fix first for paginated AR Relations

Fixes mislav#223

lib/will_paginate/active_record.rb

@@ -39,6 +39,17 @@ def limit(num)
         end
       end
 
+      # dirty hack to enable `first` after `limit` behavior above
+      def first(*args)
+        if current_page
+          rel = clone
+          rel.current_page = nil
+          rel.first(*args)
+        else
+          super
+        end
+      end
+
       def offset(value = nil)
         if value.nil? then offset_value
         else super(value)

spec/finders/active_record_spec.rb

@@ -92,6 +92,18 @@
       rel.offset.should == 6
     end
 
+    it "supports #first" do
+      rel = Developer.order('id').page(2).per_page(4)
+      rel.first.should == users(:dev_5)
+      rel.first(2).should == users(:dev_5, :dev_6)
+    end
+
+    it "supports #last" do
+      rel = Developer.order('id').page(2).per_page(4)
+      rel.last.should == users(:dev_8)
+      rel.page(3).last.should == users(:poor_jamis)
+    end
+
     it "keeps pagination data after 'scoped'" do
       rel = Developer.page(2).scoped
       rel.per_page.should == 10