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Diffstat (limited to 'actionpack/lib/action_view/helpers/atom_feed_helper.rb')
| -rw-r--r-- | actionpack/lib/action_view/helpers/atom_feed_helper.rb | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/actionpack/lib/action_view/helpers/atom_feed_helper.rb b/actionpack/lib/action_view/helpers/atom_feed_helper.rb new file mode 100644 index 0000000000..c3ceecbf54 --- /dev/null +++ b/actionpack/lib/action_view/helpers/atom_feed_helper.rb @@ -0,0 +1,111 @@ +# Adds easy defaults to writing Atom feeds with the Builder template engine (this does not work on ERb or any other +# template languages). +module ActionView + module Helpers #:nodoc: + module AtomFeedHelper + # Full usage example: + # + # config/routes.rb: + # ActionController::Routing::Routes.draw do |map| + # map.resources :posts + # map.root :controller => "posts" + # end + # + # app/controllers/posts_controller.rb: + # class PostsController < ApplicationController::Base + # # GET /posts.html + # # GET /posts.atom + # def index + # @posts = Post.find(:all) + # + # respond_to do |format| + # format.html + # format.atom + # end + # end + # end + # + # app/views/posts/index.atom.builder: + # atom_feed do |feed| + # feed.title("My great blog!") + # feed.updated((@posts.first.created_at)) + # + # for post in @posts + # feed.entry(post) do |entry| + # entry.title(post.title) + # entry.content(post.body, :type => 'html') + # + # entry.author do |author| + # author.name("DHH") + # end + # end + # end + # end + # + # The options are for atom_feed are: + # + # * <tt>:language</tt>: Defaults to "en-US". + # * <tt>:root_url</tt>: The HTML alternative that this feed is doubling for. Defaults to / on the current host. + # * <tt>:url</tt>: The URL for this feed. Defaults to the current URL. + # + # atom_feed yields a AtomFeedBuilder instance. + def atom_feed(options = {}, &block) + xml = options[:xml] || eval("xml", block.binding) + xml.instruct! + + xml.feed "xml:lang" => options[:language] || "en-US", "xmlns" => 'http://www.w3.org/2005/Atom' do + xml.id("tag:#{request.host}:#{request.request_uri.split(".")[0].gsub("/", "")}") + xml.link(:rel => 'alternate', :type => 'text/html', :href => options[:root_url] || (request.protocol + request.host_with_port)) + + if options[:url] + xml.link(:rel => 'self', :type => 'application/atom+xml', :href => options[:url] || request.url) + end + + yield AtomFeedBuilder.new(xml, self) + end + end + + + class AtomFeedBuilder + def initialize(xml, view) + @xml, @view = xml, view + end + + # Accepts a Date or Time object and inserts it in the proper format. If nil is passed, current time in UTC is used. + def updated(date_or_time = nil) + @xml.updated((date_or_time || Time.now.utc).xmlschema) + end + + # Creates an entry tag for a specific record and prefills the id using class and id. + # + # Options: + # + # * <tt>:updated</tt>: Time of update. Defaults to the created_at attribute on the record if one such exists. + # * <tt>:published</tt>: Time first published. Defaults to the updated_at attribute on the record if one such exists. + # * <tt>:url</tt>: The URL for this entry. Defaults to the polymorphic_url for the record. + def entry(record, options = {}) + @xml.entry do + @xml.id("tag:#{@view.request.host_with_port}:#{record.class}#{record.id}") + + if options[:published] || (record.respond_to?(:created_at) && record.created_at) + @xml.published((options[:published] || record.created_at).xmlschema) + end + + if options[:updated] || (record.respond_to?(:updated_at) && record.updated_at) + @xml.updated((options[:updated] || record.updated_at).xmlschema) + end + + @xml.link(:rel => 'alternate', :type => 'text/html', :href => options[:url] || @view.polymorphic_url(record)) + + yield @xml + end + end + + private + def method_missing(method, *arguments) + @xml.__send__(method, *arguments) + end + end + end + end +end
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