МГТУ

http://e-learning.bmstu.ru/moodle/mod/forum/discuss.php?d=1121

Transcript

1. View Slide

2. Hello
   

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3. Lecture
   Coding session
   

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4. Anton Davydov
   github.com/davydovanton
   twitter.com/anton_davydov
   davydovanton.com
   

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13. Core member
    

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15. twitch.tv/davydovanton
    

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16. OpenSource evangelist
    

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17. ruby
    rom-rb
    dry-rb
    rails
    crystal
    etc
    

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18. Stickers
    

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19. • Memes
    • Coffee
    • Beer
    • Kendo
    • Psychology
    • jRPG
    • SW-2039-0208-4228 / 3DS also welcome
    • How to draw images for presentations
    

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20. Why am I here?
    

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21. Inspiration
    Web outside Ruby on Rails
    Next steps and community
    

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22. Inspiration
    Web outside Ruby on Rails
    Next steps and community
    

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23. Inspiration
    Web outside Ruby on Rails
    Next steps and community
    

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25. Luca Guidi
    github.com/jodosha
    

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26. lucaguidi.com/2014/01/01/announcing-lotus/
    

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28. General Ideas
    

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29. Secure by default
    

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30. Fast response times
    

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31. Long-term maintenance
    

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32. Modularity
    Forget about fat models
    

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34. Simplicity and Lightweight
    Framework is just a tool
    

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35. Threadsafe
    
    
    

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36. Zero Monkey-Patching
    Don’t think about framework or language
    

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37. railshurts.com/quiz
    

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38. railshurts.com/quiz
    

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39. Architecturally Sound
    Isolation everywhere
    

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40. How to made it?
    

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41. Container Architecture
    Clean Architecture
    

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42. Project
    request
    

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43. App App App
    request
    

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44. App App App
    lib
    request
    

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45. Ap Ap Ap
    lib
    Ap Ap Ap
    lib
    Ap Ap Ap
    lib
    request
    

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46. Ap Ap Ap
    lib
    Ap Ap
    lib
    Ap Ap Ap
    lib
    request
    Ap
    

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47. apps/
    ├── admin
    │ ├── application.rb
    │ ├── assets
    │ ├── config
    │ │ └── routes.rb
    │ ├── controllers
    │ │ └── ...
    │ ├── templates
    │ │ └── ...
    │ └── views
    │ └── ...
    └── web
    

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48. Business Logic
    

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49. lib/
    ├── project_name
    │ ├── interactors
    │ │ └── create_user.rb
    │ ├── entities
    │ │ └── user.rb
    │ ├── mailers
    │ │ └── templates
    │ └── repositories
    

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50. lib/
    ├── project_name
    │ ├── interactors
    │ │ └── create_user.rb
    │ ├── entities
    │ │ └── user.rb
    │ ├── mailers
    │ │ └── templates
    │ └── repositories
    

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51. lib/
    ├── project_name
    │ ├── interactors
    │ │ └── create_user.rb
    │ ├── entities
    │ │ └── user.rb
    │ ├── mailers
    │ │ └── templates
    │ └── repositories
    

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52. lib/
    ├── project_name
    │ ├── interactors
    │ │ └── create_user.rb
    │ ├── entities
    │ │ └── user.rb
    │ ├── mailers
    │ │ └── templates
    │ └── repositories
    

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53. Gems included
    

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54. hanami - Base repository, CLI
    router - Rack compatible HTTP router for Ruby
    controller - Full featured and fast actions for Rack
    utils - Ruby core extensions and class utilities
    model - Persistence with entities and repositories
    

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55. validations - Validations mixin for Ruby objects
    helpers - View helpers for Ruby applications
    view - Presentation with a separation
    assets - Assets management for Ruby
    mailer - Mail for Ruby applications
    

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56. events - PubSub framework for Ruby
    cli - CLI framework for Ruby
    webconsole - Web console for development
    ujs - Assets management for Ruby
    

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57. Differences
    

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58. # rack
    class HelloApp
    def call(env)
    [200, { **env }, ['Hello!']]
    end
    end
    

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59. # hanami-router
    class HelloApp
    def call(env)
    [200, { **env }, ['Hello!']]
    end
    end
    router = Hanami::Router.new
    router.get '/', to: 'hello_app'
    

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60. # sinatra
    class Hello < Sinatra
    get '/' do
    'Hello!'
    end
    end
    

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61. # hanami
    Hanami::Router.new do
    get '/' do
    [200, { **env }, ['Hello!']]
    end
    end
    

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62. Controllers
    

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63. class UsersController < AC
    def new
    end
    def send_sms
    end
    private
    def user_params
    end
    end
    Controllers: Rails
    

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64. Controllers: hanami action
    module Web::Controllers::Board
    class Index
    include Web::Action
    params do
    required(:email).filled
    end
    def call(params)
    end
    end
    end
    

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65. Controllers: hanami action
    module Web::Controllers::Board
    class Index
    include Web::Action
    params do
    required(:email).filled
    end
    def call(params)
    end
    end
    end
    

