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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, gems, 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, gems, 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 the apache and mysql servers. • Not detailed here –you may separately 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. Alternatively • For windows, download Ruby (windows installer) at RubyForge.org • Install RubyGems (a zip file at RubyForge) • After extraction, run prompt>ruby setup.rb • Install Rails from the commandline prompt>gem install rails –include dependencies

  6. Remarks on rails • Rails is written in and for ruby. • Rails is a net programming framework, that builds various directories and files common to an MVC architecture. • You modify and add to these to customize your development. • Text walkthrough seems mostly accurate. I’ve make some screen shots/notes/etc.

  7. mvc

  8. A convention • For a site named MySite, the project would be created with lowercase and underscore, as my_site. • You build a subdirectory below rails_apps and run rails from there.

  9. Directories: where do things go? • app: views, models, helpers, controllers • test: unit, integration,functional, fixtures • public: stylesheets, javascripts, images • lib: tasks • db: migrate • config: environments

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

  11. Mongrel at port 3000

  12. Converting a ruby application to a rails application

  13. 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 for the view. • 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.

  14. After clicking evaluate postfix button

  15. An expression with errors

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

  17. 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>

  18. 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>

  19. 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]

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

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

  22. 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 />"; } ?>

  23. Note url…put php files in www directory

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

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

  26. 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>

  27. Site files • Note the app/views/site (index, about, help) rhtml files are generated automatically and correspond to (next slide) methods of site controller

  28. Site_Controller.rb class SiteController < ApplicationController def index end def about end def help end end

  29. A login generator • Some notes for a prewritten login generator for rails are at • http://wiki.rubyonrails.org/rails/pages/LoginGenerator

  30. Notes on setting up login • Edit app/controllers/application.rb require 'login_system' class ApplicationController < ActionController::Base include LoginSystem model :user end • Edit app/controllers/account_controller.rb to set who if anyone can delete users. Until they have admin roles, most people can set it so only account holders can delete their account:def delete if params['id'] && @session['user'] && @session['user'].id == params['id'] • Edit your own controllers now, and add the linebefore_filter :login_required to the inside of the class so that it ends up looking something like this:class AllMySecretsController < ApplicationController before_filter :login_required def show_one_secret ... end end • Of course, I sometimes don’t want every method hidden behind the iron curtain, so I can exclude some of them (such as show_one_secret above) from being protected like so:class AllMySecretsController < ApplicationController before_filter :login_ required, :except => [ :show_one_secret ] def show_one_secret ... end end

  31. Installing some gems – just the last is needed for this login generator C:\InstantRails\ruby>gem install --source http://gems.rubyforge.org localization _generator Bulk updating Gem source index for: http://gems.rubyforge.org Successfully installed rake-0.8.1 Successfully installed localization_generator-1.0.8 2 gems installed Installing ri documentation for rake-0.8.1... Installing RDoc documentation for rake-0.8.1... C:\InstantRails\ruby>gem install --source http://gems.rubyforge.org salted_login _generator Successfully installed salted_login_generator-2.0.2 1 gem installed C:\InstantRails\ruby>gem install --source http://gems.rubyforge.org login_genera tor Successfully installed login_generator-1.2.2 1 gem installed C:\InstantRails\ruby>

  32. The login generator C:\InstantRails\rails_apps>mkdir loginapp C:\InstantRails\rails_apps>cd loginapp C:\InstantRails\rails_apps\loginapp>rails MyLogin create create app/controllers create app/helpers create app/models create app/views/layouts … C:\InstantRails\rails_apps\loginapp\MyLogin>gem install login_generator Bulk updating Gem source index for: http://gems.rubyforge.org Successfully installed login_generator-1.2.2 C:\InstantRails\rails_apps\loginapp\MyLogin>ruby script/generate login Acco create lib/login_system.rb create app/controllers/account_controller.rb create test/functional/account_controller_test.rb create app/helpers/account_helper.rb create app/models/user.rb create test/unit/user_test.rb create test/fixtures/users.yml create app/views/layouts/scaffold.rhtml create public/stylesheets/scaffold.css create app/views/account create app/views/account/welcome.rhtml create app/views/account/login.rhtml create app/views/account/logout.rhtml create app/views/account/signup.rhtml create README_LOGIN C:\InstantRails\rails_apps\loginapp\MyLogin>

  33. Be sure to create the correct database for this app • Rails uses test, production and development databases for each app. • Here use the database mylogin_development • Create the table users (see next slide) • replace mylogin by your app name

  34. Create a user table in mysql • here’s a script you can run in phpmyadmin: CREATE TABLE users ( id int(11) NOT NULL auto_increment, login varchar(80) default NULL, password varchar(40) default NULL, PRIMARY KEY (id) );

  35. Running this app

  36. MrEd with pw horse

  37. Then you get this (there’s some work to do still to arrange redirection)

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