[fix] Attribute error when trying to get bounding box from a method field value #246

hemache · 2020-11-05T16:18:51Z

fixes #247

…ield value

TravisBuddy · 2020-11-05T19:41:59Z

Hey @hemache,
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TravisBuddy · 2020-11-06T00:10:48Z

Hey @hemache,
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nemesifier

Thanks for contributing @hemache, see my question below.

nemesifier · 2020-11-06T02:49:02Z

rest_framework_gis/serializers.py

+        if isinstance(field, SerializerMethodField):
+            method = getattr(field.parent, field.method_name)
+            geo_value = method(instance)
+            feature["geometry"] = field.to_representation(instance)


is using instance instead of geo_value intended?

is using instance instead of geo_value intended?

yes, because in this case, SerializerMethodField.to_representation receives object instance instead of the actual geometry value.

the problem was that geo_value initially stores the object instance (which doesn't provide .extent attribute), so here we're making sure to actually get the geometry value instead of the object instance.

ok, I don't understand then what's the purpose of calling geo_value = method(instance), it seems like that line can be removed, since geo_value is not used afterwards. Isn't it?
But I am also not entirely convinced of the approach as explained above.

since geo_value is not used afterwards. Isn't it?

yes, it's not used afterwards, but what if -later- someone else needed to use it?
I believe geo_value should have the correct/actual GEO value, not an instance of the object.

I don't understand this. I don't want to introduce changes in a library that is used by thousands of developers lightly. Each change must be justified.

@nemesisdesign it's justified. did you try to reproduce this bug?

focus on the type of geo_value variable. it should hold a GEO value and not something else, right?

@nemesisdesign if you're not convinced by my solution, then please try to reproduce the bug #247 and maybe suggest a proper fix?

TravisBuddy · 2020-11-06T03:32:58Z

Hey @hemache,
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hemache · 2020-11-06T10:43:09Z

@nemesisdesign any idea why the CI fails because it tries to access PostgreSQL?

atb00ker · 2020-11-08T10:27:10Z

@nemesisdesign any idea why the CI fails because it tries to access PostgreSQL?

@hemache Could you please try to change to dist: bionic in .travis.yml? It might help!

TravisBuddy · 2020-11-08T12:49:51Z

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atb00ker · 2020-11-08T13:18:59Z

Well, that didn't exactly help.

On inspection, I see:

Ver Cluster Port Status Owner    Data directory              Log file

12  main    5433 down   postgres /var/lib/postgresql/12/main /var/log/postgresql/postgresql-12-main.log

Perhaps cat /var/lib/postgresql/12/main /var/log/postgresql/postgresql-12-main.log would help. It should be a postgresql version problem, changing and experimenting with some other versions could help.

…er authentication for user "postgres"

hemache · 2020-11-11T20:29:49Z

fixed PostgreSQL issue.

but now I'm getting this error (e.g. https://travis-ci.com/github/openwisp/django-rest-framework-gis/jobs/433971220)

free(): invalid pointer
ERROR: InvocationError for command /home/travis/build/openwisp/django-rest-framework-gis/.tox/travis/bin/coverage run --source=rest_framework_gis ./tests/manage.py test tests/django_restframework_gis_tests (exited with code -6 (SIGABRT)) (exited with code -6)
___________________________________ summary ____________________________________
ERROR:   travis: commands failed
The command "tox -e travis" exited with 1.

though, I can't reproduce this in my local dev env

coverage run --source=rest_framework_gis ./tests/manage.py test tests/django_restframework_gis_tests
Creating test database for alias 'default'...
System check identified no issues (0 silenced).
............................s.........
GeoJSON rendering of 10000 objects completed in 6.299168238998391
.....s......./home/hemache/.local/share/virtualenvs/django-rest-framework-gis-EHv3zJno/lib/python3.8/site-packages/djangorestframework-3.12.1-py3.8.egg/rest_framework/pagination.py:200: UnorderedObjectListWarning: Pagination may yield inconsistent results with an unordered object_list: <class 'django_restframework_gis_tests.models.Location'> QuerySet.
  paginator = self.django_paginator_class(queryset, page_size)
............................
----------------------------------------------------------------------
Ran 79 tests in 63.766s