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66. Controllers: hanami action
    module Web::Controllers::Board
    class Index
    include Web::Action
    params do
    required(:email).filled
    end
    def call(params)
    end
    end
    end
    

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67. Model
    

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68. class User < ActiveRecord::Base
    include Gravtastic
    before_destroy :yank_gems
    has_many :rubygems, through: :ownerships
    validates :name, presence: true
    # ...
    end
    Model: Rails
    

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69. class User < ActiveRecord::Base
    include Gravtastic
    before_destroy :yank_gems
    has_many :rubygems, through: :ownerships
    validates :name, presence: true
    # ...
    end
    Model: Rails
    

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70. class User < ActiveRecord::Base
    include Gravtastic
    before_destroy :yank_gems
    has_many :rubygems, through: :ownerships
    validates :name, presence: true
    # ...
    end
    Model: Rails
    

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71. class User < ActiveRecord::Base
    include Gravtastic
    before_destroy :yank_gems
    has_many :rubygems, through: :ownerships
    validates :name, presence: true
    # ...
    end
    Model: Rails
    

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72. class User < ActiveRecord::Base
    include Gravtastic
    before_destroy :yank_gems
    has_many :rubygems, through: :ownerships
    validates :name, presence: true
    # ...
    end
    Model: Rails
    

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73. Model: hanami
    hanami + ROM = ❤
    rom-rb.org
    

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74. Model: hanami entity
    class User < Hanami::Entity
    # ...
    end
    

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75. Model: hanami entity
    >> user = User.new(id: 1)
    => #1}>
    >> user.id
    => 1
    >> user.id = 1
    NoMethodError: undefined method `id=' for
    #1}>
    Did you mean? id
    

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76. Model: hanami entity
    >> user = User.new(id: 1)
    => #1}>
    >> user.id
    => 1
    >> user.id = 1
    NoMethodError: undefined method `id=' for
    #1}>
    Did you mean? id
    

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77. Model: hanami entity
    >> user = User.new(id: 1)
    => #1}>
    >> user.id
    => 1
    >> user.id = 1
    NoMethodError: undefined method `id=' for
    #1}>
    Did you mean? id
    

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78. class UserRepository < Hanami::Repository
    associations do
    has_many :books
    end
    def find_by_name(name)
    users # => ROM relation
    users.where(name: name).limit(1).order { id }.one
    end
    end
    Model: hanami repository
    

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79. >> repo = UserRepository.new
    => #
    >> repo.find(1)
    => #@attributes={…}>
    >> repo.find_by_name(‘Anton’)
    => #@attributes={…}>
    Model: hanami repository
    

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80. View
    

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81. View: Rails
    rails view (partials?)
    +
    rails helper
    

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82. View: Hanami
    hanami view (ruby class)
    +
    templates
    

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83. Assets
    

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84. webpacker
    vs
    hanami-webpack
    

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85. Adding custom CLI commands
    

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86. Rails
    ?
    

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87. Hanami
    

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88. Business logic
    

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90. Rails
    

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92. youtu.be/DfU6H-8qal8
    

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93. TLDR
    

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94. service objects
    

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95. Nobody knows what it is
    

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96. Zero standardization
    

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98. #call
    #perform
    #handle
    #run
    #run!
    #for
    #execute!
    #anything
    

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99. Service.call(params)
    Service.new.call(params)
    Service.new(params).call
    Service.new(options).call(params)
    Service.new(dependencies).call(params)
    

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100. What should service object return?
     

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101. bool
     object
     hash
     array
     monad
     result object
     nothing
     

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102. Hanami
     

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103. Dependency injection
     

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104. Dependency injection
     

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105. Isolated part of your code
     

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106. github.com/discourse/discourse
     

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113. Dependency injection
     

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114. Dependency injection
     

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119. The act of putting a
     something,
     into a someone
     

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120. Dependency injection
     

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121. The act of putting a
     dependency,
     into a code
     

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122. Examples
     

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123. def greeting(id)
     user = User.find(id)
     “Hello, #{user.name}”
     end
     

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124. puts greeting(1337)
     # => Hello, Anton
     

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125. def greeting(id)
     user = User.find(id)
     “Hello, #{user.name}”
     end
     

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126. def greeting(id, relation: User)
     user = relation.find(id)
     “Hello, #{user.name}”
     end
     

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127. def greeting(id, relation: User)
     user = relation.find(id)
     “Hello, #{user.name}”
     end
     

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128. def greeting(id, relation: User)
     user = relation.find(id)
     “Hello, #{user.name}”
     end
     

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129. puts greeting(1337)
     # => Hello, Anton
     

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130. puts greeting(
     1337, relation: UserMemory
     )
     # => Hello, Memory
     

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131. Congrats
     

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132. You know everything about
     dependency injection
     

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135. More here
     t.me/pepegramming/228
     

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136. github.com/dry-rb/dry-auto_inject
     

