On Tue, Apr 15, 2014 at 1:11 PM, Pavel Aborilov <[email protected]> wrote:
> but I dont know on the time of query what the type of object it will be.
>
Then you can use session.query(Person).with_polymorphic('*') to mean
joining to the tables of all mapped subclasses. (Be aware that this can
become problematic if there is a lot of them.)
Cheers,
Gulli
>
> On Tuesday, April 15, 2014 5:06:48 PM UTC+4, Gunnlaugur Briem wrote:
>
>> Hi Pavel,
>>
>> You want: s.query(Person).with_polymorphic(Man).get(51)
>>
>> Cheers,
>>
>> Gulli
>>
>>
>> On Tue, Apr 15, 2014 at 12:59 PM, Pavel Aborilov <[email protected]>wrote:
>>
>>> Hello!
>>> How can I cache query like this:
>>> session.query(Person).get(51)
>>>
>>> where 51 is id of Man
>>>
>>> I can't access attribute age of Man without SELECT.
>>>
>>> Models:
>>>
>>> class Person(Base):
>>> __tablename__ = 'person'
>>> id = Column(Integer, primary_key=True)
>>> name = Column(String(100), nullable=False)
>>> type = Column(String(50))
>>> __mapper_args__ = {
>>> 'polymorphic_identity': 'object',
>>> 'polymorphic_on': type
>>> }
>>>
>>> class Man(Person):
>>> __tablename__ = 'man'
>>> id = Column(Integer, ForeignKey('person.id'), primary_key=True)
>>> age = Column(String(100), nullable=False)
>>> __mapper_args__ = {'polymorphic_identity': 'man'}
>>>
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>>
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