RubyConf China 17/11/2012 - Become a Better Developer You Can

Video: https://www.youtube.com/watch?v=DeBsmdDmB9A

Transcript

1. @fredwu
   Development Team Lead
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2. “BECOME A BETTER
   DEVELOPER
   YOU CAN”
   - Yoda
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3. MY BACKGROUND
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4. 4
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5. 4
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6. • 1997 Got my first computer (Intel Pentium MMX 166Mhz)
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7. • 1997 Got my first computer (Intel Pentium MMX 166Mhz)
   • 1997 Started using BBS (上海热线) and the Internet via 33.6Kbps modem
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8. • 1997 Got my first computer (Intel Pentium MMX 166Mhz)
   • 1997 Started using BBS (上海热线) and the Internet via 33.6Kbps modem
   • 1997 Made my first ever HTML web page in Microsoft Frontpage Express
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9. • 1997 Got my first computer (Intel Pentium MMX 166Mhz)
   • 1997 Started using BBS (上海热线) and the Internet via 33.6Kbps modem
   • 1997 Made my first ever HTML web page in Microsoft Frontpage Express
   • 1998 Moved to Australia
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10. • 1997 Got my first computer (Intel Pentium MMX 166Mhz)
    • 1997 Started using BBS (上海热线) and the Internet via 33.6Kbps modem
    • 1997 Made my first ever HTML web page in Microsoft Frontpage Express
    • 1998 Moved to Australia
    • 2001 Started playing with Perl (雷傲), ASP (动⺴⽹网) and PHP (Discuz!) forum software
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11. • 1997 Got my first computer (Intel Pentium MMX 166Mhz)
    • 1997 Started using BBS (上海热线) and the Internet via 33.6Kbps modem
    • 1997 Made my first ever HTML web page in Microsoft Frontpage Express
    • 1998 Moved to Australia
    • 2001 Started playing with Perl (雷傲), ASP (动⺴⽹网) and PHP (Discuz!) forum software
    • 2004 Started learning PHP and JavaScript in TAFE (pre-university bridge)
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12. • 1997 Got my first computer (Intel Pentium MMX 166Mhz)
    • 1997 Started using BBS (上海热线) and the Internet via 33.6Kbps modem
    • 1997 Made my first ever HTML web page in Microsoft Frontpage Express
    • 1998 Moved to Australia
    • 2001 Started playing with Perl (雷傲), ASP (动⺴⽹网) and PHP (Discuz!) forum software
    • 2004 Started learning PHP and JavaScript in TAFE (pre-university bridge)
    • 2006 Started working part-time as a junior developer whilst studying in university
    4
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13. • 1997 Got my first computer (Intel Pentium MMX 166Mhz)
    • 1997 Started using BBS (上海热线) and the Internet via 33.6Kbps modem
    • 1997 Made my first ever HTML web page in Microsoft Frontpage Express
    • 1998 Moved to Australia
    • 2001 Started playing with Perl (雷傲), ASP (动⺴⽹网) and PHP (Discuz!) forum software
    • 2004 Started learning PHP and JavaScript in TAFE (pre-university bridge)
    • 2006 Started working part-time as a junior developer whilst studying in university
    • 2006 Discovered Ruby and Ruby on Rails, and switched to OS X because of Textmate
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14. • 1997 Got my first computer (Intel Pentium MMX 166Mhz)
    • 1997 Started using BBS (上海热线) and the Internet via 33.6Kbps modem
    • 1997 Made my first ever HTML web page in Microsoft Frontpage Express
    • 1998 Moved to Australia
    • 2001 Started playing with Perl (雷傲), ASP (动⺴⽹网) and PHP (Discuz!) forum software
    • 2004 Started learning PHP and JavaScript in TAFE (pre-university bridge)
    • 2006 Started working part-time as a junior developer whilst studying in university
    • 2006 Discovered Ruby and Ruby on Rails, and switched to OS X because of Textmate
    • 2008 Started professionally as a web developer (HTML, CSS, PHP and JavaScript)
