Rails VUWIT workshop

Me Breccan McLeod-Lundy Developer at 3months Recent projects include: consumer.org.nz, digitalnz.org and sponsafier.com

Ruby(is not rails) Variables i = 3 i * 4 etc

Iterating and blocks i = [1,2] i.each do |one_i| Something End i.each do { |i| something }

Classes class Hello def hi puts “hello” end end

Classes(cont) hello_object = Hello.new hello.hi # hello

If blocks if something stuff elsif something_else Other stuffe else Other other stuff end

Ranges and symbols (1...80) is a range contains everything within it and can be iterated over. Colons start symbols which are minimal bits of data representing only themselves, often used as keys in hashes. :symbol

Rails Started 2004 Included in Mac OS X by default in 2006 Recently: twitter, ravelry etc.

Opinionated Sensible Defaults Don't Repeat Yourself

Generators rails appname script/generate model/controller name script/generate migration migration

Scaffold generation Not really my first choice, but good for demonstrations and prototyping. script/generate scaffold Movie name:string description:text

Migrations Go up and down add_column :table, :name, type remove_column :table, :name

Routes Create restful routes for a controller map.resources :controller_name Make default page the index map.root :controller => 'movies', :action => 'index (may also need to delete index.html in public)

Adding Reviews script/generate scaffold Review rating:integer movie_id:integer content:text In movie model add has_many :reviews In review model add belongs_to :movie

Reviews New method in the controller needs an array of movies to be added to: @movies = Movies.all.collect { |movie| [movie.name, movie.id]} The view needs a select: <%= f.select(:movie, @movies) %>

Partials Major part of reusing code. In a view: <% render :partial => “/reviews/form” %> Create partials with file names like _form.html.erb

Displaying reviews on a film In show method of the movie controller add: @reviews = @movie.reviews (After setting @movie) In the view <% @reviews.each do |review| %> <%= render :partial => “review”, :locals => { :review => review } %> <% end %> Create the partial or even extract it from the default review show!

Other resources Rails Guides Agile web dev with rails book Railscasts Wellrailed google group Google

Breccan McLeod-Lundy www.breccan.com [email_address] breccan on twitter, github etc

Rails VUWIT workshop

by breccan on May 25, 2010

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