Hi there,
I'm experimenting with a composite primary key to see whether it might
help implement a workflow system, where the primary key consists of an
identifier (code) and a workflow status.
I run into an error with the ORM (in 0.5.5 and trunk) when I modify part
of the primary key (the workflow status). It looks like the session
somehow retains a reference to something that isn't around anymore. The
documentation claims primary keys can be mutated, but perhaps I'm doing
something that really shouldn't be done after all?
I've attached the code to reproduce the issue (reproduce.py). The error
is during the commit on the last line, when the primary keys of two
items are modified.
Here is the traceback:
Traceback (most recent call last):
File "bin/devpython", line 25, in ?
execfile(sys.argv[0])
File "reproduce.py", line 44, in ?
session.commit()
File ".../sqlalchemy/orm/session.py", line 673, in commit
self.transaction.commit()
File ".../sqlalchemy/orm/session.py", line 378, in commit
self._prepare_impl()
File ".../sqlalchemy/orm/session.py", line 362, in _prepare_impl
self.session.flush()
File ".../sqlalchemy/orm/session.py", line 1358, in flush
self._flush(objects)
File ".../sqlalchemy/orm/session.py", line 1445, in _flush
flush_context.finalize_flush_changes()
File ".../sqlalchemy/orm/unitofwork.py", line 288, in
finalize_flush_changes
self.session._register_newly_persistent(elem.state)
File ".../sqlalchemy/orm/session.py", line 1021, in
_register_newly_persistent
self.identity_map.remove(state)
File ".../sqlalchemy/orm/identity.py", line 135, in remove
raise AssertionError("State %s is not present in this identity map"
% state)
AssertionError: State <sqlalchemy.orm.state.InstanceState object at
0xb769ae4c> is not present in this identity map
Regards,
Martijn
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from sqlalchemy import create_engine, MetaData
from sqlalchemy import Table, Column, Integer, Unicode
from sqlalchemy.orm import sessionmaker, mapper
NEW = 0
PUBLISHED = 1
EDITABLE = 2
ARCHIVED = 3
engine = create_engine('sqlite:///:memory:')
metadata = MetaData()
Session = sessionmaker(bind=engine)
session = Session()
user = Table(
'user', metadata,
Column('code', Integer, primary_key=True),
Column('status', Integer, primary_key=True),
Column('username', Unicode, nullable=False),
)
metadata.create_all(engine)
class User(object):
def __init__(self, code, status, username):
self.code = code
self.status = status
self.username = username
mapper(User, user)
a_published = User(0, PUBLISHED, u'a')
session.add(a_published)
session.commit()
a_editable = User(0, EDITABLE, u'a')
session.add(a_editable)
session.commit()
a_published.status = ARCHIVED
a_editable.status = PUBLISHED
session.commit()