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15. • 1997 Got my first computer (Intel Pentium MMX 166Mhz)
    • 1997 Started using BBS (上海热线) and the Internet via 33.6Kbps modem
    • 1997 Made my first ever HTML web page in Microsoft Frontpage Express
    • 1998 Moved to Australia
    • 2001 Started playing with Perl (雷傲), ASP (动⺴⽹网) and PHP (Discuz!) forum software
    • 2004 Started learning PHP and JavaScript in TAFE (pre-university bridge)
    • 2006 Started working part-time as a junior developer whilst studying in university
    • 2006 Discovered Ruby and Ruby on Rails, and switched to OS X because of Textmate
    • 2008 Started professionally as a web developer (HTML, CSS, PHP and JavaScript)
    • 2010 Started programming in Ruby full time (mostly)
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16. • 1997 Got my first computer (Intel Pentium MMX 166Mhz)
    • 1997 Started using BBS (上海热线) and the Internet via 33.6Kbps modem
    • 1997 Made my first ever HTML web page in Microsoft Frontpage Express
    • 1998 Moved to Australia
    • 2001 Started playing with Perl (雷傲), ASP (动⺴⽹网) and PHP (Discuz!) forum software
    • 2004 Started learning PHP and JavaScript in TAFE (pre-university bridge)
    • 2006 Started working part-time as a junior developer whilst studying in university
    • 2006 Discovered Ruby and Ruby on Rails, and switched to OS X because of Textmate
    • 2008 Started professionally as a web developer (HTML, CSS, PHP and JavaScript)
    • 2010 Started programming in Ruby full time (mostly)
    • 2010 Started contributing to many open source ruby projects, including Ruby on Rails
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17. AUSTRALIA HAS A STRONG
    RUBY COMMUNITY
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18. 6
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19. Dr Nic Williams
    Author of Rails Textmate bundle,
    works at Engine Yard
    Ryan Bigg
    Author of Rails 3 in Action,
    2011 Ruby Hero
    Pat Allan
    Author of Thinking Sphinx,
    2009 Ruby Hero
    Xavier Shay
    Author of Cane and Enki,
    works at Square
    Ben Schwarz
    Member of W3C’s
    CSS Working Group
    Darcy Laycock
    Author of API Smith,
    2011 Ruby Hero
    Justin French
    Author of Formtastic
    Daniel Neighman
    Author of Warden,
    works at Square
    Ben Hoskings
    Author of Babushka
    Marcus Crafter
    Author of Sprinkle
    Charlie Somerville
    Author of Slash language,
    a talented 18 year old!
    Jack Chen (Chendo)
    Contributor to iTerm2
    Mikel Lindsaar
    Author of Mail,
    rails core committer
    John Barton
    Cofounder of Goodfil.ms,
    dev manager of Envato for 3+ years
    Paul Annesley
    Built 99designs,
    works at SitePoint
    Gareth Townsend
    Founder of Melbourne Cocoaheads
    Ivan Vanderbyl
    Founder of Crashlog
    Glen Maddern
    Cofounder of Goodfil.ms
    Alan Harper
    Author of Rubyzip
    James Healy
    Author of PDF::Reader,
    maintainer of Prawn
    Florian Hanke
    Author of Picky
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20. DISCLAIMER
    I am still a n00b. ⼩小⼩小菜⻦鸟。
    But I care, so I share. 抛砖引⽟玉。
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21. THOUGHTS ON
    SOFTWARE DEVELOPMENT
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22. THOUGHTS ON
    SOFTWARE DEVELOPMENT
    • Second system syndrome - avoid total rewrites.
    第⼆二系统综合症——避免重写。
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23. THOUGHTS ON
    SOFTWARE DEVELOPMENT
    • Second system syndrome - avoid total rewrites.
    第⼆二系统综合症——避免重写。
    • Software engineering is like playing Starcraft - always check your mini-map.
    软件⼯工程有如星际争霸——需经常关注迷你地图，以⼤大局为重。
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24. THOUGHTS ON
    SOFTWARE DEVELOPMENT
    • Second system syndrome - avoid total rewrites.
    第⼆二系统综合症——避免重写。
    • Software engineering is like playing Starcraft - always check your mini-map.
    软件⼯工程有如星际争霸——需经常关注迷你地图，以⼤大局为重。
    • Experience is as important as talent, if not more important.
