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Viridians on Rails
- 1. on Why Rails? How Rails? Please find latest version of the presentation at http://viridian.in/academic_platform
- 7. LEARNING TO LEARN RAILS YOURSELF Rails is based on conventions. To start, you need to know the basics. But from then on, learning rails is all about self-experimenting, Googling and discovering new conventions / plugins / gems / open source APIs which solve or simplify your problems.
- 9. Rails project Note: Gem is the ruby equivalent of Java jar. Plugin is nothing but an unpacked jar file. Gem code cannot be changed but plugin code can be changed.
- 10. Is my env. working fine? *Note: 127.0.0.1 is localhost by default in Windows
- 11. Getting started… Types of methods for Models: - Virtual Attributes - Static Methods
- 12. Rails Magic in MVC terms (Gem) (Gem) (Gem)
- 17. Ritvvij Parrikh http://viridian.in [email_address] http://groups.google.com/group/viridian_in Thank You! Create a Viridians account at http://my.viridian.in
Editor's Notes
- Ramesh - Vista
- Start -> Run -> cmd > cd C: ubyonrails > use_ruby > cd C: ubyonrails ails_apps > rails project_name -d mysql <<project_name>>/ ..../app ......../controller -> A controller handles a web request from the user. ......../helpers -> Functions which help GUI mainly. ......../models -> Each file corresponds to a table in database. ......../views ............../layouts -> template of view files. ............../<controller_name> -> folder corresponding to each controller. ................../viewfiles.html.erb -> Run it through ruby interpreteur and generate html file. A view file corresponding to each function in a controller. ..../config ......../environments -> Holds 3 configuration files one each for production, test and development env. ......../initializers -> Constants. ......../environment file -> General configuration. ......../database.yml file -> Database connection configuration per environment (prod, test, dev). ......../routes file -> Routing of incoming web requests to appropriate code. ..../db ......../migrate -> Holds migration files to creata tables, upload data, upload test data, etc. (like SQL scripts) ......../seed ............../always -> yml files for reference data. ............../before_others -> Holds yml files needed to be run always first. ......../schema.rb -> Holds database table structures. Rails automatically creates it. Never manually change it. ......../seeds.rb -> ignore. ..../doc -> RubyDocs. Ignore not important ..../lib -> ignore ..../log -> ignore ..../public ......../images -> Holds pictures that are to be shown on website. ......../javascript -> Javascript. ......../stylesheets -> CSS. ..../private -> Does not come with rails but at Viridians we add this folder to store user images and files. The public folder is exposed and hence a security risk. ..../script -> Scripts to create, manage and launch various rails services. ..../test -> ignore ..../tmp -> ignore ..../vendor ......../plugins -> 3rd party Plugins used by the project. ......../gems -> Holds 3rd party gems which have been frozen. README-> ignore Rakefile-> ignore
- Start MYSQL Server > cd project_name > ruby script/server => Booting Mongrel => Rails 2.3.2 application starting on http://0.0.0.0:3000 => Call with -d to detach => Ctrl-C to shutdown server Go to browser and type http://localhost:3000/
- > ruby scriptgenerate scaffold contact name:string weblink:string email:string password:string -> Creates contacts_controller with new, create, edit, update, delete, show, index methods. Contacts model and contacts view folder with new, edit, show, index view files. Links accessible are http://website.com/contacts/new http://website.com/contacts/edit/1 http://website.com/contacts/show/1 http://website.com/contacts/index > ruby scriptgenerate controller password -> Rails promotes creating restful design. Now considering, we need to create 3 functions, edit_password, forgot_password, create_random_password. Instead of adding them to contacts controller, create a dummy controller called passwords and dump these functions in the passwords controller. > ruby scriptgenerate model page name:string header_str:string -> Creates a model file alone / table. rake db:drop -> Drop database schema rake db:create -> Add database schema rake db:migrate RAILS_ENV=production VERSION=<<>> -> Create tables and upload datavalues based on db/migrations files > ruby script/server => Booting Mongrel => Rails 2.3.2 application starting on http://0.0.0.0:3000 => Call with -d to detach => Ctrl-C to shutdown server
- rake db:drop -> Drop database schema rake db:create -> Add database schema rake db:migrate RAILS_ENV=production VERSION=<<>> -> Create tables and upload datavalues based on db/migrations files > ruby script/server => Booting Mongrel => Rails 2.3.2 application starting on http://0.0.0.0:3000 => Call with -d to detach => Ctrl-C to shutdown server
- Sessions in Rails Sessions configuration at …configinitializerssession_store.rb ActionController::Base.session = { :key => '_blabla', :secret => ‘….‘} ActionController::Base.session_store = :active_record_store Store session in DB at …dbmigratecreate_tables.rb sessions table Some functions at …appcontrollersapplication_controller.rb current_user_session, current_user, require_user, require_no_user Methods in Models User Model Virtual attributes on object def name return first_name + last_name end Static Methods def self.randomize_username …. End Database queries User.find_by_first_name(‘Vikram’) User.all(:conditions => {:first_name => ‘Vikram’, :last_name => ‘Aditya’}, :order => “created_at DESC”) User.first(:conditions => {:first_name => ‘Vikram’})