遇見 Ruby on Rails

May 5, 201029 likes5,698 views

The document introduces Ruby on Rails and provides an overview of its features and benefits. It summarizes the speaker's experience with web development over time, introduces MVC and ORM concepts, and demonstrates Rails through a live coding example. Key advantages of Rails highlighted include its convention over configuration approach, use of Ruby as a dynamic scripting language, and ability to rapidly develop database-backed web applications.

Ruby on Rails
ihower@gmail.com
Ruby Taiwan
2010/5@

Agenda

? Who am I
? My story about web development
? Introduction to Rails
? Rails on Rails live demo
? Why Ruby?

Who am I?

? (a.k.a. ihower)

?
? & ( )

? Ruby on Rails (since 2006)

Web application

Ruby
Java/.NET PHP Python
Perl

CGI, Perl
HTML
#!/usr/bin/perl

open(FILE, "count.txt");
$num = <FILE>; $num++;
close (FILE);

open(WRITETO, ">count.txt");
print WRITETO "$num";
close (WRITETO);

print <<PRINTAREA;
content-type:text/htmlnn
<style>
<!--
body {background-color: black; line-height:1;
margin-top: 0cm;
margin-left: 0cm;
margin-right: 0cm}
--></style>
<body><center>
<b><font size=1 color=white>
$num</font></b>
PRINTAREA

2002~2004

? Dreamweaver

? PHP4
& MySQL

PHP
HTML

<?php
$counter = intval(file_get_contents("counter.dat")) + 1;
$fp = fopen("counter.dat", "w");
fwrite($fp, $counter);
fclose($fp);
?>

<p>Visitors: <?php echo @counter %></p>

$PHP & MySQL <?php $db = mysql_connect("localhost", "root", "password"); mysql_query("SET NAMES 'utf8'"); mysql_select_db($SERVER['db']); ?> <html> <? $sql="select * from news where Class='1' or Class='3' order by CTDate desc limit 0,5"; $result= mysql_query($sql); while ( $arr=mysql_fetch_array($result) ) { echo <<<NEWSEND <div class="box"> <span class="box-title-1"> <b> $arr[Title] </b> $arr[CTDate] </span> <div class="box-content"> $arr[Text] </div> </div> NEWSEND; } ?> </html>$

Web framework?

? MVC
? ORM
? URL Template Session
Ajax ......

MVC
?
Model Controller View
? Model
?
? View
? Ruby HTML

? Controller Model
? (e.g. ) Request Model View (e.g. HTML)

ORM

? Object-relational mapping
?
@posts = Post.find(:all, :order => "id desc", :limit => 5 )
@posts.each do |post|
...
end

Rails?
? ( MIT ) Web
database-backed

? MVC (Model-View-Control )

? ( ) Ruby
Ajax ORM (object-relational-mapping)

? 2004 David Heinemeier Hanson(DHH)
37signals

? Ruby

? Don’t Repeat Yourself (DRY) ?
? Convention Over Con?guration
?
?
?

Ruby on Rails ?
? (

)

? ( Joomla Durpal
CMS

?

Rails
? 2005 DHH Hacker

? 2006 Rails Jolt

? 2005~2006 Ruby/Rails
1552%

? Ruby Tiobe
26 11

Rails ?
Java(Spring/Hibernate) Rails

4 20 4 ( 5 )

3293 1164

1161 113

/ 62/549 55/126

Justin Gehtland Java
Rails

Rails ?

? Justin Gehtland Java :Rails = 3.5 : 1

? Proc.net PHP : Rails = 10 : 1

? JavaEye JAVA : Rails = 10 : 1

? thegiive( Rails ) PHP : Rails = 8 : 1

Rails live demo
Creating a weblog in 15 minutes

Ruby?
?
(interpreted)

?
?
? a.k.a. Matz
? Lisp, Perl, Smalltalk

? Happy

a trivial Ruby example

str = "May Ruby be with you!"
5.times { puts str }

the example tells us:

? (typing)

?
? (code block)

code lines matters
1. more code more bugs
2. more code needs IDE
3. more code needs more time to read

Fred Brooks’ law
“programmer generate about same
amount of code per day regardless
of the language”

? Web framework like Rails has
? MVC
? ORM
? Ruby is
? interpreted scripting language
? dynamic typing language
? object oriented programming

1. Learn more
programming language
Scripting Language: Ruby, Python, JavaScript
Functional Language: Erlang, Scala, Haskell, Clojure

:

http://local.joelonsoftware.com/wiki/The_Joel_on_Software_Translation_Project:

? Ruby Tuesday meeting ( )

? RubyConf Taiwan (2010/4/25)
? OSDC.TW (2010/4/24)
? COSCUP (2010/8/14)
? RubyKaigi (2010/8/27 )

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遇見 Ruby on Rails

1. Ruby on Rails ihower@gmail.com Ruby Taiwan 2010/5@

2. Agenda ? Who am I ? My story about web development ? Introduction to Rails ? Rails on Rails live demo ? Why Ruby?

3. Who am I? ? (a.k.a. ihower) ? ? & ( ) ? Ruby on Rails (since 2006)

4. http://ihower.tw/blog/

5. http://twitter.com/ihower

6. http://ruby.tw

7. Ruby Tuesday Meetings

8. http://rubyconf.tw

9. Where am I?

10. Software Desktop Mobile Web

11. Web application Ruby Java/.NET PHP Python Perl

12. My story about web development

13. 1990 Tim Berners-Lee World Wide Web

14. 1999 ? ? M$ FrontPage ( !) ? CGI

15. 2003 ? Perl CGI ?

