Django 3.1: AttributeError: module 'django.db.models.fields' has no attribute 'FieldDoesNotExist' with annotation

[danjac]

This is raised in io.py when using an annotation:

   def to_fields(qs, fieldnames):
        for fieldname in fieldnames:
            model = qs.model
            for fieldname_part in fieldname.split('__'):
                try:
                    field = model._meta.get_field(fieldname_part)
>               except django.db.models.fields.FieldDoesNotExist:
E               AttributeError: module 'django.db.models.fields' has no attribute 'FieldDoesNotExist'

/usr/local/lib/python3.8/site-packages/django_pandas/io.py:12: AttributeError

This should be changed to django.core.exceptions.FieldDoesNotExist as this is removed in Django 3.1

https://docs.djangoproject.com/en/3.1/releases/3.1/

[thomasjbradley]

I would love this fixed also! But it seems like that fix means django-pandas wouldn’t be backwards compatible to Django>=1.4.5 then (at least from my quick digging around).

It’s a big problem because I cannot reference annotated fields in the fieldnames argument in Django/3.1.

[danjac]

It should be possible to check with an ImportError to know which version FieldDoesNotExist to use, if backward compatibility is needed.

[mateoreyes]

from django.core.exceptions import FieldDoesNotExist

def to_fields(qs, fieldnames):
        for fieldname in fieldnames:
            model = qs.model
            for fieldname_part in fieldname.split('__'):
                try:
                    field = model._meta.get_field(fieldname_part)
                  except FieldDoesNotExist: