Off The Tracks

Challenging The Rails Mindset. Overloaded classes, POROs, domain objects, form objects, view inheritance, representers, and more.

Transcript

1. Off The Tracks @apotonick beta
3. Los Shotos!
4. A
6. An Example.
7. class User < ActiveRecord::Base # do this... # do that.. after_save :send_sms_notification end
8. class UsersController < Controller def create # ... @user.save end
9. class SmartMigration < Migration def change # ... user.save end
11. rake db:migrate
13. class User < ActiveRecord::Base # do this... # do that.. after_save :send_sms_notification end
18. I AM A FEATURE! A
22. A
23. Fear Of The Class
24. User User Form Validations Notifications
25. class User < ActiveRecord::Base # do this... # do that.. after_save :send_sms_notification end
26. class UsersController < Controller def create # ... @user.save notify_for(@user) end explicit*
27. class UsersController < Controller def create # ... @user.save notify_for(@user) end class UserSaveService def call user.save notify_for(user) end def notify_for(user)
28. class UsersController < Controller def create # ... UserSaveService.new(@user). call end
31. Domain Persistance
32. Want some drink, Steve? Oh, yes!
33. Cowboy Chat Message Conversation Response
34. Cowboy Chat Message Conversatio Response ActiveRecord:: Base
35. The Workflow. steve = Cowboy.new(name: "Steve") jim = Cowboy.new(name: "Jim") question = jim.say("Want some drink, Steve?") steve.respond("Oh, yes!", question)
36. PORO.
38. PORO.
39. class Cowboy < OpenStruct end
40. class Cowboy < OpenStruct end jim = Cowboy.new(name: "Jim") jim.name #=> “Jim”
41. Want some drink, Steve?
42. question = jim.say("Want some drink, Steve?")
43. class Cowboy < OpenStruct end
44. class Cowboy < OpenStruct def say(what) msg = Message.new( content: what) chat << msg end end
45. Want some drink, Steve? Oh, yes!
46. steve.respond("Oh, yes!", question)
47. class Cowboy < OpenStruct ... def respond(what, question) msg = Response.new( content: what, to: question) chat << msg end end
48. class Message < OpenStruct end class Response < Message end
49. Running The Workflow.
50. before do chat = [] end
51. before do chat = [] jim = Cowboy.new(name: “Jim”, chat: chat) steve = ... end
52. before do chat = [] jim = Cowboy.new(name: “Jim”, chat: chat) steve = ... qst = jim.say("Want some drink, Steve?") steve.respond("Oh, yes!", qst) end
53. it “is in right order” do chat.to_readable.should == <<BONFIRE Two cowboys were sitting at a campfire. Jim said “Want some drink, Steve?” whereas Steve, who was already loaded as shit, responded “Oh, yes!” and both were happy to the end of their days. BONFIRE end
54. bonfire$ rake Finished tests in 0.535564s, 5.6016 tests/s, 3.7344 assertions/s.
55. Domain Persistance A
56. datamappify
58. fredwu/datamappify
59. Thanks! Next?
60. class Message include Datamappify::Entity attribute :content, String end
61. class MessageRepository include Datamappify::Repository for_entity Message default_provider :ActiveRecord map_attribute :content, 'ActiveRecord::Message#text' end
62. message.content #=> “Oh yes!” (from persistance layer)
65. Your Message: “
66. class Message < ActiveRecord::Base validates :content, presence: true accepts_nested_attributes ... end
67. class Message < ActiveRecord::Base validates :content, presence: true accepts_nested_attributes ... end message.update_attributes(params)
68. class MessageForm < Reform::Form property :content, on: :message property :author, on: :message validates :message, presence: true end
69. msg = Message.find(1) @form = MessageForm.new(message: msg)
70. = simple_form_for @form do |f| = f.input :content
71. if @form.validate(params[:message])
72. if @form.validate(params[:message]) @form.save do |data, nested|
73. if @form.validate(params[:message]) @form.save do |data, nested| Message.new(content: data[:content])
74. apotonick/reform
75. Recent Messages “ “ Steve Jim
76. app/views/chat/show.html.haml = render :partial => "sidebar"
77. app/views/shared/_sidebar.html.haml .box %h3 Recent Messages = # render list with @chat.messages
78. app/views/shared/_sidebar.html.haml .box %h3 Recent Messages = # render list with @chat.messages .box = pie_chart_for(@chat)
79. Recent Messages “ “ Steve Jim
80. Recent Messages “ “ 81%
81. “ “ /home/ Steve Jim Recent Messages “ “ Steve Jim 81% /dashboard/ /chat/show /stats/ /chat/delete
82. app/views/shared/_sidebar.html.haml .box %h3 Recent Messages = # render list with @chat.messages .box - if draw_pie_chart? = pie_chart_for(@chat) - else = happiness_chart_for(@chat)
83. View Component.
84. class ChatsController < ApplicationController def show @chat = Chat.find ... end end
85. app/views/chat/show.html.haml = render :partial => "sidebar"
86. app/views/chat/show.html.haml = render :partial => "sidebar" app/views/chat/show.html.haml = render_cell :sidebar, :show, @chat
87. class SidebarCell < Cell::Rails def show(chat) @chat = chat render end end app/cells/sidebar/show.html.haml .box %h3 Recent Messages = # render list with @chat.messages .box - if draw_pie_chart? = pie_chart_for(@chat) - else = happiness_chart_for(@chat)