    经验与天赋同重要。
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25. THOUGHTS ON
    SOFTWARE DEVELOPMENT
    • Second system syndrome - avoid total rewrites.
    第⼆二系统综合症——避免重写。
    • Software engineering is like playing Starcraft - always check your mini-map.
    软件⼯工程有如星际争霸——需经常关注迷你地图，以⼤大局为重。
    • Experience is as important as talent, if not more important.
    经验与天赋同重要。
    • Technical debt is a debt, the longer you wait, the more interests you pay.
    技术债务——拖⽋欠越久，偿还越多。
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26. THOUGHTS ON
    SOFTWARE DEVELOPMENT
    • Second system syndrome - avoid total rewrites.
    第⼆二系统综合症——避免重写。
    • Software engineering is like playing Starcraft - always check your mini-map.
    软件⼯工程有如星际争霸——需经常关注迷你地图，以⼤大局为重。
    • Experience is as important as talent, if not more important.
    经验与天赋同重要。
    • Technical debt is a debt, the longer you wait, the more interests you pay.
    技术债务——拖⽋欠越久，偿还越多。
    • Choose the application architecture wisely.
    谨慎选择软件架构。
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27. APPLICATION ARCHITECTURE
    SHOWCASE
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28. APPLICATION ARCHITECTURE
    SHOWCASE
    • We need a profile system to hold user data.
    ⽤用户帐户系统。
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29. APPLICATION ARCHITECTURE
    SHOWCASE
    • We need a profile system to hold user data.
    ⽤用户帐户系统。
    • The profile system will potentially be used standalone.
    ⽤用户帐户系统未来可能会被独⽴立使⽤用。
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30. APPLICATION ARCHITECTURE
    SHOWCASE
    • We need a profile system to hold user data.
    ⽤用户帐户系统。
    • The profile system will potentially be used standalone.
    ⽤用户帐户系统未来可能会被独⽴立使⽤用。
    • We need plugin-able “modules”.
    需可插⼊入式模块系统。
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31. APPLICATION ARCHITECTURE
    SHOWCASE
    • We need a profile system to hold user data.
    ⽤用户帐户系统。
    • The profile system will potentially be used standalone.
    ⽤用户帐户系统未来可能会被独⽴立使⽤用。
    • We need plugin-able “modules”.
    需可插⼊入式模块系统。
    • There will potentially be 3rd party modules.
    未来可能会有第三⽅方开发的模块。
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32. APPLICATION ARCHITECTURE
    SHOWCASE
    • We need a profile system to hold user data.
    ⽤用户帐户系统。
    • The profile system will potentially be used standalone.
    ⽤用户帐户系统未来可能会被独⽴立使⽤用。
    • We need plugin-able “modules”.
    需可插⼊入式模块系统。
    • There will potentially be 3rd party modules.
    未来可能会有第三⽅方开发的模块。
    • Of course, the development timeline is tight.
    开发周期很紧凑。
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33. SOLUTION I
    THE PERFECT WAY
    Profile (API) Platform
    Module
    Module
    Module
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34. PERFECT? NO!
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35. PERFECT? NO!
    • Longer development time.
    开发周期过⻓长。
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36. PERFECT? NO!
    • Longer development time.
    开发周期过⻓长。
    • Can’t guarantee the usefulness of the API layer for 3rd party
    developers.
    不可预知 API 层在未来是否还可有效利⽤用。
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37. PERFECT? NO!
    • Longer development time.
    开发周期过⻓长。
    • Can’t guarantee the usefulness of the API layer for 3rd party
    developers.
    不可预知 API 层在未来是否还可有效利⽤用。
    • More complexity == more chances to screw up.
    系统越复杂，越容易出错。
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38. SOLUTION II
    THE EASY WAY
    Platform
    Profile
    Module
    Module
    Module
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39. EASY,
    BUT FOR HOW LONG?
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40. EASY,
    BUT FOR HOW LONG?
    • One app is more difficult to scale out.
    单⼀一系统相对较难向外扩展。
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41. EASY,
    BUT FOR HOW LONG?
    • One app is more difficult to scale out.
