Index: ambition-0.5.0/lib/ambition/processors/select.rb
===================================================================
--- ambition-0.5.0/lib/ambition/processors/select.rb	(revision 41)
+++ ambition-0.5.0/lib/ambition/processors/select.rb	(working copy)
@@ -35,7 +35,11 @@
         #   [[:call, [:dvar, :m], :name], :upcase]
         elsif args.first.first == :call && args.first[1].last == @receiver
           receiver, method = args
-          translator.chained_call(receiver.last, method)
+          if method == :nil? then
+            process_nil?(receiver.last)
+          else
+            translator.chained_call(receiver.last, method)
+          end
 
         # Deep, chained call:
         #   [[:call, [:call, [:call, [:dvar, :m], :created_at], :something], :else], :perhaps]
@@ -54,6 +58,14 @@
           raise args.inspect
         end
       end
+      
+      def process_nil?(arg)
+        if @negated
+          translator.not_equal(arg, nil)
+        else
+          translator.==(arg, nil)
+        end
+      end
 
       def process_match3(exp)
         right, left = exp