All the documentation I've found (pylons web site, examples, etc) tell
the developer to put all this business logic in the controller and
just setup a flimsy old model with the "pass" keyword. I myself did
the same when first learning pylons. As my app grew, so did my needs.
I'm trying encapulate all data stuff in the model. For example, I
have a Book object so it would have methods like get, get_all, recent,
etc. Those all work fine, but the problem occurs when trying to
create a new Book object.
/models/book.py:
class Book(object):
def get_all(self):
query = meta.Session.query(Book).filter_by(user_id=1)
return query.all()
def save(self):
meta.Session.save_or_update(self)
meta.Session.commit()
/models/__init__.py:
def init_model(engine):
"""
Setup the model.
This gets called by lib.app_globals
"""
print "Initializing model..."
sm = orm.sessionmaker(autoflush=True, transactional=True,
bind=engine)
meta.engine = engine
meta.Session = orm.scoped_session(sm)
Here, my get_all() method works like a charm. BUT the save() method
gives me this error:
sqlalchemy.exceptions.InvalidRequestError: Class 'type' entity name
'None' has no mapper associated with it
I can see that maybe the model can't save itself and instead the
session should be saving it. But how do I go about doing that using
this modular structure?
(the suggestion here didn't work for me:
http://groups.google.com/group/pylons-discuss/browse_thread/thread/6ff8f5365414da73/bf384c1d96ea87bd?lnk=gst&q=session+save+in+model+class#bf384c1d96ea87bd)
[I am running Pylons 0.9.7 with SQLAlchemy 0.4.4]
Thanks!
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