    单⼀一系统相对较难向外扩展。
    • It is also more difficult to assign tasks.
    单⼀一系统相对较难安排团队成员任务。
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42. EASY,
    BUT FOR HOW LONG?
    • One app is more difficult to scale out.
    单⼀一系统相对较难向外扩展。
    • It is also more difficult to assign tasks.
    单⼀一系统相对较难安排团队成员任务。
    • It is more likely to have leaky code.
    单⼀一系统相对更难有效封装。
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43. SOLUTION III
    THE CHOSEN WAY
    Profile (API) Platform
    Module
    Module
    Module
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44. A BALANCED SOLUTION
    IS A GOOD SOLUTION
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45. A BALANCED SOLUTION
    IS A GOOD SOLUTION
    • Don’t over-engineer.
    避免过度⼯工程。
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46. A BALANCED SOLUTION
    IS A GOOD SOLUTION
    • Don’t over-engineer.
    避免过度⼯工程。
    • Good degree of separation of concern.
    注重关注点分离。
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47. A BALANCED SOLUTION
    IS A GOOD SOLUTION
    • Don’t over-engineer.
    避免过度⼯工程。
    • Good degree of separation of concern.
    注重关注点分离。
    • Internal interfaces are easier than external APIs:
    内部接⼝口相对外部 API 更易开发：
    ‣ @gateway ||= PlatformModuleGateway.new(args)
    ‣ mod = module_controller(module_name).new(args)
    ‣ mod.validate_input
    ‣ mod.render_view
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48. OOPS!
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49. OOPS!
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50. CRAP PRINCIPLES
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51. 19
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52. Contrast 对⽐比度
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53. Contrast 对⽐比度
    Repetition 重复度
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54. Contrast 对⽐比度
    Repetition 重复度
    Alignment 排列度
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55. Contrast 对⽐比度
    Repetition 重复度
    Alignment 排列度
    Proximity 接近度
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56. SOLID PRINCIPLES
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57. 21
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58. Single responsibility 单⼀一责任
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59. Single responsibility 单⼀一责任
    Open/close 开闭
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60. Single responsibility 单⼀一责任
    Open/close 开闭
    Liskov substitution ⾥里⽒氏替换
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61. Single responsibility 单⼀一责任
    Open/close 开闭
    Liskov substitution ⾥里⽒氏替换
    Interface segregation 接⼝口分离
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62. Single responsibility 单⼀一责任
    Open/close 开闭
    Liskov substitution ⾥里⽒氏替换
    Interface segregation 接⼝口分离
    Dependency inversion 依赖倒置
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63. FOUR SIMPLE RULES
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64. 23
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65. Passes all the tests.
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66. Passes all the tests.
    Contains no duplication.
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67. Passes all the tests.
    Contains no duplication.
    Expresses the intent.
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68. Passes all the tests.
    Contains no duplication.
    Expresses the intent.
    Minimises the number of classes and methods.
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69. Until you have learnt Ruby first.
    DO NOT LEARN RAILS
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70. Practice, Practice and Practice
    FAST TRACK
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71. CONTRIBUTE TO
    OPEN SOURCE PROJECTS
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72. CONTRIBUTE TO
    OPEN SOURCE PROJECTS
    • Reading code is just as important as writing code.
    阅读代码与编写代码同重要。
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73. CONTRIBUTE TO
    OPEN SOURCE PROJECTS
    • Reading code is just as important as writing code.
    阅读代码与编写代码同重要。
    • Learn from the masters.
    向⼤大师们学习。
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74. CONTRIBUTE TO
    OPEN SOURCE PROJECTS
    • Reading code is just as important as writing code.
    阅读代码与编写代码同重要。
    • Learn from the masters.
    向⼤大师们学习。
    • Take some, give some - sharing is awesome.
    不断收获的同时，别忘了付出。
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75. CONTRIBUTE TO
    OPEN SOURCE PROJECTS
    • Reading code is just as important as writing code.
    阅读代码与编写代码同重要。
    • Learn from the masters.
    向⼤大师们学习。
    • Take some, give some - sharing is awesome.
    不断收获的同时，别忘了付出。
    • Make things more useful for yourself therefore for others too.
