All,
I am working on a little bit of code that is using ActiveMapper, and
I encountered a problem. Using the following contrived example:
######################### BEGIN CODE #################################
from sqlalchemy.ext.activemapper import (ActiveMapper, column,
one_to_many, one_to_one,
objectstore)
from sqlalchemy import ForeignKey, String, Integer
import sqlalchemy.ext.activemapper as activemapper
class Person(ActiveMapper):
class mapping:
personIdentifier = column(Integer, primary_key=True)
personName = column(String)
cars = one_to_many('Car',
colname='personIdentifier',
backref='person')
class Dealership(ActiveMapper):
class mapping:
dealershipIdentifier = column(Integer, primary_key=True)
dealershipName = column(String)
class Car(ActiveMapper):
class mapping:
carIdentifier = column(Integer, primary_key=True)
carName = column(String)
personIdentifier = column(Integer,
foreign_key=ForeignKey(
'person.personIdentifier'
)
)
dealershipIdentifier = column(Integer,
foreign_key=ForeignKey(
'dealership.dealershipIdentifier'
)
)
dealership = one_to_one('Dealership',
colname='dealershipIdentifier'
)
########################### END CODE #################################
I am able to produce the following stack trace just by importing the
module (meaning, it happens as a result of the metaclass stuff in
ActiveMapper).
######################## BEGIN TRACE #################################
Traceback (most recent call last):
File "attribute_test.py", line 19, in ?
class Car(ActiveMapper):
File "/lib/sqlalchemy/ext/activemapper.py", line 161, in __init__
process_relationships(cls)
File "/lib/sqlalchemy/ext/activemapper.py", line 99,
process_relationships
class_mapper(klass).add_properties(relations)
File "sqlalchemy/orm/mapper.py", line 310, in add_properties
File "sqlalchemy/orm/mapper.py", line 357, in add_property
File "sqlalchemy/orm/mapper.py", line 966, in init
File "sqlalchemy/orm/properties.py", line 246, in do_init
File "sqlalchemy/orm/properties.py", line 683, in compile
File "sqlalchemy/orm/mapper.py", line 357, in add_property
File "sqlalchemy/orm/mapper.py", line 966, in init
File "sqlalchemy/orm/properties.py", line 243, in do_init
File "sqlalchemy/orm/properties.py", line 347, in _set_class_attribute
File "sqlalchemy/orm/properties.py", line 253, in _register_attribute
File "/lib/sqlalchemy/attributes.py", line 528, in register_attribute
typecallable = getattr(class_, key, None)
TypeError: Error when calling the metaclass bases
getattr(): attribute name must be string
########################## END TRACE #################################
I am able to fix this by just adding the following line to the top of
the register_attribute method in `sqlalchemy/attributes.py`:
if key is None: return
I am not sure why `None` is getting passed into this method as the key
in the first place, but it seems to fix the problem. Is this a safe
change to put into SQLAlchemy proper, or am I just bandaging the
actual problem?
Thanks!
--
Jonathan LaCour
http://cleverdevil.org
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