[sqlalchemy] is it two or more levels of polymorphism possible?
hi all,
i was wondering if there's a way to create more than one level of
polymorphic entities in sa. quick example:
class Foo(Base):
...
__mapper_args__ = { ... }
class Bar(Foo):
...
__mapper_args__ = { ??? } # --- polymorphic_identity for ... two?
class Baz(Bar): # --- is this possible?
...
cheers,
Richard.
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Re: [sqlalchemy] is it two or more levels of polymorphism possible?
On 7/15/15 9:09 AM, Richard Gerd Kuesters wrote:
hi all,
i was wondering if there's a way to create more than one level of
polymorphic entities in sa. quick example:
class Foo(Base):
...
__mapper_args__ = { ... }
class Bar(Foo):
...
__mapper_args__ = { ??? } # --- polymorphic_identity for ...
two?
class Baz(Bar): # --- is this possible?
...
yes, you give a new polymorphic_identity to Baz separate from Bar.
The only requirement is that they are all using the same column on Foo
for the differentiation (cascading polymorphic_on columns isn't
supported yet).
cheers,
Richard.
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Re: [sqlalchemy] is it two or more levels of polymorphism possible?
oh, yes, i was thinking about cascading polymorphic_on, like you mentioned.
but, no problem, i'll try to workaround my problem with a more simple
approach (the old soft-delete dilemma) ...
thanks for your help, Mike!
best regards,
richard.
On 07/15/2015 10:46 AM, Mike Bayer wrote:
On 7/15/15 9:09 AM, Richard Gerd Kuesters wrote:
hi all,
i was wondering if there's a way to create more than one level of
polymorphic entities in sa. quick example:
class Foo(Base):
...
__mapper_args__ = { ... }
class Bar(Foo):
...
__mapper_args__ = { ??? } # --- polymorphic_identity for
... two?
class Baz(Bar): # --- is this possible?
...
yes, you give a new polymorphic_identity to Baz separate from
Bar. The only requirement is that they are all using the same
column on Foo for the differentiation (cascading polymorphic_on
columns isn't supported yet).
cheers,
Richard.
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attachment: richard.vcf
