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МГТУ

Anton Davydov
December 10, 2019
30

 МГТУ

Anton Davydov

December 10, 2019
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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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  5. View Slide

  6. View Slide

  7. View Slide

  8. View Slide

  9. View Slide

  10. View Slide

  11. View Slide

  12. View Slide

  13. Core member

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  14. View Slide

  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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  24. View Slide

  25. Luca Guidi
    github.com/jodosha

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

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  27. View Slide

  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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  33. View Slide

  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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  89. View Slide

  90. Rails

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  91. View Slide

  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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  97. View Slide

  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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  107. View Slide

  108. View Slide

  109. View Slide

  110. View Slide

  111. View Slide

  112. View Slide

  113. Dependency injection

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  114. Dependency injection

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  115. View Slide

  116. View Slide

  117. View Slide

  118. View Slide

  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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  133. View Slide

  134. View Slide

  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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  158. View Slide

  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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  164. View Slide

  165. View Slide

  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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  170. View Slide

  171. http is a small part
    of system

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  172. View Slide

  173. websockets
    rack
    background processing
    ETL

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  174. They all use business
    logic

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  175. View Slide

  176. View Slide

  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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  190. View Slide

  191. View Slide

  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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  196. View Slide

  197. View Slide

  198. View Slide

  199. View Slide

  200. View Slide

  201. View Slide

  202. View Slide

  203. View Slide

  204. View Slide

  205. View Slide

  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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  210. View Slide

  211. View Slide

  212. View Slide

  213. View Slide

  214. Only HTTP transport

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  215. View Slide

  216. View Slide

  217. View Slide

  218. View Slide

  219. View Slide

  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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