SQLAlchemy newbie here.
I'm trying to define a model (subclassed by another model) that represents
a subset of table data of the parent model. Specifically, I want the
subclass to map the most recent row for a given ID.
For example, suppose I have the following model:
class AddressHistory(Base):
__table__ = 'address_table'
date = Column(Date, index=True, nullable=False)
id = Column(BigInteger, primary_key=True)
street = Column(String(2000))
city = Column(String(2000))
state = Column(String(2000))
zip = Column(Integer)
What I want to do is define a subclass of this model which represents the
most recent address record:
class MostRecentAddress(Address):
“””
Represents a row in AddressHistory with the most recent date for a given id.
”””
Is there some sort of subquery I can pass to the mapper_args ? Maybe a
polymorphic_identity?
Or could I create a separate view and have the subclass read from that?
Thanks!
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