Hello, I discovered SQLAlchemy yesterday, and have been trying to figure out if its worth using as I rewrite my clunky code to maintain sql records of parameter values of expensive data structures (large numpy arrays) stored in Python shelves.
It looks fantastic, but not sure yet that it is the right tool. Because I use extensive use of __getattr__ in my classes as currently written, I added the __getattr__ method in this sample code from this tutorial (http://www.sqlalchemy.org/docs/05/ormtutorial.html). ################################################ from sqlalchemy.ext.declarative import declarative_base Base = declarative_base() class User(Base): __tablename__ = 'users' id = Column(Integer, primary_key=True) name = Column(String) fullname = Column(String) password = Column(String) def __init__(self, name, fullname, password): self.name = name self.fullname = fullname self.password = password def __getattr__(self,attr): print "called __getattr__ %s" % attr def __repr__(self): return "<User('%s','%s', '%s')>" % (self.name, self.fullname, self.password) ##################################### I got this error: >>> u = User('jon','jon jon','jj') called __getattr__ _sa_instance_state >>> session.add(u) called __getattr__ _sa_instance_state Traceback (most recent call last): File "<stdin>", line 1, in <module> File ".../SQLAlchemy-0.5.0-py2.5.egg/sqlalchemy/orm/session.py", line 1096, in add self._save_or_update_state(state) File ".../SQLAlchemy-0.5.0-py2.5.egg/sqlalchemy/orm/session.py", line 1105, in _save_or_update_state self._save_or_update_impl(state) File ".../SQLAlchemy-0.5.0-py2.5.egg/sqlalchemy/orm/session.py", line 1264, in _save_or_update_impl if state.key is None: AttributeError: 'NoneType' object has no attribute 'key' >>> then I changed to: def __getattr__(self,attr): print "called __getattr__ %s" % attr Base.__getattr__(attr) and >>> session.add(u) runs without error. I'm definitely in over my head at this point, but I'd like to know if this is a reasonable solution or if I'm going to run problems with SQLAlchemy regarding my reliance on __getattr__ down the road. Any pointers would be much appreciated. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
