Added call to db.count to example. Need to see why it's not working.

examples/demo.rb

@@ -13,4 +13,8 @@ coll.insert(doc)
 doc = {'a' => 2}
 coll.insert(doc)
 
+doc = {'a' => 3}
+coll.insert(doc)
+
+puts coll.count()
 coll.find().each { |doc| puts doc.inspect }

lib/mongo/db.rb

@@ -112,7 +112,7 @@ module XGen
           doc = db_command(:count => collection, :query => selector)
           o = doc['ok']
           return doc['n'].to_i if o.to_i == 1
-          raise "Error with count command: #{doc.to_s}" unless o.kind_of?(Numeric)
+          raise "Error with count command: #{doc.inspect}"
         end
 
         def drop_index(collection, name)