Merb Pluming - The Router

Merb Plumbing The Router

Who am I?

Some simple routes Matching Merb::Router.prepare do match(quot;/signupquot;).to( :controller => quot;usersquot;, :action => quot;newquot; ).name(:signup) end Generating url(:signup) => /signup

Routes with variables Matching match(quot;/articles/:year/:month/:day/:titlequot;).to( :controller => quot;articlesquot;, :action => quot;showquot; ).name(:article) Generating url(:article, :year => 2008, :month => 07, :day => 22, :title => quot;Awesomenessquot;) /articles/2008/07/22/Awesomeness

Routes with conditions Matching match(quot;/articlesquot;) do with(:controller => quot;articlesquot;) do match(quot;/:titlequot;, :title => /[a-z]+/). to(:action => quot;with_titlequot;) match(quot;/:idquot;).to(:action => quot;with_idquot;) end end /articles/Hello_world => with_title /articles/123 => with_id

More conditions Matching Merb::Router.prepare do match(:domain => quot;blogofawesomeness.comquot;) do match(quot;/the-daily-awesomequot;, :method => quot;getquot;). to(:articles) # Any other route... end end

The subdomain problem match(:subdomain => /(.*)/). to(:account => quot;:subdomain[1]quot;) do # application routes here... end

Optional path segments Matching match(quot;/articles(/:year(/:month(/:day)))/:titlequot;). to(:controller => quot;articlesquot;, :action => quot;showquot;). name(:article) Generating /articles/Hello => { :title => “Hello” } /articles/2008/07/Hello => { :year => 2008, :month => “07” :title => “Hello” }

... and generation still works! url(:article, :title => quot;Helloquot;) url(:article, :year => quot;2008quot;, :title => quot;Helloquot;) url(:article, :year => quot;2008quot;, :month => quot;07quot;, :title => quot;Helloquot;) url(:article, :year => quot;2008quot;, :month => quot;07quot;, :day => quot;22quot;, :title => quot;Helloquot;)

Getting Fancy Matching match(quot;(:pref)/:file(.:format)quot;, :pref => quot;.*quot;). to(:controller => quot;cmsquot;).name(:page) /hi => { :file => “hi” } /hi.xml => { :file => “hi”, :format => “xml”} /path/to/hi => { :pref => “/path/to”, :file => “hi }

And you can still generate it url(:page, :file => quot;hiquot;) /hi url(:page, :pref => quot;/path/toquot;, :file => quot;hiquot;) /path/to/hi url(:page, :pref => quot;/helloquot;, :file => quot;worldquot;, :format => quot;mp3quot;) /hello/world.mp3

The default route def default_route(params = {}, &block) match(quot;/:controller(/:action(/:id))(.:format)quot;). to(params, &block).name(:default) end

AWESOME!

Resource routes Matching resources :articles /articles GET => index /articles POST => create /articles/new GET => new /articles/:id GET => show /articles/:id PUT => update /articles/:id DELETE => destroy /articles/:id/edit GET => edit /articles/:id/delete GET => delete

and you can nest them Matching resources :articles do resources :comments end Generating link_to quot;view commentquot;, url(:article_comment, comment.article_id, comment.id)

Nested multiple times resources :articles do resources :comments end resources :songs do resources :comments end resources :photos do resources :comments end

and... generating? link_to quot;view commentquot;, comment.commentable.is_a?(Article) ? url(:article_comment, comment.commentable.id, comment.id) : comment.commentable.is_a?(Song) ? url(:song_comment, comment.commentable.id, comment.id) : url(:photo_comment, comment.commentable.id, comment.id) wha...?

Nah... how about this? link_to quot;view commentquot;, resource(comment.commentable, comment)

Some more examples resources :users do resources :comments end Generating resource(@user) resource(@user, :comments) vs. vs. url(:user, @user) url(:user_comments, @user) resource @user, @comment vs. url(:user_comment, @user, @comment)

Oh yeah... match(quot;/:projectquot;) do resources :tasks end - While currently at /awesome/tasks resource(@task) => /awesome/tasks/123 resource(@task, :project => quot;wootquot;) => /woot/tasks/123

AWESOME!

Friendly URLs Matching resources :users, :identify => :name Generating resource(@user) # => /users/carl

It works as a block too Matching identify(Article=>:permalink, User=>:login) do resources :users do resources :articles end end Generating resource(@user, @article) /users/carl/articles/hello-world

AWESOME!

Redirecting legacy URLs Old: /articles/123-hello-world New: /articles/Hello_world

Handle it in the controller? match(quot;/articles/:idquot;). to(:controller => quot;articlesquot;, :action => quot;showquot;)

Try to do it with Regexps? match(quot;/articles/:idquot;, :id => /^d+-/). to(:controller => quot;articlesquot;, :action => quot;legacyquot;) match(quot;/articles/:urlquot;). to(:controller => quot;articlesquot;, :action => quot;showquot;)

Or, add your own logic! match(quot;/articles/:urlquot;).defer_to do |request, params| if article = Article.first(:url => params[:url]) params.merge(:article => article) elsif article = Article.first(:id => params[:url]) redirect url(:article, article.url) else false end end

Authentication works too match(quot;/secretquot;).defer_to do |request, params| if request.session.authenticated? params end end

Works great for plugins def protect(&block) protection = Proc.new do |request, params| if request.session.authenticated? params else redirect quot;/loginquot; end end defer(protection, &block) end

Awesome! protect.match(quot;/adminquot;) do # ... admin routes here end

Thank you (Awesome!)

Merb Pluming - The Router

by carllerche on Oct 11, 2008

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Merb Pluming - The Router — Presentation Transcript