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# 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(:tag_uri => "2008") 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>:schema_date</tt>: Required. The date at which the tag scheme for the feed was first used. A good default is the year you created the feed. See http://feedvalidator.org/docs/error/InvalidTAG.html for more information.
# * <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)
if options[:schema_date].blank?
logger.warn("You must provide the :schema_date option to atom_feed for your feed to be valid. A good default is the year you first created this feed.") unless logger.nil?
else
options[:schema_date] = options[:schema_date].strftime("%Y-%m-%d") if options[:schema_date].respond_to?(:strftime)
end
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},#{options[:schema_date]}:#{request.request_uri.split(".")[0]}")
xml.link(:rel => 'alternate', :type => 'text/html', :href => options[:root_url] || (request.protocol + request.host_with_port))
xml.link(:rel => 'self', :type => 'application/atom+xml', :href => options[:url] || request.url)
yield AtomFeedBuilder.new(xml, self, options)
end
end
class AtomFeedBuilder
def initialize(xml, view, feed_options = {})
@xml, @view, @feed_options = xml, view, feed_options
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},#{@feed_options[:schema_date]}:#{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, &block)
@xml.__send__(method, *arguments, &block)
end
end
end
end
end
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