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Ruby on rails

Ruby on rails. This ppt contains a pot pourri of information including some sql, some php, some instant rails and so on. Where to get rails. Ruby and rails can be downloaded separately, from a variety of sources, in particular RubyForge.

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Ruby on rails

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  1. Ruby on rails This ppt contains a pot pourri of information including some sql, some php, some instant rails and so on

  2. Where to get rails • Ruby and rails can be downloaded separately, from a variety of sources, in particular RubyForge. • I downloaded ruby to my desktop so I could conveniently develop applications • I downloaded the “Instant Rails” distribution which comes with Ruby, PHP, and MySQL and the Apache server from https://rubyforge.org/projects/instantrails/ • This simply gets unzipped. Use 7-zip rather than winzip. When you run it you get an interface to start/stop apache and mysql servers. • Not detailed here –you may need to install ruby gems – the ruby package manager. It is available from rubyforge.org.. After extraction, run prompt>ruby setup.rb

  3. bookmarks • Among those you may want to mark are tha rails api pages: http://api.rubyonrails.org/ • The Railspace book has a site at http://railsspace.com/book

  4. Instant Rails looks like this:The I in lefthand corner is clicked to open menus

  5. Remarks on rails • Rails is not directly tied to ruby, and rails apps might be developed in other languages, but rails is written in and for ruby. • Rails is a net programming framework, that builds various directories and files common to an MVC architecture. (There are rails+xyz language available.) • You modify and add to these to customize your development. • Text walkthrough seems mostly accurate. I’ve make some screen shots/notes/etc.

  6. Building a rails app • Select rails application/open ruby console from the “I” • This opens a special DOS window from which ruby on rails (instant rails) is manipulated. • Build a dir… I called mine hello. (The text uses dir name exercises.) • Running the app rails from inside this directory will create subdirectories needed for a rails app.

  7. In DOS window C:\InstantRails\rails_apps>mkdir hello C:\InstantRails\rails_apps>dir Volume in drive C has no label. Volume Serial Number is 2C61-5713 Directory of C:\InstantRails\rails_apps 12/24/2007 12:42 PM <DIR> . 12/24/2007 12:42 PM <DIR> .. 12/22/2007 01:37 PM <DIR> .metadata 12/22/2007 01:37 PM <DIR> cookbook 12/24/2007 12:42 PM <DIR> hello 12/22/2007 01:37 PM <DIR> typo-2.6.0 0 File(s) 0 bytes 6 Dir(s) 62,034,526,208 bytes free C:\InstantRails\rails_apps>cd hello

  8. >rails rails1 C:\InstantRails\rails_apps\hello>rails rails1 create create app/controllers create app/helpers create app/models create app/views/layouts create config/environments create components create db create doc create lib create lib/tasks create log create public/images create public/javascripts ….many more here create public/javascripts/prototype.js create public/javascripts/effects.js create public/javascripts/dragdrop.js create public/javascripts/controls.js create public/javascripts/application.js create doc/README_FOR_APP create log/server.log create log/production.log create log/development.log create log/test.log C:\InstantRails\rails_apps\hello>

  9. Create the controller (named “say”) in the rail1 directory C:\InstantRails\rails_apps\hello>cd rails1 C:\InstantRails\rails_apps\hello\rails1>ruby script/generate controller say exists app/controllers/ exists app/helpers/ create app/views/say exists test/functional/ create app/controllers/say_controller.rb create test/functional/say_controller_test.rb create app/helpers/say_helper.rb C:\InstantRails\rails_apps\hello\rails1>

  10. Inheritance notation • X<Y says class X derives from or subclasses Y. • Example in rails: • SayController < ApplicationController

  11. I modified my SayController adding a method message class SayController < ApplicationController def message end end

  12. rhtml • rhtml is a script file with embedded ruby in an html application

  13. rhtml file • Put file in rails1\app\views\say\message <!DOCTYPE html PUBLIC "-//w3c//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <!-- hello.rhtml - the template for Hello World --> <html xmlns = "http://www.w3.org/1999/xhtml"> <head> <title> Hello, Rails! </title> </head> <body> <h1> Hello from Rails! </h1> </body> </html>

