PostgreSQL: fix quote_string for certain old pg drivers. [rails#94 state:resolved]

Author: larskanis

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -346,7 +346,7 @@ def quote_string(s) #:nodoc:
           # There are some incorrectly compiled postgres drivers out there
           # that don't define PGconn.escape.
           self.class.instance_eval do
-            undef_method(:quote_string)
+            remove_method(:quote_string)
           end
         end
         quote_string(s)