Additional computed fields

[lallulli]

Hi. I would like to add a new field to my FeatureType, not defined in my model, whose values are computed at runtime by a generic Python function.

I was able to add a computed field by subclassing XsdElement and overriding the get_value method, but I have to bind it to an existing field of my model (thus overriding the value read from the database). If I name my additional field with a name that does not exist in my model, I get a FieldDoesNotExist exception.

[vdboor]

Hi! Sounds like a wonderful deep-dive!

Currently the fields are indeed very bound to the model. This is a based-in assumption to support query filters on all fields. You are free to loosen this with a PR, but I suspect it might be hard work.

Since Django 5 offers a GeneratedField, this would likely be the best way to implement this. It would also allow querying the data.

[Yrob]

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