http://www.dizzy.co.uk/ Tutorials, cheatsheets, tips and more for the RoR framework. en-gb Comprehensive but concise details of Rails' built-in class validation helper methods from validates_acceptance_of through to validates_uniqueness_of, along with details of how to roll your own low-level validations along with examples... mr_dizzy http://dizzy.co.uk/ruby_on_rails/contents/active-record-validations Each ActiveRecord backed model in Rails has an errors object which errors are added to if the model fails validation. This cheatsheet covers methods available, default errors messages and view error helpers. mr_dizzy http://dizzy.co.uk/ruby_on_rails/contents/active-record-validation-errors Up and down methods, rake tasks, column mapping, loading fixtures, example migration file, all packed onto one A4 page for an easy at-a-glance reference. Updated for Rails 2.1 mr_dizzy http://dizzy.co.uk/ruby_on_rails/contents/rails-migrations If you want an easy way to use visual effects on your page or to manipulate the DOM in an AJAX style way but without making a call to the server, then take a look at this helper method... mr_dizzy http://dizzy.co.uk/ruby_on_rails/contents/using-rjs-without-calling-the-server Create forms, check boxes, radio buttons, select lists and more using Rails' built-in form helpers. mr_dizzy http://dizzy.co.uk/ruby_on_rails/contents/form-helpers I have completely rewritten the form helpers cheatsheet to make it much more useful. mr_dizzy http://dizzy.co.uk/ruby_on_rails/contents/rewritten-form-helpers-cheatsheet ActionMailer is the Rails framework which handles email delivery. This comprehensive cheatsheet will help your email on its way. mr_dizzy http://dizzy.co.uk/ruby_on_rails/contents/action-mailer Regular expressions can be one of the trickiest aspects of programming to manage. This little tool will help you test out your code quickly and easily... mr_dizzy http://dizzy.co.uk/ruby_on_rails/contents/test-your-regular-expressions-online Sometimes you want to quickly see the output of helper methods, and constantly clicking refresh in your browser then viewing the page source can be tiresome. Instead, use the Rails console to check helpers are doing what you want them to. mr_dizzy http://dizzy.co.uk/ruby_on_rails/contents/debugging-form-helpers-with-the-console We show you how to create a HABTM association for a table that links back to itself. For example, an article that has many related articles, or a person who has many related people. mr_dizzy http://dizzy.co.uk/ruby_on_rails/contents/self-referential-table-joins A look at the new features and syntax available in migrations on Rails 2.0 mr_dizzy http://dizzy.co.uk/ruby_on_rails/contents/rails-2-sexy-migrations A brilliant plugin that makes changing your database schema even easier and faster. mr_dizzy http://dizzy.co.uk/ruby_on_rails/contents/auto-migrations Learn how to upload files to the database, then retrieve and display them mr_dizzy http://dizzy.co.uk/ruby_on_rails/contents/store-file-uploads-in-database