#36441: Add lazy loading support for GDAL library in `django.contrib.gis.gdal`
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Reporter: Josh Thomas | Owner: Josh
Type: | Thomas
Cleanup/optimization | Status: assigned
Component: GIS | Version: dev
Severity: Normal | Resolution:
Keywords: gdal | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
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Comment (by Josh Thomas):
I'm not opposed to a system check. I can see the value from an API
stability perspective if people have been relying on eager failure to
catch misconfigurations. (Though I gotta admit it makes me think a little
bit of [https://xkcd.com/1172 this XKCD] 😆.)
GEOS has been lazy-loaded for ~10 years without a check, meaning
misconfigured GEOS installations have only been caught at runtime when
geometry fields are actually used and I haven’t really seen complaints
about that (though maybe I’ve just missed them!).
The question is: is a check needed because GDAL genuinely needs different
treatment than GEOS, or is this just noticing the gap while touching GDAL
code? I admit my ignorance on the details on the differences between the
two libraries here.
What would be the preference?
1. Add it to `BaseSpatialField` which would check both GEOS + GDAL
2. Add it to `RasterField` only, which uses GDAL but not GEOS, and would
more mirror the Pillow/`ImageField` pattern
3. Do nothing and let GDAL follow the same lazy pattern as GEOS
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Ticket URL: <https://code.djangoproject.com/ticket/36441#comment:12>
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