  14. Ruby servers • Ruby comes with webrick and mongrel and you can pick which you wish to run. • Use • script/server webrick to force webrick • Default port is 3000

  15. Run mongrel: ruby script/server from rails1 directory

  16. The app running -note mongrel port #

  17. Delivering dynamic content

  18. Delivering dynamic content <!DOCTYPE html PUBLIC "-//w3c//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <!-- hello.rhtml - the template for Hello World --> <html xmlns = "http://www.w3.org/1999/xhtml"> <head> <title> Hello, Rails! </title> </head> <body> <h1> Hello from Rails! </h1> <p> It is now <%= t =Time.now %><br/> number of sec since midnight= <%= t.hour * 3600 +t.min * 60 + t.sec %><br/> </p> </body> </html>

  19. <!DOCTYPE html PUBLIC "-//w3c//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <!-- hello.rhtml - the template for Hello World --> <html xmlns = "http://www.w3.org/1999/xhtml"> <head> <title> Hello, Rails! </title> </head> <body> <h1> Hello from Rails! </h1> <p> It is now <%= @t %><br/> number of sec since midnight= <%= @tsec %><br/> </p> </body> </html> class SayController < ApplicationController def message @t=Time.now @tsec=@t.hour * 3600 + @t.min * 60 + @t.sec end end Text made a new ap but I revised hello/message

  20. Running, it looks about the same

  21. A form example • This is the form example from the text. • Code is all ok although the directory explanation and other details are a bit off. • A directory popcorn is built below rails_apps but another directory needs to be built below this using rails: I called it popcorn1 • See blackscreen shots for details

  22. A form example

  23. A form example

  24. Blackscreen: mongrel server getting parameters

  25. Text off by one directory level • I built popcorn1 under popcorn under rails_apps. • This was my url: http://localhost:3000/home/the_form • I had to run mongrel (at port 3000) • The form is served via mongrel not apache. (stop the apache server and check the url).

  26. Creating the popcorn1 app C:\InstantRails\rails_apps\popcorn>rails popcorn1 create create app/controllers create app/helpers create app/models create app/views/layouts create config/environments create components create db create doc create lib create lib/tasks create log create public/images

  27. Building the controller and running mongrel C:\InstantRails\rails_apps\popcorn>cd popcorn1 C:\InstantRails\rails_apps\popcorn\popcorn1>ruby script/generate controller home exists app/controllers/ exists app/helpers/ create app/views/home exists test/functional/ create app/controllers/home_controller.rb create test/functional/home_controller_test.rb create app/helpers/home_helper.rb C:\InstantRails\rails_apps\popcorn\popcorn1>ruby script/server => Booting Mongrel (use 'script/server webrick' to force WEBrick) => Rails application starting on http://0.0.0.0:3000 => Call with -d to detach • Ctrl-C to shutdown server ** Starting Mongrel listening at 0.0.0.0:3000 ** Starting Rails with development environment... ** Rails loaded. ** Loading any Rails specific GemPlugins ** Signals ready. INT => stop (no restart). ** Mongrel available at 0.0.0.0:3000 ** Use CTRL-C to stop.

  28. Converting a ruby application to a rails application

  29. Summary of steps • Add a directory under rail_apps (I called mine pfix) and change to this directory: Mkdir pfix Cd pfix • Then run rails in this directory to create files and folders using a new subdirectory name, like postfix. • I used the_form.rhtml and result.rhtml files as models for the view. • I used the text’s saycontroller as a model to build my evalcontroller. • Evalcontroller is basically the postfix program. • The stack class needs to be put in this controller directory as well. • I added a variable in the class @the_error and a method errors in the stack class which returns @error, a field value, to the evalcontroller. • The original line, the answer and any error appear in the result form.

