Re: [Sqlalchemy-tickets] [sqlalchemy] #2734: __eq__ operator appears to not be working correctly for decorated types

[sqlalchemy <mi...@zz...>]

#2734: __eq__ operator appears to not be working correctly for decorated types
-----------------------------------+------------------------------------
      Reporter:  mcclurem          |      Owner:  zzzeek
          Type:  defect            |     Status:  closed
      Priority:  medium            |  Milestone:
     Component:  declarative       |   Severity:  no triage selected yet
    Resolution:  worksforme        |   Keywords:  TypeDecorator
Progress State:  completed/closed  |
-----------------------------------+------------------------------------

Comment (by zzzeek):

 the patch in #2744 allows this workaround to be performed more simply:

 {{{
 #!python
 class NullableString(TypeDecorator):
     '''Turns None into the string "Null" and back in order to prevent
 Null!=Null issues'''

     impl = String

     coerce_to_is_types = ()

     def process_bind_param(self, value, dialect):
         return "NONE" if value is None else value

     def process_result_value(self, value, dialect):
         return None if value == "NONE" else value
 }}}

--
Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2734#comment:4>
sqlalchemy <http://www.sqlalchemy.org/>
The Database Toolkit for Python