#18368: LayerMapping.save() should be able to set attributes on created model
instances
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Reporter: geoffhing@… | Owner: nobody
Type: New feature | Status: reopened
Component: GIS | Version: 1.4
Severity: Normal | Resolution:
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Changes (by geoffhing@…):
* status: closed => reopened
* resolution: wontfix =>
Comment:
@claudep, I just want to make sure you're clear on the use case that made
me request this. I'm bulk loading geometries using LayerMapping from a
management command (code at
https://github.com/PitonFoundation/atlas/blob/locations_places/apps/storybase_geo/management/commands/loadplaces.py).
The reason I needed to be able to pass additional model attributes to
LayerMapping.save() was to set a ForeignKey field to a model representing
levels of a geographic hierarchy. In my use case, this field can be null,
so that can't be used to identify the newly-created values. Also,
geometries may be loaded at different times and for different levels of
the geo hierarchy, so a default value for that field doesn't make sense.
Also, maybe I'm missing something, but I couldn't seem to find a way to
retrieve the model instances created by LayerMapping.save(). Certainly, I
could add a field to the model to indicate whether or not the model
instances had been post-processed in a second pass, but preferred not to
add fields to the model just to accommodate the occasional data load.
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Ticket URL: <https://code.djangoproject.com/ticket/18368#comment:2>
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