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137. class Service
     attr_reader :repo
     def initialize(repo: UserRepo.new)
     @repo = repo
     end
     def call(payload)
     user = repo.find(payload[:id])
     # …
     end
     end
     

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138. class Service
     include DEPS[repo: :user_repo]
     def call(payload)
     user = repo.find(payload[:id])
     # …
     end
     end
     

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139. class Service
     include DEPS[repo: :user_repo]
     def call(payload)
     user = repo.find(payload[:id])
     # …
     end
     end
     

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140. IoC / DI container
     

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141. IoC == Inversion of control
     

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142. Object which know
     about project
     dependencies
     

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144. Simple
     implementation
     

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145. Hash.new
     

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146. Container = {}
     Container[:redis] = Redis.new(params)
     Container[:redis]
     

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147. No booting control
     Mutable
     No injecting control
     

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148. dry-system
     

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149. Register
     dependency
     

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150. Container = Dry::Container.new
     Container.register(:redis, Redis.new(params))
     # => okay
     Container.register(:redis, MockRedis.new)
     # => raice error
     

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151. Container = Dry::Container.new
     Container.register(:redis, Redis.new(params))
     # => okay
     Container.register(:redis, MockRedis.new)
     # => raice error
     

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152. Inject dependency
     

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153. class Service
     include Container[redis: :redis]
     def call(payload)
     user = redis.get(payload[:id])
     # …
     end
     end
     

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154. class Service
     include Container[redis: :redis]
     def call(payload)
     user = redis.get(payload[:id])
     # …
     end
     end
     

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155. class Service
     include Container[redis: :redis]
     def call(payload)
     user = redis.get(payload[:id])
     # …
     end
     end
     

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156. class Service
     include Container[redis: :redis]
     def call(payload)
     user = redis.get(payload[:id])
     # …
     end
     end
     

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157. More here
     

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159. And here
     

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160. dry-rb.org/gems/dry-system/
     

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161. Why?
     

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162. Container Architecture
     +
     Dependency management
     

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163. DDD
     

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166. Separate domains
     for different business
     values
     

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167. Each domain
     isolated from others
     

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168. pros
     easy to create separated
     services: just replace code
     domains + containers = ❤
     

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169. cons
     hard to start
     so much files™
     

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171. http is a small part
     of system
     

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173. websockets
     rack
     background processing
     ETL
     …
     

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174. They all use business
     logic
     

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177. Hanami
     

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178. Pros and Cons
     

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179. No magic
     

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180. module Web::Controllers::Board
     class Index
     include Web::Action
     def call(params)
     end
     end
     end
     

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181. Rails action test
     describe BoardController do
     let(:response){ get :index }
     it 'is successful' do
     expect(response).to eq(200)
     end
     end
     

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182. Action test
     describe Web::Controllers::Board::Index do
     let(:action){ Board::Index.new }
     let(:params){ Hash[] }
     it 'is successful' do
     response = action.call(params)
     expect(response[0]).to eq(200)
     end
     end
     

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183. Action test
     describe Web::Controllers::Board::Index do
     let(:action){ Board::Index.new }
     let(:params){ Hash[] }
     it 'is successful' do
     response = action.call(params)
     expect(response[0]).to eq(200)
     end
     end
     

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184. Action test
     describe Web::Controllers::Board::Index do
     let(:action){ Board::Index.new }
     let(:params){ Hash[] }
     it 'is successful' do
     response = action.call(params)
     expect(response[0]).to eq(200)
     end
     end
     

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185. No monkey-patching
     

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186. Best practices
     

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187. The logic separation
     

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188. transport logic =/= business logic
     

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189. TDD
     

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192. Cons
     

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193. Architecture
     Implementation
     Ecosystem
     

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194. Architecture
     

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195. Validations in actions
     

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206. How to fix it?
     

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207. Have no ideas
     

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208. Data transfer objects
     (DTO)
     

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209. Validate payload and create
     an object
     

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214. Only HTTP transport
     

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220. Will fixed soon
     

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221. Implementation
     

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222. Hanami Model
     

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223. Wrapped on rom 3.0
     

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224. Associations
     

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225. How we solve it?
     

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226. Use rom instead
     hanami-model
     

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227. Ecosystem
     

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228. It’s grow but we need
     gems
     

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229. Example: auth libs
     like devise
     

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230. Tip: good idea to
     start OSS career
     

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231. Also, we have some
     opensourse project
     for learning
     

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232. octostar.herokuapp.com
     

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233. contributors.hanamirb.org
     

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234. rubyjobs.dev
     

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235. More on
     awesome-hanami.org
     

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236. Conclusion
     

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237. Ruby lives outside rails
     

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238. Rails - fast prototyping or legacy
     Hanami - small or well maintained projects
     

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239. Hanami can be
     useful for improving
     your skills
     

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240. Because you can
     use hanami’s ideas in
     rails
     

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241. Or starting OSS
     career
     

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242. git.io/JeShe
     

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