    对⾃自⼰己有⽤用的东⻄西，也许对他⼈人也有⽤用。
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76. CONTRIBUTE TO
    OPEN SOURCE PROJECTS
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77. CONTRIBUTE TO
    OPEN SOURCE PROJECTS
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78. CONTRIBUTE TO
    OPEN SOURCE PROJECTS
    PHP CodeIgniter
    PHP Kohana
    PHP Vanilla Forums
    PHP Yii Framework
    JAVASCRIPT AutoSuggest
    RUBY Ruby on Rails
    RUBY RailsConfig
    RUBY Slim
    RUBY ORM Adapter
    RUBY Delayed Job
    RUBY Parallel Tests
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79. OPEN SOURCE
    YOUR OWN WORK
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80. OPEN SOURCE
    YOUR OWN WORK
    • Made something useful? Release it!
    写了有⽤用的好玩意⼉儿？发布吧，勇敢的少年！
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81. OPEN SOURCE
    YOUR OWN WORK
    • Made something useful? Release it!
    写了有⽤用的好玩意⼉儿？发布吧，勇敢的少年！
    • Be critisied of your work, and learn from mistakes.
    虚⼼心接受意⻅见与批评，由错误中学习。
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82. OPEN SOURCE
    YOUR OWN WORK
    • Made something useful? Release it!
    写了有⽤用的好玩意⼉儿？发布吧，勇敢的少年！
    • Be critisied of your work, and learn from mistakes.
    虚⼼心接受意⻅见与批评，由错误中学习。
    • Be proud of your work, and be recognised.
    为⾃自⼰己的⾟辛苦成果感到⾃自豪。
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83. OPEN SOURCE
    YOUR OWN WORK
    • Made something useful? Release it!
    写了有⽤用的好玩意⼉儿？发布吧，勇敢的少年！
    • Be critisied of your work, and learn from mistakes.
    虚⼼心接受意⻅见与批评，由错误中学习。
    • Be proud of your work, and be recognised.
    为⾃自⼰己的⾟辛苦成果感到⾃自豪。
    • Make a little dent in the universe.
    ⼀一点⼩小⼩小的贡献的话，可以哟〜～
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84. OPEN SOURCE
    YOUR OWN WORK
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85. OPEN SOURCE
    YOUR OWN WORK
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86. OPEN SOURCE
    YOUR OWN WORK
    RUBY Action Throttler Throttle actions based on configurable duration and limit.
    RUBY Angel Nest An open source 'clone' of AngelList.
    RUBY API Taster Visually test your Rails application's API.
    RUBY AppReset Resets (and if available, seeds) your databases.
    RUBY Bustle Activities recording and retrieving using a simple Pub/Sub-like interface.
    RUBY Datamappify Turn ActiveRecord into DataMapper (sort of)!
    RUBY Haml2Slim Convert Haml templates to Slim templates.
    RUBY Inherited Resources Views DRY your view files!
    RUBY Ruby Decorators Ruby method decorators inspired by Python.
    RUBY Security Guard A collection of useful tools for auditing data.
    RUBY Slim Bundle A Textmate / Sublime Text bundle for Slim.
    PHP Authlite A lightweight, flexible Auth module for Kohana.
    PHP KThrottler Throttle actions based on configurable duration and limit.
    PHP PHamlP A bridge between Kohana and PHamlP.
    JAVASCRIPT Endless Scroll Endless / infinite scrolling solution for jQuery.
    JAVASCRIPT Inline Confirmation Less obtrusive confirmation dialogues.
    JAVASCRIPT Skinny Coffee Machine A simple state machine with observers.
    JAVASCRIPT Slideshow Lite A lightweight slideshow plugin for jQuery.
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88. Credit: travis-ci.com
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89. SLIM
    A Case Study
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90. 32
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91. 33
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92. 33
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93. 33
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94. 34
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95. 35
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96. 36
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97. 37
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98. 38
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99. 39
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100. 40
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101. 41
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102. 42
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103. 43
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104. 44
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105. 45
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106. 46
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107. 47
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108. 48
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109. DO FREELANCE WORK
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110. DO FREELANCE WORK
     • Like open source work, but with deadlines and pressure.