  30. After clicking evaluatepostfix button

  31. An expression with errors

  32. Notes • Evalcontroller is in this slide’s notes • Stack class changes left as exercise

  33. The_form for postfix <!DOCTYPE html PUBLIC "-//w3c//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <!-- the_form.rhtml This describes a postfix form page> --> <html xmlns = "http://www.w3.org/1999/xhtml"> <head> <title> Postfix Form </title> </head> <body> <h2> Welcome to postfix evaluator </h2> <!-- The next line gives the address of the CGI program --> <form action = "result" method = "post"> <table> <tr> <td> Enter postfix expression: </td> <td> <input type = "text" name = "expression" size = "70" /> </td> </tr> </table> <p /> <!-- The submit and reset buttons --> <p> <input type = "submit" value = "Evaluate Postfix" /> <input type = "reset" value = "Clear Form" /> </p> </form> </body> </html>

  34. Result.rhtml <!DOCTYPE html PUBLIC "-//w3c//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <!-- result.rhtml - result view for the postfix application --> <html xmlns = "http://www.w3.org/1999/xhtml"> <head> <title> result.rhtml </title> <head> <body> <table> <tr> <td> postfix expression: </td> <td> <%= @line %> </td> </tr> <tr> <td> Evaluated: </td> <td> <%= @answer %> </td> </tr> <tr> <td> any errors: </td> <td> <%= @the_error %> </td> </tr> </table> </body> </html>

  35. On the DOS window where mongrel is running… Processing EvalController#the_form (for 127.0.0.1 at 2007-12-26 18:25:10) [GET] Session ID: a97b5ba4899036b6dc4239629d8909c3 Parameters: {"action"=>"the_form", "controller"=>"eval"} Rendering eval/the_form Completed in 0.00010 (10000 reqs/sec) | Rendering: 0.00000 (0%) | 200 OK [http:/ /localhost/eval/the_form] form] Processing EvalController#result (for 127.0.0.1 at 2007-12-26 18:25:39) [POST] Session ID: a97b5ba4899036b6dc4239629d8909c3 Parameters: {"action"=>"result", "expression"=>"10 10 20 * + 70 /", "controlle r"=>"eval"} Rendering eval/result Completed in 0.00010 (10000 reqs/sec) | Rendering: 0.00000 (0%) | 200 OK [http:/ /localhost/eval/result] esult]

  36. Access to phpMyAdmin • Click the I • Select configure • Select database

  37. phpMyAdmin in instantrails: go to configure/database from I menu

  38. Unrelated to ruby: accessing mysql from php in instantrails distribution of mysql <?php // Make a MySQL Connection mysql_connect("localhost", "root", "") or die(mysql_error()); mysql_select_db("test") or die(mysql_error()); // Retrieve all the data from the "example" table $result = mysql_query("SELECT * FROM Students") or die(mysql_error()); // store the record of the "example" table into $row //$row = mysql_fetch_array( $result ); // Print out the contents of the entry //$result = mysql_query($query) or die(mysql_error()); while($row = mysql_fetch_array($result)){ echo $row['name']. " - ". $row['id']; echo "<br />"; } ?>

  39. Note url…put php files in www directory

  40. RadRails • Radrails is a 43 mb download from SourceForge • It is a rails IDE

  41. Radrails looks like this – I wound up not using this environment

  42. Booting mongrel • C:\InstantRails\rails_apps\RailSpace\rail_space>ruby script/server • => Booting Mongrel (use 'script/server webrick' to force WEBrick) • => Rails application starting on http://0.0.0.0:3000 • => Call with -d to detach • => Ctrl-C to shutdown server • ** Starting Mongrel listening at 0.0.0.0:3000 • ** Starting Rails with development environment... • ** Rails loaded. • ** Loading any Rails specific GemPlugins • ** Signals ready. INT => stop (no restart). • ** Mongrel available at 0.0.0.0:3000 • ** Use CTRL-C to stop.

  43. Mongrel runs at localhost:3000

  44. Generating controller for rail_space • C:\InstantRails\rails_apps\RailSpace\rail_space>ruby script/generate controller • Site index about help • exists app/controllers/ • exists app/helpers/ • create app/views/site • exists test/functional/ • create app/controllers/site_controller.rb • create test/functional/site_controller_test.rb • create app/helpers/site_helper.rb • create app/views/site/index.rhtml • create app/views/site/about.rhtml • create app/views/site/help.rhtml • C:\InstantRails\rails_apps\RailSpace\rail_space>

  45. Site_controller.rb class SiteController < ApplicationController def index end def about end def help end end

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