88. describe SidebarCell render_cell(:sidebar, :show, chat). should ... end
89. Recent Messages “ “ Steve Jim Recent Messages “ “ 81%
90. Override?
91. class Message def to_s msg = self.upper “<Message #{msg}>” end end
92. class Message def format self.upper end def to_s “<Message #{format}>” end end
93. class Message def format self.upper end def to_s “<Message #{format}>” end end class BetterMessage < Message def format self.lower end end
94. View Inheritance!
95. class MommyController < ApplicationContr.. def show ... render :partial => 'item' end end views/mommy/_item.erb ?
96. class MommyController < ApplicationContr.. def show ... render :partial => 'item' end end class ChildController < MommyController def show ... render :partial => 'item' end end views/child/_item.erb ? views/mommy/_item.erb ?
97. app/cells/sidebar/show.html.haml .box %h3 Recent Messages = # render list with @chat.messages .box - if draw_pie_chart? = pie_chart_for(@chat) - else = happiness_chart_for(@chat)
98. app/cells/sidebar/show.html.haml .box %h3 Recent Messages = # render list with @chat.messages = render :view => lower_box
99. app/cells/sidebar/lower_box.html.haml .box = pie_chart_for(@chat)
100. class FunnySidebarCell < SidebarCell end app/cells/funny_sidebar/lower_box.html.haml .box = happiness_chart_for(@chat)
101. app/views/chat/show.html.haml = render_cell :sidebar, :show, @chat Recent Messages “ “ Steve Jim
102. app/views/discuss/show.html.haml = render_cell :funny_sidebar, :show, @chat Recent Messages “ “ Steve Jim 81%
103. class FunnySidebarCell < SidebarCell end app/cells/funny_sidebar/lower_box.html.haml .box = happiness_chart_for(@chat)
105. apotonick/cells
108. class ChatsController < ApplicationController def show chat = Chat.find(params[:id]) @messages = chat.messages end end
109. # objectify 1. POST /messages
110. # objectify 1. POST /messages class IsDrinkerPolicy def allowed?(current_user) end
111. # objectify 1. POST /messages class IsDrinkerPolicy def allowed?(current_user) end class AddMessageService def call(current_user, params) end
112. # objectify 1. POST /messages class IsDrinkerPolicy def allowed?(current_user) end class AddMessageService def call(current_user, params) end class MessageResponder def call end
113. Route Render Policies Business
114. bitlove/objectify
115. List messages Message detail Send message API
116. {"content": "Want some drink, Steve?"} Render Document. Parse Document.
117. as_json(:include => ...) ActiveModel::Serializer params[..] strong_parameters
118. Representer.
119. GET http://messages/1 {"content": "Want some drink, Steve?", "created_at": "2012-09-28 19:40", }
120. module MessageRepresenter include Roar::Representer::JSON property :content property :created_at end
121. msg.extend(MessageRepresenter).to_json
122. msg.extend(MessageRepresenter).to_json #=> {"content": "Want some drink, Steve?", "created_at": "2012-09-28 19:40" }
123. msg = Message.new.extend(MessageRepresenter) msg.from_json('{"content": "Oh yes!"')
124. msg = Message.new.extend(MessageRepresenter) msg.from_json('{"content": "Oh yes!"') msg.content #=> "Oh yes!"
125. Oh no! Extend!
126. module MessageRepresenter include Roar::Representer::JSON property :content property :created_at end msg.extend(MessageRepresenter). to_json class < Roar::Decorator MessageRepresenter.new(msg).
127. Model Representer from_json to_json #content #created_at #content= #created_at=
128. More?
129. module MessageRepresenter include Roar::Representer::JSON property :content property :from, :extend => CowboyRepresenter, :class => Cowboy end
130. module ChatRepresenter include Roar::Representer::JSON collection :messages, :extend => MessageRepresenter end
131. module MessageRepresenter include Roar::Representer::XML property :content end
132. module MessageRepresenter include Roar::Representer::XML property :content end msg.extend(MessageRepresenter).to_xml #=> <message> <content>Yo!</content> </message
133. David! Hypermedia!
134. module MessageRepresenter include Roar::Representer::JSON::HAL property :content link :self do message_url(self) end end
135. msg.extend(MessageRepresenter).to_json #=> {"content": "Want some drink, Steve?", "_links" : {"self": {"href":"http://messages/1"}} }
136. module MessageRepresenter include Roar::Representer::JSON::Collection version “2.0” href { messages_url(self) } items(class: Message) do property :content end link :self do message_url(self) end end
137. [msg].extend(MessageRepresenter).to_json #=> {"collection" => { "version": "2.0", "href": "http://messages", "items": [ "data": [ {"name": "content", "value": "Want some drink, Steve?"}] "links" : {"self": {"href":"http://messages/rss"}} }
138. msg = Message.new msg.extend(MessageRepresenter). from_json(“{collection: ...”) msg.version #=> 2.0
139. apotonick/roar apotonick/representable
140. PORO objectify
141. Don't Fear The Class
142. @apotonick