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Home/ Questions/Q 272643
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Editorial Team
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Editorial Team
Asked: May 12, 20262026-05-12T00:20:23+00:00 2026-05-12T00:20:23+00:00

If I create a PolyModel class, such as Person, can I create an Expando

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If I create a PolyModel class, such as Person, can I create an Expando model under that Polymodel? For instance, a class Male(Person) that was also an Expando model? If so, how?

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  1. Editorial Team
    Editorial Team
    2026-05-12T00:20:24+00:00Added an answer on May 12, 2026 at 12:20 am

    Quote from PolyModel documentation:

    PolyModel does not support dynamic properties, like Expando does. There is not an equivalent of PolyModel for Expando.

    However, there are ways to work around this by using lower-level datastore APIs. They should work fine even with the PolyModel class. But the code won’t be very nice and I don’t recommend it. I don’t have time to throw together an example now, but maybe I will tomorrow if noone else does it.

    For now you could have a look at a PolyModel class I wrote before Google released their own (and yes, the fact that the two have the same name is pure coincidence =), it might inspire you on how to make your own Expando-supporting version, should you come up short of other solutions. Here it is: PolyModel class and PolyModel example.

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