Formula for determining Transient, Pending, Persistent, Detached

[Kent]

Please correct me if I'm mistaken and let me know if there is a better
way:

if attributes.instance_state(instance).has_identity:
instance is Persistent or Detached

if attributes.instance_state(instance).session_id:
instance is Pending or Persistent


Thanks,
Kent

[Kent]

I suppose "attributes.instance_state(instance).session_id is not None"
is more correct than "attributes.instance_state(instance).session_id"

[Michael Bayer]

from sqlalchemy.orm import object_session
from sqlalchemy.orm.util import has_identity

transient:

object_session(obj) is None and not has_identity(obj)

detached:

object_session(obj) is None and has_identity(obj)

pending, persistent etc.

You've basically figured out the less public ways of doing the same thing.