     截⽌止期限与压⼒力。
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111. DO FREELANCE WORK
     • Like open source work, but with deadlines and pressure.
     截⽌止期限与压⼒力。
     • Like open source work, but with some $$$.
     赚点外快。
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112. DO FREELANCE WORK
     • Like open source work, but with deadlines and pressure.
     截⽌止期限与压⼒力。
     • Like open source work, but with some $$$.
     赚点外快。
     • Be involved in projects different to those at your day job.
     不同的项⺫⽬目体验与经验。
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113. DO FREELANCE WORK
     • Like open source work, but with deadlines and pressure.
     截⽌止期限与压⼒力。
     • Like open source work, but with some $$$.
     赚点外快。
     • Be involved in projects different to those at your day job.
     不同的项⺫⽬目体验与经验。
     • Communication skills with your clients.
     客户沟通经验。
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114. DO FREELANCE WORK
     • Like open source work, but with deadlines and pressure.
     截⽌止期限与压⼒力。
     • Like open source work, but with some $$$.
     赚点外快。
     • Be involved in projects different to those at your day job.
     不同的项⺫⽬目体验与经验。
     • Communication skills with your clients.
     客户沟通经验。
     • Communication skills with your remote team members.
     远程团队沟通经验。
     49
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115. DO FREELANCE WORK
     49
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116. AND LASTLY,
     YOUR DAY JOB
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117. AND LASTLY,
     YOUR DAY JOB
     • You spend most of your hours awake at your day job, make it
     count!
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118. AND LASTLY,
     YOUR DAY JOB
     • You spend most of your hours awake at your day job, make it
     count!
     • Know what you are looking for.
     知道⾃自⼰己想要什么。
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119. AND LASTLY,
     YOUR DAY JOB
     • You spend most of your hours awake at your day job, make it
     count!
     • Know what you are looking for.
     知道⾃自⼰己想要什么。
     • What can you get out of working at the company?
     在这家公司⼯工作，能学习到什么？
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120. AND LASTLY,
     YOUR DAY JOB
     • You spend most of your hours awake at your day job, make it
     count!
     • Know what you are looking for.
     知道⾃自⼰己想要什么。
     • What can you get out of working at the company?
     在这家公司⼯工作，能学习到什么？
     • What did you get out of working at the company?
     在这家公司⼯工作，学习到了什么？
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121. AND LASTLY,
     YOUR DAY JOB
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122. PERSONAL BRANDING
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123. PERSONAL BRANDING
     • Designers have online portfolios, what about us developers?
     51
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124. PERSONAL BRANDING
     • Designers have online portfolios, what about us developers?
     • Blog - show me your thoughts!
     51
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125. PERSONAL BRANDING
     • Designers have online portfolios, what about us developers?
     • Blog - show me your thoughts!
     • Twitter/Weibo - show me your passion!
     51
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126. PERSONAL BRANDING
     • Designers have online portfolios, what about us developers?
     • Blog - show me your thoughts!
     • Twitter/Weibo - show me your passion!
     • GitHub - show me your code!
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127. PERSONAL BRANDING
     • Designers have online portfolios, what about us developers?
     • Blog - show me your thoughts!
     • Twitter/Weibo - show me your passion!
     • GitHub - show me your code!
     • LinkedIn - show me your resume!
     51
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128. PERSONAL BRANDING
     52
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129. PERSONAL BRANDING
     • Build up your network
     拓展交际圈
     • Establish your reputation
     树⽴立好名声
     • People will endorse your
     work
     让更多⼈人赞誉你的成果
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130. 53
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131. We can talk the talk
     53
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132. LET’S WALK THE WALK
     We can talk the talk
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133. 54
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134. How about a fun little task...
     54
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135. A SMALL CODE TEST
     How about a fun little task...
     54
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136. 55
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137. 55
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138. 55
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139. 55
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140. A BAD SOLUTION
     56
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141. A BAD SOLUTION
     57
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142. ANOTHER BAD SOLUTION
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143. ANOTHER BAD SOLUTION
     59
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144. A GOOD SOLUTION
     60
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145. A GOOD SOLUTION
     61
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146. ANOTHER GOOD SOLUTION
     62
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147. ANOTHER GOOD SOLUTION
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148. 64
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149. And behold, for a solution that...
