Base class A1 contains polymorphic_identity (along with polymorphic_on),
but Query(A1)doesn't produce where clause, whereas Query(A2) (where A2 is
subclass of A1 with its own polymorphic_identity) does.
Tried looking in docs with no success. I think I am just missing something.
from sqlalchemy import Column, Integer, Stringfrom sqlalchemy.ext.declarative
import declarative_basefrom sqlalchemy.orm import Query, configure_mappers
Base = declarative_base()
class A1(Base):
__tablename__ = 'a1'
id = Column(Integer, primary_key=True)
poly_on = Column(String, nullable=False)
__mapper_args__ = {
'polymorphic_on': poly_on,
'polymorphic_identity': 'a1',
}
class A2(A1):
__mapper_args__ = {
'polymorphic_identity': 'a2',
}
configure_mappers()
print(Query(A1))# SELECT a1.id AS a1_id, a1.poly_on AS a1_poly_on# FROM a1
print(Query(A2))# SELECT a1.id AS a1_id, a1.poly_on AS a1_poly_on# FROM a1#
WHERE a1.poly_on IN (:poly_on_1)
I would expect WHERE clauses in both cases.
Originally posted here <https://stackoverflow.com/q/56701668/3151829>.
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