new def new @post = Post.new end # GET /posts/1/edit def edit @post = Post.find(params[:id]) end # POST /posts def create app/controllers/posts_controller.rb
124. # POST /posts def create @post = Post.new(post_params) if @post.save redirect_to post_url(@post), notice: "Post was successfully cr else render :new, status: :unprocessable_entity end end # PATCH/PUT /posts/1 def update @post = Post.find(params[:id]) if @post.update(post_params) redirect_to post_url(@post), notice: "Post was successfully up else render :edit, status: :unprocessable_entity end end # DELETE /posts/1 app/controllers/posts_controller.rb
125. if @post.update(post_params) redirect_to post_url(@post), notice: "Post was successfully up else render :edit, status: :unprocessable_entity end end # DELETE /posts/1 def destroy @post = Post.find(params[:id]) @post.destroy! redirect_to posts_url, notice: "Post was successfully destroyed. end private def post_params params.require(:post).permit(:title, :content) end end app/controllers/posts_controller.rb
126. <p style="color: green"><%= notice %></p> <h1>Posts</h1> <div id="posts"> <% @posts.each do |post| %> <%= render post %> <p> <%= link_to "Show this post", post %> </p> <% end %> </div> <%= link_to "New post", new_post_path %> app/views/posts/index.html.erb
127. <%= form_with(model: post) do |form| %> <% if post.errors.any? %> <div style="color: red"> <h2><%= pluralize(post.errors.count, "error") %> prohibited this post from bei <ul> <% post.errors.each do |error| %> <li><%= error.full_message %></li> <% end %> </ul> </div> <% end %> <div> <%= form.label :title, style: "display: block" %> <%= form.text_field :title %> </div> <div> <%= form.label :content, style: "display: block" %> <%= form.text_area :content %> </div> <div> <%= form.submit %> </div> <% end %> app/views/posts/_form.html.erb
128. rails server
138. rails action_text:install
140. bundle
142. rails server
144. class Post < ApplicationRecord validates :title, presence: true validates :content, presence: true has_rich_text :content end app/models/post.rb
145. <%= form_with(model: post) do |form| %> <% if post.errors.any? %> <div style="color: red"> <h2><%= pluralize(post.errors.count, "error") %> prohibited this post from bei <ul> <% post.errors.each do |error| %> <li><%= error.full_message %></li> <% end %> </ul> </div> <% end %> <div> <%= form.label :title, style: "display: block" %> <%= form.text_field :title %> </div> <div> <%= form.label :content, style: "display: block" %> <%= form.rich_text_area :content %> </div> <div> <%= form.submit %> </div> <% end %> app/views/posts/_form.html.erb
148. https://rubyonrails.org/
149. Learning resources
150. https://tips.rstankov.com
151. https://www.youtube.com/watch?v=X2sgQ38UDVY
152. https://bit.ly/4cznIfA
154. https://rubybanitsa.com/
156. https://balkanruby.com/
157. https://rstankov.com/appearances