Rails Girls: Programming, Web Applications and Ruby on Rails

All the Buzzwords for the Workshop in about 30 minutes

Transcript

1. Programming, !
   Web Applications !
   and Ruby on Rails
   Marco Schaden!
   @donschado
   Saturday 24th May 2014
   

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2. Buzzwords!
   Web Application
   Ruby
   Rails
   Programming
   HTTP
   MVC
   Model
   View
   Controller
   Request
   Response
   Server
   Protocol
   ?
   ?
   ?
   ?
   ?
   ?
   ?
   HTML
   all the stuff in 30 minutes
   

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3. <>
   

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5. "It’s a boy’s thing"
   

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6. http://en.wikipedia.org/wiki/Women_in_computing
   

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7. http://en.wikipedia.org/wiki/Women_in_computing
   

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8. "You need a Ph.D. in mathematics"
   

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9. Not necessarily, but…
   communication:
   express your thoughts!
   and ideas properly
   passion:
   care about what you’re doing !
   and be curious how things work
   research:
   read documentation, !
   consult others or!
   just google it!
   problem solving:
   read the error messages !
   and be hungry to solve issues
   + patience
   

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11. programming: !
    !
    is telling a computer what to do!
    !
    (no magic involved)
    

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12. step-by-step instructions
    = program
    

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13. 3.times0do0
    0 print0"Hello0World!"0
    end
    

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14. Ruby
    A PROGRAMMER’S BEST FRIEND
    https://www.ruby-lang.org/
    

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15. imagine all the programming languages
    Ruby
    

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16. Why Ruby?
    Yukihiro Matsumoto !
    (Matz)
    Ruby is designed to be human-
    oriented. It reduces the burden of
    programming. It tries to push jobs
    back to machines.!
    !
    You can accomplish more tasks
    with less work, in smaller yet
    readable code.
    "Matz is nice so we are nice"
    

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17. Later we will learn more about Ruby…
    

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18. Web Application
    ?
    "A web application is a program that is displayed in a web browser. *
    Web applications are usually stored (and executed) on a web server.
    They can be accessed through the Internet 

    via a communication protocol such as HTTP. " 

    – Wikipedia
    

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19. HTTP?
    Hyper Text Transfer Protocol
    http://weheartit.com/entry/17157559
    

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20. HTTP
    Request Cycle
    In 4 Easy Steps
    (or how the internet works)
    

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21. your computer!
    running a browser of your choice
    a web server !
    somewhere on the internet!
    running a web application
    

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22. Hey$can$I$get$the$
    railsgirls$website?
    1
    http://railsgirls.com/cologne
    

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23. Hey$can$I$get$the$
    railsgirls$website?
    http$request$
    get,$post,$put,$delete,…
    1
    

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24. let$me$check…$.
    2
    

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25. $ok,$here$it$is
    http$response$
    generated$data,$HTML,$static$files,$images,…
    3
    

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26. 4
    Yay!
    

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27. GOT IT!
    

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29. David Heinemeier Hansson!
    (DHH)
    Why Rails?
    Rails is an attempt to mold the
    beauty and productiveness of
    Ruby into a framework for
    web applications.
    Rails emphasizes principles such as:!
    • convention over configuration!
    • don't repeat yourself (DRY)!
    • model - view - controller
    architecture (MVC)
    http://contributors.rubyonrails.org/
    http://rubyonrails.org/
    *over 3000 people have contributed:
    

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30. MVC?
    Model - View - Controller
    http://weheartit.com/entry/17157559
    

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32. Data$+$Logic
    Presentation
    Intermediary
    

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33. WHY…?!?!
    

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34. w/o MVC:
    http://media0.faz.net/ppmedia/aktuell/wirtschaft/777415979/1.1528426/default/wo-ist-noch-mal-die-rechnung-ein-buero-mit-sehr-kreativem-chaos.jpg
    

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35. with MVC:
    http://blog.meine-moebelmanufaktur.de/wp-content/uploads/2014/02/bunte_ordner_buero.jpg
    

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36. /
    Example MVC Web Application
    https://github.com/DonSchado/facebook-lite
    

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37. /
    Example MVC Web Application
    Layout
    View
    Post
    https://github.com/DonSchado/facebook-lite
    

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38. URL localhost:3000/
    (remember the request cycle?)
    