16. CGI, Perl HTML #!/usr/bin/perl open(FILE, "count.txt"); $num = <FILE>; $num++; close (FILE); open(WRITETO, ">count.txt"); print WRITETO "$num"; close (WRITETO); print <<PRINTAREA; content-type:text/htmlnn <style> </style> <body><center> <b><font size=1 color=white> $num</font></b> PRINTAREA

17. 2002~2004 ? Dreamweaver ? PHP4 & MySQL

18. PHP HTML <?php $counter = intval(file_get_contents("counter.dat")) + 1; $fp = fopen("counter.dat", "w"); fwrite($fp, $counter); fclose($fp); ?> <p>Visitors: <?php echo @counter %></p>

19. PHP & MySQL <?php $db = mysql_connect("localhost", "root", "password"); mysql_query("SET NAMES 'utf8'"); mysql_select_db($SERVER['db']); ?> <html> <? $sql="select * from news where Class='1' or Class='3' order by CTDate desc limit 0,5"; $result= mysql_query($sql); while ( $arr=mysql_fetch_array($result) ) { echo <<<NEWSEND <div class="box"> <span class="box-title-1"> <b> $arr[Title] </b> $arr[CTDate] </span> <div class="box-content"> $arr[Text] </div> </div> NEWSEND; } ?> </html>

20. 2003 ( )

21. PHP sucks!

22. 2005 ? PHP web framework ?

23. Web framework? ? MVC ? ORM ? URL Template Session Ajax ......

24. MVC ? Model Controller View ? Model ? ? View ? Ruby HTML ? Controller Model ? (e.g. ) Request Model View (e.g. HTML)

25. 1. Controller 2. 3. 4. View Model DB

26. MVC? ? ? (DRY: Don’t repeat yourself) ?

27. ORM ? Object-relational mapping ? @posts = Post.find(:all, :order => "id desc", :limit => 5 ) @posts.each do |post| ... end

28. ORM? ? SQL ? ORM routine SQL ? ? SQL

29. 2006 ? Ruby on Rails ?

30. Rails? ? ( MIT ) Web database-backed ? MVC (Model-View-Control ) ? ( ) Ruby Ajax ORM (object-relational-mapping) ? 2004 David Heinemeier Hanson(DHH) 37signals

31. ? Ruby ? Don’t Repeat Yourself (DRY) ? ? Convention Over Con?guration ? ? ?

32. Ruby on Rails ? ? ( ) ? ( Joomla Durpal CMS ?

33. Rails ? 2005 DHH Hacker ? 2006 Rails Jolt ? 2005~2006 Ruby/Rails 1552% ? Ruby Tiobe 26 11

34. Rails ? Java(Spring/Hibernate) Rails 4 20 4 ( 5 ) 3293 1164 1161 113 / 62/549 55/126 Justin Gehtland Java Rails

35. Rails ? ? Justin Gehtland Java :Rails = 3.5 : 1 ? Proc.net PHP : Rails = 10 : 1 ? JavaEye JAVA : Rails = 10 : 1 ? thegiive( Rails ) PHP : Rails = 8 : 1

36. Rails clone

37. Rails ? M V C MVC Model-View-Control

38. Rails live demo Creating a weblog in 15 minutes

39. User stories ? ? ? ?

40. Why Ruby?

41. Ruby? ? (interpreted) ? ? ? a.k.a. Matz ? Lisp, Perl, Smalltalk ? Happy

42. a trivial Ruby example str = "May Ruby be with you!" 5.times { puts str }

43. the example tells us: ? (typing) ? ? (code block)

44. code lines matters 1. more code more bugs 2. more code needs IDE 3. more code needs more time to read

45. Fred Brooks’ law “programmer generate about same amount of code per day regardless of the language”

46. ? Web framework like Rails has ? MVC ? ORM ? Ruby is ? interpreted scripting language ? dynamic typing language ? object oriented programming

47. Rails Ruby http://ihower.tw/training

48. One more thing...

49. If I were a college student...

50. 1. Learn more programming language Scripting Language: Ruby, Python, JavaScript Functional Language: Erlang, Scala, Haskell, Clojure

51. 2. Master Unix command Line

54. 3. Use Mac or Ubuntu Windows Unix-like

57. 4. Learn Git or Hg :

59. Live demo ( )

60. 5. Learn OOP

62. 6. Be Agile ?

63. http://ihower.tw/blog/archives/1750

64. : http://local.joelonsoftware.com/wiki/The_Joel_on_Software_Translation_Project:

65. 7. Learn SQL

67. 8. Learn HTTP

69. 9. Conference & Meetings

70. ? Ruby Tuesday meeting ( ) ? RubyConf Taiwan (2010/4/25) ? OSDC.TW (2010/4/24) ? COSCUP (2010/8/14) ? RubyKaigi (2010/8/27 )

71. ihower http://ihower.tw/blog/books