Opened 7 years ago
Closed 7 years ago
#28353 closed Bug (fixed)
QuerySet builds wrong SQL when the gis Length function is used and the queryset's query attribute is accessed
Reported by: | Aleksey Ruban | Owned by: | Sergey Fedoseev |
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Component: | GIS | Version: | 1.11 |
Severity: | Normal | Keywords: | QuerySet gis Length ProgrammingError |
Cc: | Triage Stage: | Accepted | |
Has patch: | no | Needs documentation: | no |
Needs tests: | no | Patch needs improvement: | no |
Easy pickings: | no | UI/UX: | no |
Description
I get ProgrammingError when trying to use the Length function from gis package. For this reason I can't use it with django-rest-framework. It throws the error when I try to get a list. This bug emerges in Django 1.10, 1.11. I don't try to test it against other versions.
Traceback (most recent call last): File "/media/sf_django/django_gis_bug/test_gis_bug/tests.py", line 16, in test_gis_bug features.first() File "/home/alex/.virtualenvs/django_test/local/lib/python2.7/site-packages/django/db/models/query.py", line 564, in first objects = list((self if self.ordered else self.order_by('pk'))[:1]) File "/home/alex/.virtualenvs/django_test/local/lib/python2.7/site-packages/django/db/models/query.py", line 250, in __iter__ self._fetch_all() File "/home/alex/.virtualenvs/django_test/local/lib/python2.7/site-packages/django/db/models/query.py", line 1105, in _fetch_all self._result_cache = list(self._iterable_class(self)) File "/home/alex/.virtualenvs/django_test/local/lib/python2.7/site-packages/django/db/models/query.py", line 53, in __iter__ results = compiler.execute_sql(chunked_fetch=self.chunked_fetch) File "/home/alex/.virtualenvs/django_test/local/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 886, in execute_sql raise original_exception ProgrammingError: function st_lengthspheroid(geometry, unknown, unknown) does not exist LINE 1: ...ug_feature"."id", "test_gis_bug_feature"."shape", ST_LengthS... ^ HINT: No function matches the given name and argument types. You might need to add explicit type casts.
It happens on access to the query attribute of the QuerySet class. On every access an additional parameter gets added to the st_lengthspheroid function.
models.py
from django.contrib.gis.db import models class Feature(models.Model): shape = models.LineStringField()
to test
from django.contrib.gis.db.models.functions import Length from .models import Feature features = Feature.objects.annotate(length=Length('shape')) # This action adds an additional parameter to the st_lengthspheroid # function every time you call the str function on the queryset str(features.query) # As a result it raises ProgrammingError, but it must pass without an error. features.first()
I created an app with a test case: https://github.com/rafick1983/django_gis_bug
Change History (4)
comment:1 by , 7 years ago
Component: | Database layer (models, ORM) → GIS |
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Summary: | QuerySet builds wrong SQL when the gis Length function is used → QuerySet builds wrong SQL when the gis Length function is used and the queryset's query attribute is accessed |
Triage Stage: | Unreviewed → Accepted |
comment:2 by , 7 years ago
Owner: | changed from | to
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Status: | new → assigned |
PR