Hello,
I have Locality model with 'path' property to get path from 'root' of tree to
current item, everything works ok, but
I can't get result as Locality instance list..
When I use
*'*object_session(self).query(Locality).from_statement(q).order_by(Locality.id)'
I get
sqlalchemy.exc.ArgumentError: from_statement accepts text(), select(), and
union() objects only.
How can I adopt results to Locality model?
class Locality(Base):
__tablename__ = 'localities'
__table_args__ = {'schema': SYSTEM_SCHEMA}
id = Column(Integer, primary_key=True)
parent_id = Column(Integer, ForeignKey(SYSTEM_SCHEMA + '.localities.id'))
name = Column(UnicodeText, nullable=False)
type = Column(Integer, nullable=False)
@property
def path(self):
def get_locality_path_q(locality_id):
top_q = select([
Locality.id,
Locality.parent_id,
Locality.name,
Locality.type,
]).\
where(Locality.id == locality_id).\
cte(recursive=True)
parents = aliased(top_q)
locality_alias = aliased(Locality)
q = top_q.union_all(
select([
locality_alias.id,
locality_alias.parent_id,
locality_alias.name,
locality_alias.type
]).select_from(join(locality_alias, parents, locality_alias.id
== parents.c.parent_id))
)
# return object_session(self).query(q).order_by(q.c.id)
return
object_session(self).query(Locality).from_statement(q).order_by(Locality.id)
return get_locality_path_q(self.id)
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