CODEWITHSUNDEEP
google-app-enginegoogle-cloud-datastore
Yarin
Yarin

Reputation: 183499

Converting a Model to PolyModel in Google App Engine

What are the consequences if you switch a model's base class from db.Model to db.PolyModel (You decide you want to add polymorphism) after it already has entities stored in the datastore?

Also, is there any reason not to always create your models as PolyModels, so subclassing is never an issue?

Upvotes: 0

Views: 214

Answers (1)

Shay Erlichmen
Shay Erlichmen

Reputation: 31928

As for you for your first question, it doesn't seem like an issue, since changing modal base class is a documented way to remove properties by Google.

I believe that PolyModel has some hidden cost when accessing the properties, this is why you should start with Model and switch only if necessary.

Upvotes: 3

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