diff options
Diffstat (limited to 'actionpack/lib/action_controller/metal/mime_responds.rb')
| -rw-r--r-- | actionpack/lib/action_controller/metal/mime_responds.rb | 134 |
1 files changed, 119 insertions, 15 deletions
diff --git a/actionpack/lib/action_controller/metal/mime_responds.rb b/actionpack/lib/action_controller/metal/mime_responds.rb index 834d44f045..d5e08b7034 100644 --- a/actionpack/lib/action_controller/metal/mime_responds.rb +++ b/actionpack/lib/action_controller/metal/mime_responds.rb @@ -181,6 +181,61 @@ module ActionController #:nodoc: # end # end # + # Formats can have different variants. + # + # The request variant is a specialization of the request format, like <tt>:tablet</tt>, + # <tt>:phone</tt>, or <tt>:desktop</tt>. + # + # We often want to render different html/json/xml templates for phones, + # tablets, and desktop browsers. Variants make it easy. + # + # You can set the variant in a +before_action+: + # + # request.variant = :tablet if request.user_agent =~ /iPad/ + # + # Respond to variants in the action just like you respond to formats: + # + # respond_to do |format| + # format.html do |variant| + # variant.tablet # renders app/views/projects/show.html+tablet.erb + # variant.phone { extra_setup; render ... } + # variant.none { special_setup } # executed only if there is no variant set + # end + # end + # + # Provide separate templates for each format and variant: + # + # app/views/projects/show.html.erb + # app/views/projects/show.html+tablet.erb + # app/views/projects/show.html+phone.erb + # + # When you're not sharing any code within the format, you can simplify defining variants + # using the inline syntax: + # + # respond_to do |format| + # format.js { render "trash" } + # format.html.phone { redirect_to progress_path } + # format.html.none { render "trash" } + # end + # + # Variants also support common `any`/`all` block that formats have. + # + # It works for both inline: + # + # respond_to do |format| + # format.html.any { render text: "any" } + # format.html.phone { render text: "phone" } + # end + # + # and block syntax: + # + # respond_to do |format| + # format.html do |variant| + # variant.any(:tablet, :phablet){ render text: "any" } + # variant.phone { render text: "phone" } + # end + # end + # # Be sure to check the documentation of +respond_with+ and # <tt>ActionController::MimeResponds.respond_to</tt> for more examples. def respond_to(*mimes, &block) @@ -260,7 +315,7 @@ module ActionController #:nodoc: # * for other requests - i.e. data formats such as xml, json, csv etc, if # the resource passed to +respond_with+ responds to <code>to_<format></code>, # the method attempts to render the resource in the requested format - # directly, e.g. for an xml request, the response is equivalent to calling + # directly, e.g. for an xml request, the response is equivalent to calling # <code>render xml: resource</code>. # # === Nested resources @@ -321,11 +376,14 @@ module ActionController #:nodoc: # 2. <tt>:action</tt> - overwrites the default render action used after an # unsuccessful html +post+ request. def respond_with(*resources, &block) - raise "In order to use respond_with, first you need to declare the formats your " \ - "controller responds to in the class level" if self.class.mimes_for_respond_to.empty? + if self.class.mimes_for_respond_to.empty? + raise "In order to use respond_with, first you need to declare the " \ + "formats your controller responds to in the class level." + end if collector = retrieve_collector_from_mimes(&block) options = resources.size == 1 ? {} : resources.extract_options! + options = options.clone options[:default_response] = collector.response (options.delete(:responder) || self.class.responder).call(self, resources, options) end @@ -359,14 +417,12 @@ module ActionController #:nodoc: # is available. def retrieve_collector_from_mimes(mimes=nil, &block) #:nodoc: mimes ||= collect_mimes_from_class_level - collector = Collector.new(mimes) + collector = Collector.new(mimes, request.variant) block.call(collector) if block_given? format = collector.negotiate_format(request) if format - self.content_type ||= format.to_s - lookup_context.formats = [format.to_sym] - lookup_context.rendered_format = lookup_context.formats.first + _process_format(format) collector else raise ActionController::UnknownFormat @@ -397,11 +453,13 @@ module ActionController #:nodoc: # request, with this response then being accessible by calling #response. class Collector include AbstractController::Collector - attr_accessor :order, :format + attr_accessor :format + + def initialize(mimes, variant = nil) + @responses = {} + @variant = variant - def initialize(mimes) - @order, @responses = [], {} - mimes.each { |mime| send(mime) } + mimes.each { |mime| @responses["Mime::#{mime.upcase}".constantize] = nil } end def any(*args, &block) @@ -415,16 +473,62 @@ module ActionController #:nodoc: def custom(mime_type, &block) mime_type = Mime::Type.lookup(mime_type.to_s) unless mime_type.is_a?(Mime::Type) - @order << mime_type - @responses[mime_type] ||= block + @responses[mime_type] ||= if block_given? + block + else + VariantCollector.new(@variant) + end end def response - @responses.fetch(format, @responses[Mime::ALL]) + response = @responses.fetch(format, @responses[Mime::ALL]) + if response.is_a?(VariantCollector) # `format.html.phone` - variant inline syntax + response.variant + elsif response.nil? || response.arity == 0 # `format.html` - just a format, call its block + response + else # `format.html{ |variant| variant.phone }` - variant block syntax + variant_collector = VariantCollector.new(@variant) + response.call(variant_collector) #call format block with variants collector + variant_collector.variant + end end def negotiate_format(request) - @format = request.negotiate_mime(order) + @format = request.negotiate_mime(@responses.keys) + end + + class VariantCollector #:nodoc: + def initialize(variant = nil) + @variant = variant + @variants = {} + end + + def any(*args, &block) + if block_given? + if args.any? && args.none?{ |a| a == @variant } + args.each{ |v| @variants[v] = block } + else + @variants[:any] = block + end + end + end + alias :all :any + + def method_missing(name, *args, &block) + @variants[name] = block if block_given? + end + + def variant + key = if @variant.nil? + :none + elsif @variants.has_key?(@variant) + @variant + else + :any + end + + @variants[key] + end end end end |