Extract GraphCollection#parse_page_url to a class method.

To make it easier for non-Rails apps to use the GraphCollection's paging support, parse_page_url can now be used without having to instantiate a GraphCollection object.  (Useful for passing the whole previous/next URLs as parameters in environments lacking url_for.)

lib/koala/graph_api.rb

@@ -205,6 +205,7 @@ def get_comments_for_urls(urls = [], args = {}, options = {})
         args.merge!(:ids => urls.respond_to?(:join) ? urls.join(",") : urls)
         get_object("comments", args, options)
       end
+
       def set_app_restrictions(app_id, restrictions_hash, args = {}, options = {})
         graph_call(app_id, args.merge(:restrictions => MultiJson.encode(restrictions_hash)), "post", options)
       end

lib/koala/graph_collection.rb

@@ -41,8 +41,12 @@ def initialize(response, api)
           parse_page_url(@paging[this])
         end
       end
-
+      
       def parse_page_url(url)
+        GraphCollection.parse_page_url(url)
+      end
+
+      def self.parse_page_url(url)
         match = url.match(/.com\/(.*)\?(.*)/)
         base = match[1]
         args = match[2]

spec/cases/graph_collection_spec.rb

@@ -74,14 +74,30 @@
   end
 
   describe "when parsing page paramters" do
-    it "should return the base as the first array entry" do
-      base = "url_path"
-      @collection.parse_page_url("anything.com/#{base}?anything").first.should == base
+    describe "#parse_page_url" do
+      it "should pass the url to the class method" do
+        url = stub("url")
+        Koala::Facebook::GraphCollection.should_receive(:parse_page_url).with(url)
+        @collection.parse_page_url(url)
+      end
+
+      it "should return the result of the class method" do
+        parsed_content = stub("parsed_content")
+        Koala::Facebook::GraphCollection.stub(:parse_page_url).and_return(parsed_content)
+        @collection.parse_page_url(stub("url")).should == parsed_content
+      end
     end
+
+    describe ".parse_page_url" do    
+      it "should return the base as the first array entry" do
+        base = "url_path"
+        Koala::Facebook::GraphCollection.parse_page_url("anything.com/#{base}?anything").first.should == base
+      end
 
-    it "should return the arguments as a hash as the last array entry" do
-      args_hash = {"one" => "val_one", "two" => "val_two"}
-      @collection.parse_page_url("anything.com/anything?#{args_hash.map {|k,v| "#{k}=#{v}" }.join("&")}").last.should == args_hash
+      it "should return the arguments as a hash as the last array entry" do
+        args_hash = {"one" => "val_one", "two" => "val_two"}
+        Koala::Facebook::GraphCollection.parse_page_url("anything.com/anything?#{args_hash.map {|k,v| "#{k}=#{v}" }.join("&")}").last.should == args_hash
+      end
     end
   end