#31162: GIS error logging when using WKT string as input to filter() query
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Reporter: Arno | Owner: nobody
Type: Uncategorized | Status: new
Component: GIS | Version: 2.2
Severity: Normal | 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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When executing a geometry lookup like
`my_geo_model.objects.filter(my_geom__intersects=wkt_string)` (i.e. using
a WKT string as value) django.contrib.gis emits the following errors:
{{{
2020-01-13 10:16:07,145 - django.contrib.gis - ERROR - GDAL_ERROR 4:
b'POLYGON ((1 1, 1 0, 0 0, 0 1, 1 1)): No such file or directory'
2020-01-13 10:16:08,403 - django.contrib.gis - ERROR - GDAL_ERROR 10:
b"Pointer 'hObject' is NULL in 'GDALGetDescription'.\n"
}}}
The reason is that if passed a string, the string is first treated as a
potential filename which GDAL tries to open and fails ("no such file").
Only then it is tried to open the string as WKT/GeoJSON etc. Older Django
versions did not emit these errors. However, in commit 6f44f714c9 a check
in django/contrib/gis/gdal/raster/source.py:69 whether the file exists was
removed.
Silencing all errors from django.contrib.gis is not really a feasable
workaround, as it would mean silcencing interesting GIS errors too.
According to https://docs.djangoproject.com/en/2.2/ref/contrib/gis/db-api
/#geometry-lookups passing WKT strings is allowed, but there's no mention
of being able to pass a filename as parameter.
It's a bit unexpected that Django first tries to open a file before it
checks whether the passed string is valid WKT/GeoJSON, and that using WKT
results in error messages. Or am I misunderstanding the documentation and
calling the API wrongly?
Relevant parts of example source:
{{{
models.py:
class Area(models.Model):
area = models.PolygonField()
settings.py:
LOGGING = {
'version': 1,
'handlers': {
'console': {
'level': 'INFO',
'class': 'logging.StreamHandler',
},
},
'root': {
'handlers': ['console'],
'level': 'INFO',
}
}
main.py:
from app.models import Area
Area.objects.filter(area__intersects='POLYGON ((1 1, 1 0, 0 0, 0 1, 1
1))')
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/31162>
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