OK (skipped=2)
Destroying test database for alias 'default'...

any ideas?

nemesifier · 2020-11-11T21:23:43Z

@hemache did you already try using bionic as distro? Sometimes changing distro fixes these inexplicable issues.

hemache · 2020-11-12T09:10:56Z

@nemesisdesign yep, I tried that before

The following packages have unmet dependencies:
 gdal-bin : Depends: python3-gdal (= 3.0.4+dfsg-1~bionic0) but it is not going to be installed
            Depends: libgdal26 (>= 3.0.0) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
The command "sudo apt-get install binutils libproj-dev gdal-bin -y" failed and exited with 100 during .

https://travis-ci.com/github/openwisp/django-rest-framework-gis/jobs/434284716

can we please merge this anyway and fix CI issues later? (tests are passing btw)

hemache · 2020-12-01T15:42:22Z

@nemesisdesign any update on this, please? we're still using the patched version from my forked Github repo, I hope we can switch back to the official version in PyPi

atb00ker

Just one comment from my end,
I'll defer the rest to @nemesisdesign

.travis.yml

tests/django_restframework_gis_tests/urls.py

nemesifier

I am not sure of this change.
There's some repetition to check if the field is a SerializerMethodField.
I guess it could be resolved by changing the way SerializerMethodField and GeoFeatureModelSerializer interact.

I will look into it as soon as possible.

nemesifier · 2020-12-02T15:59:13Z

rest_framework_gis/serializers.py

+        if isinstance(field, SerializerMethodField):
+            method = getattr(field.parent, field.method_name)
+            geo_value = method(instance)
+            feature["geometry"] = field.to_representation(instance)


ok, I don't understand then what's the purpose of calling geo_value = method(instance), it seems like that line can be removed, since geo_value is not used afterwards. Isn't it?
But I am also not entirely convinced of the approach as explained above.

hemache · 2020-12-08T11:15:20Z

do you think this is ready to be merged?

auvipy · 2020-12-09T05:20:09Z

this need rebase

nemesifier · 2021-01-23T15:13:15Z

Not ready to merge: #246 (comment)

hemache added 2 commits November 5, 2020 17:15

[fix] attribute error when trying to get bounding box from a method f…

58ec8d0

…ield value

[qa] Test bounding box calculation when using method field for geo field

1d57899

[qa] Format code

191209b

nemesifier reviewed Nov 6, 2020

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hemache force-pushed the fix-geoserializer-bbox-getter branch 3 times, most recently from b03cad0 to a52ae4b Compare November 11, 2020 18:45

[qa] Change PostgreSQL database port back to default value & Allow pe…

0040739

…er authentication for user "postgres"

hemache force-pushed the fix-geoserializer-bbox-getter branch from ebcba18 to 0040739 Compare November 11, 2020 19:09

hemache force-pushed the fix-geoserializer-bbox-getter branch from f7b09ed to 0040739 Compare November 12, 2020 09:11

nemesifier added the bug label Nov 13, 2020

atb00ker reviewed Dec 1, 2020

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.travis.yml Outdated Show resolved Hide resolved

auvipy reviewed Dec 2, 2020

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tests/django_restframework_gis_tests/urls.py Show resolved Hide resolved

[qa] Rollback CI PostgreSQL default port fix

84cd642

nemesifier reviewed Dec 2, 2020

View reviewed changes

nemesifier force-pushed the master branch 2 times, most recently from d137601 to f2dc812 Compare May 9, 2022 23:09

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[fix] Attribute error when trying to get bounding box from a method field value #246

[fix] Attribute error when trying to get bounding box from a method field value #246

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[fix] Attribute error when trying to get bounding box from a method field value #246

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[fix] Attribute error when trying to get bounding box from a method field value #246

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