pip - Python library `arrow` throws AttributeError: unknown attribute: "months"

Question

I'm in process of upgrading an existing project. After upgrading arrow to 0.17.0, it starts throwing an exception when on attribute of months.

The issue goes away if downgrade arrow to 0.13.x; but I hope to upgrade to the latest version and fix the issue in the good way. Any input will be highly appreciated.

  ...
  File "/data/app/PROJECT/projectapp/rest/views.py", line 219, in get_precache_redeemable_codes
    create_ts__gte=arrow.now().replace(months=-1).datetime)) 
  File "/data/app/venv3.7/lib/python3.7/site-packages/arrow/arrow.py", line 807, in replace
    raise AttributeError('unknown attribute: "{}"'.format(key))
AttributeError: unknown attribute: "months"

In my application source code, the triggering function call is:

create_ts__gte=arrow.now().replace(months=-1).datetime)) 
  .select_related('customer') 
  .prefetch_related('orderitem_set')

The full trace of exception:

[27/Jan/2021 14:44:32] ERROR [django.request:230] Internal Server Error: /api/redeem/precache/
Traceback (most recent call last):
  File "/data/app/venv3.7/lib/python3.7/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/data/app/venv3.7/lib/python3.7/site-packages/django/core/handlers/base.py", line 179, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/data/app/venv3.7/lib/python3.7/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "/data/app/venv3.7/lib/python3.7/site-packages/django/views/generic/base.py", line 70, in view
    return self.dispatch(request, *args, **kwargs)
  File "/data/app/venv3.7/lib/python3.7/site-packages/rest_framework/views.py", line 509, in dispatch
    response = self.handle_exception(exc)
  File "/data/app/venv3.7/lib/python3.7/site-packages/rest_framework/views.py", line 469, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/data/app/venv3.7/lib/python3.7/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
    raise exc
  File "/data/app/venv3.7/lib/python3.7/site-packages/rest_framework/views.py", line 506, in dispatch
    response = handler(request, *args, **kwargs)
  File "/data/app/venv3.7/lib/python3.7/site-packages/rest_framework/decorators.py", line 50, in handler
    return func(*args, **kwargs)
  File "/data/app/PROJECT/projectapp/rest/views.py", line 219, in get_precache_redeemable_codes
    create_ts__gte=arrow.now().replace(months=-1).datetime)) 
  File "/data/app/venv3.7/lib/python3.7/site-packages/arrow/arrow.py", line 807, in replace
    raise AttributeError('unknown attribute: "{}"'.format(key))
AttributeError: unknown attribute: "months"

question from:https://stackoverflow.com/questions/65934136/python-library-arrow-throws-attributeerror-unknown-attribute-months

Answer 1

Waitting for answers