Hi,
I am trying to do some ugly schemaception. A semi-working minimal
example is at
https://gist.github.com/fabianfreyer/f92054d260dc0485c649#file-field_storage-py.
The data model I am implementing is hierarchical, fieldable containers.
Field types are created by sub-classing Schema instances. This part works.
I am having problems implementing a way of grouping those fields by
their Category. For this purpose I have added a collection_class (see
lines 50-) that should take care of the grouping and be interfaceable as
a 2D dictionary as in
field = container.categories[category.name][field.name]
This works on the first access. On the second access it throws a
DetachedInstanceError (see
https://gist.github.com/fabianfreyer/f92054d260dc0485c649#file-traceback1)
To mitigate this I have added lines 63 to 65 (commented out in the
gist). When these are uncommented, there is also a DetachedInstanceError
(see
https://gist.github.com/fabianfreyer/f92054d260dc0485c649#file-traceback2)
I am running this in flask by the way.
What's the preferred way to deal with this? Am I on the completely wrong
track to group a collection?
Fabian Freyer
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