On 10/23/2016 03:46 PM, Ergo wrote:
Hi,
I'm trying to use get() with composite primary key like this:
class GroupPermissionService(BaseService):
@classmethod
def get(cls, group_id, perm_name, db_session=None):
db_session = get_db_session(db_session)
return db_session.query(cls.model).get([group_id, perm_name])
I'm using Python 3.5.1 with SQLAlchemy==1.0.12,
It seems that my tests fail on random when .get() returned nothing, I've
added print(cls.model.__mapper__.primary_key) to the body of my function
to see the order of primary keys and it appears that
the order can change between the runs, this is the output of print:
(Column('perm_name', Unicode(length=64), table=<groups_permissions>,
primary_key=True, nullable=False), Column('group_id', Integer(),
ForeignKey('groups.id'), table=<groups_permissions>, primary_key=True,
nullable=False))
(Column('group_id', Integer(), ForeignKey('groups.id'),
table=<groups_permissions>, primary_key=True, nullable=False),
Column('perm_name', Unicode(length=64), table=<groups_permissions>,
primary_key=True, nullable=False))
So my question is: is this a bug or am I trying to use this incorrectly
and I should somehow determine the order when application is loaded?
I would assume the order of keys should be deterministic in this scenario.
you likely have some mixins or something producing your primary key and
not coming out in the same order on each run of the interpreter. Add a
PrimaryKeyConstraint to your declared class that establishes the desired
column ordering.
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