     64
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150. BLOWS YOUR MIND ޵䙽੧໨ʂ
     And behold, for a solution that...
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151. A 坑爹 SOLUTION
     65
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152. A 坑爹 SOLUTION
     66
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153. A 坑爹 SOLUTION
     66
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154. A 坑爹 SOLUTION
     67
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155. A 坑爹 SOLUTION
     你妹啊！
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156. 68
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157. Writing features is (usually) not enough...
     68
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158. WE NEED TESTS!
     Writing features is (usually) not enough...
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159. 69
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160. “I get paid for code that works, not for tests,
     so my philosophy is to test as little as possible
     to reach a given level of confidence.”
     -- Kent Beck
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161. EFFECTIVE TESTS
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162. EFFECTIVE TESTS
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163. EFFECTIVE TESTS
     • They are describing
     ActiveRecord behaviours.
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164. EFFECTIVE TESTS
     • They are describing
     ActiveRecord behaviours.
     • Allow mass assignments
     on foreign keys is wrong.
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165. EFFECTIVE TESTS
     • They are describing
     ActiveRecord behaviours.
     • Allow mass assignments
     on foreign keys is wrong.
     • They are testing how
     methods are implemented.
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166. EFFECTIVE TESTS
     • They are describing
     ActiveRecord behaviours.
     • Allow mass assignments
     on foreign keys is wrong.
     • They are testing how
     methods are implemented.
     • No confidence gained.
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167. DE-DUPLICATE
     TEST CASES
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168. DE-DUPLICATE
     TEST CASES
     72
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169. DE-DUPLICATE
     TEST CASES
     72
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170. DE-DUPLICATE
     TEST CASES
     72
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171. DE-DUPLICATE
     TEST CASES
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172. REFACTOR IN THE WILD
     Improve code readability and maintainability
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173. KEEP CONTROLLERS CLEAN
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174. 75
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175. 75
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176. 75
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177. 75
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178. 75
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179. 76
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180. A MORE COMPLETE EXAMPLE
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181. PROBLEM
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182. PROBLEM
     • A user has many trips
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183. PROBLEM
     • A user has many trips
     • Each trip may contain more than one stops, e.g.
     • Beijing -> Shanghai
     • Shanghai -> Hongkong
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184. PROBLEM
     • A user has many trips
     • Each trip may contain more than one stops, e.g.
     • Beijing -> Shanghai
     • Shanghai -> Hongkong
     • We only want to display the first stop from each trip
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185. 79
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186. 79
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187. 79
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188. 79
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189. 79
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190. 79
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191. 79
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192. 79
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193. 79
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194. 80
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195. 80
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196. 81
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197. 81
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198. A RUBY-CHINA EXAMPLE
     Albeit an old example, but nonetheless...
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199. 83
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200. 83
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201. 83
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202. 83
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203. 83
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204. 84
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205. 85
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206. REFACTOR + OPEN SOURCE
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207. IDENTIFY THE ISSUE
     87
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208. IDENTIFY THE ISSUE
     87
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209. ATTEMPT TO REFACTOR
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210. ATTEMPT TO REFACTOR
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211. ENCOUNTER
     UNEXPECTED PROBLEM
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212. ENSURE CODE INTEGRITY
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213. VERIFY THE ISSUE ELSEWHERE
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214. BEGIN DEBUGGING...
     92
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215. TRACK DOWN THE CAUSE
     93
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216. TRACK DOWN THE CAUSE
     93
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217. FIX IT!
     94
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218. FIX IT!
     94
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219. ENSURE IT ACTUALLY WORKS
     95
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220. ENSURE IT ACTUALLY WORKS
     95
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221. ENSURE IT DIDN’T
     BREAK ANYTHING
     96
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222. PULL REQUEST
     97
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223. EMBRACE RUBY
     We are a fortunate bunch.
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224. 99
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225. This portion of the slide is intentionally left blank.
     One function?!
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226. THANK YOU!
     :-)
     101
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