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39. GET /!
    Request
    

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40. Router
 get "/" => "welcome#index"!
    

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41. Controller
 class WelcomeController < ApplicationController!
    def index!
    $$@posts0= Post.all !
    end!
    end!
    

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42. Model
 class Post < ActiveRecord::Base!
    end!
    

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43. Database * create_table "posts" do |t|!
    t.text "content"!
    t.integer "user_id"!
    t.datetime "created_at"!
    t.datetime "updated_at"!
    end!
    

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44. Model
 class Post < ActiveRecord::Base!
    end!
    

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45. Controller
 class WelcomeController < ApplicationController!
    def index!
    $$@posts0= Post.all !
    end!
    end!
    

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46. View
 Das neuste aus ...$!
    !
    $
    $$<%=0@posts.each$do$|post|$%>0
    !
    !
    !
    !
    !
    00<%0end0%>$
    $
    $
    $$<%=$image_tag(post.user.avatar)$%>$
    $$<%=$post.user.name$%>$
    $$<%=$post.content$%>$
    
    

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47. $
    $$$
    $$$$$Facebook$Lite$
    $$$$$<%=$stylesheet_link_tag$$$$"application",$media:$"all"$%>$
    $$$$$<%=$javascript_include_tag$"application"$%>$
    $$$
    $$$
    $$$$$
    $$$$$$<%=$yield$%>$
    $$$$$
    $$$
    
    Layout

    

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48. Response
    (HTML)*

    !
    !
    Facebook Lite!
    !
    !
    !
    !
    !
    Das Neuste aus dem ganzen Netzwerk!
    !
    !
    !
    Liane19 Nov 20:32!
    Ich bin hier!!!!
    !
    !
    !
    Marco19 Nov 20:02!
    Hallo, ist da wer?!
    !
    !
    !
    Marco19 Nov 19:02!
    Hallo Welt!!
    !
    !
    !
    !
    
    

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49. URL localhost:3000/
    

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50. http://cheezburger.com/
    

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51. Response
    (HTML)
    Browser
    Layout
    View
    Request
    Router
    Controller
    Model
    Database
    

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52. Response
    (HTML)
    Browser
    Layout
    View
    Request
    Router
    Controller
    Model
    Database
    

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53. Response
    (HTML)
    Browser
    Layout
    View
    Request
    Router
    Controller
    Model
    Database
    

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54. Response
    (HTML)
    Browser
    Layout
    View
    Request
    Router
    Controller
    Model
    Database
    

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55. Response
    (HTML)
    Browser
    Layout
    View
    Request
    Router
    Controller
    Model
    Database
    

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56. Response
    (HTML)
    Browser
    Layout
    View
    Request
    Router
    Controller
    Model
    Database
    

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57. Response
    (HTML)
    Browser
    Layout
    View
    Request
    Router
    Controller
    Model
    Database
    

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58. Response
    (HTML)
    Browser
    Layout
    View
    Request
    Router
    Controller
    Model
    Database
    

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59. Response
    (HTML)
    Browser
    Layout
    View
    Request
    Router
    Controller
    Model
    Database
    

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60. Response
    (HTML)
    Browser
    Layout
    View
    Request
    Router
    Controller
    Model
    Database
    

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61. Response
    (HTML)
    Browser
    Layout
    View
    Request
    Router
    Controller
    Model
    Database
    

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62. Response
    (HTML)
    Browser
    Layout
    View
    Request
    Router
    Controller
    Model
    Database
    

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63. All The Tools You Need:
    A Text Editor for writing code and editing files.
    The Terminal (known as Command Prompt)!
    Where you start the rails server and run commands.
    A Web Browser (Firefox, Safari, Chrome,…) 

    for viewing and interacting with your application.
    Ruby, the amazing programming language we love
    Rails, the framework for building web applications
    

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64. Conclusion
    we’ve learned a lot of new stuff
    

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65. http$response$
    generated$data,$HTML,$static$files,$images,…
    http$request$
    get,$post,$put,$delete,…
    

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66. Have fun!!
    Enjoy your workshop!!
    Ask the coaches!
    http://tryruby.org
    Now let’s start coding!
    1
    http://guides.railsgirls.com/app
    2
    

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