Custom DEFAULT_PAGINATION_CLASS breaking Django migration script

Discussion:

Chloe

2018-09-25 17:34:37 UTC

Hi there! I'm using a custom DEFAULT_PAGINATION_CLASS.

It all loads, unit tests, and runs properly with the class's pagination,
but when I try to run python manage.py migrate, I get an error from DRF's
code trying to load DEFAULT_PAGINATION_CLASS. It complains AttributeError:
module 'api.pagination' has no attribute 'PrimaryKeySortedPagination'.

I've tried:

- moving the pagination file into my core app alongside settings.py
- putting my 'api' app above 'rest_framework' in INSTALLED_APPS
- adding 'from pagination import PrimaryKeySortedPagination' to api's
__init__.py
- and a few other things.

Any help's appreciated! Thanks!

In my settings.py:

REST_FRAMEWORK = {

....

....

....

'DEFAULT_PAGINATION_CLASS': 'api.pagination.PrimaryKeySortedPagination',

'PAGE_SIZE': 100,
}

LOG:

Traceback (most recent call last):
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/settings.py"
, line 184, in import_from_string
return getattr(module, class_name)
AttributeError: module 'api.pagination' has no attribute
'PrimaryKeySortedPagination'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/settings.py"
, line 183, in import_from_string
module = import_module(module_path)
File "/app/.heroku/python/lib/python3.6/importlib/__init__.py", line 126,
in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 994, in _gcd_import
File "<frozen importlib._bootstrap>", line 971, in _find_and_load
File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 678, in exec_module
File "<frozen importlib._bootstrap>", line 219, in
_call_with_frames_removed
File "/app/api/pagination.py", line 4, in <module>
from rest_framework import permissions, status, viewsets, mixins,
pagination
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/viewsets.py"
, line 27, in <module>
from rest_framework import generics, mixins, views
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/generics.py"
, line 26, in <module>
class GenericAPIView(views.APIView):
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/generics.py"
, line 48, in GenericAPIView
pagination_class = api_settings.DEFAULT_PAGINATION_CLASS
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/settings.py"
, line 227, in __getattr__
val = perform_import(val, attr)
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/settings.py"
, line 170, in perform_import
return import_from_string(val, setting_name)
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/settings.py"
, line 187, in import_from_string
raise ImportError(msg)
ImportError: Could not import 'api.pagination.PrimaryKeySortedPagination'
for API setting 'DEFAULT_PAGINATION_CLASS'. AttributeError: module
'api.pagination' has no attribute 'PrimaryKeySortedPagination'.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "manage.py", line 15, in <module>
execute_from_command_line(sys.argv)
File
"/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py"
, line 381, in execute_from_command_line
utility.execute()
File
"/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py"
, line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File
"/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py"
, line 316, in run_from_argv
self.execute(*args, **cmd_options)
File
"/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py"
, line 350, in execute
self.check()
File
"/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py"
, line 379, in check
include_deployment_checks=include_deployment_checks,
File
"/app/.heroku/python/lib/python3.6/site-packages/django/core/management/commands/migrate.py"
, line 60, in _run_checks
issues.extend(super()._run_checks(**kwargs))
File
"/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py"
, line 366, in _run_checks
return checks.run_checks(**kwargs)
File
"/app/.heroku/python/lib/python3.6/site-packages/django/core/checks/registry.py"
, line 71, in run_checks
new_errors = check(app_configs=app_configs)
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/checks.py",
line 9, in pagination_system_check
if api_settings.PAGE_SIZE and not api_settings.DEFAULT_PAGINATION_CLASS:
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/settings.py"
, line 227, in __getattr__
val = perform_import(val, attr)
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/settings.py"
, line 170, in perform_import
return import_from_string(val, setting_name)
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/settings.py"
, line 187, in import_from_string
raise ImportError(msg)
ImportError: Could not import 'api.pagination.PrimaryKeySortedPagination'
for API setting 'DEFAULT_PAGINATION_CLASS'. ImportError: Could not import
'api.pagination.PrimaryKeySortedPagination' for API setting 'DEFA
ULT_PAGINATION_CLASS'. AttributeError: module 'api.pagination' has no
attribute 'PrimaryKeySortedPagination'..

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cbertinato via Django REST framework

2018-09-26 11:12:20 UTC

Permalink

Did you try adding the project to the name?

'DEFAULT_PAGINATION_CLASS': 'app.api.pagination.PrimaryKeySortedPagination'

Here's the example in the
docs: http://www.django-rest-framework.org/api-guide/pagination/#using-your-custom-pagination-class

Post by Chloe
Hi there! I'm using a custom DEFAULT_PAGINATION_CLASS.
It all loads, unit tests, and runs properly with the class's pagination,
but when I try to run python manage.py migrate, I get an error from DRF's
module 'api.pagination' has no attribute 'PrimaryKeySortedPagination'.
- moving the pagination file into my core app alongside settings.py
- putting my 'api' app above 'rest_framework' in INSTALLED_APPS
- adding 'from pagination import PrimaryKeySortedPagination' to api's
__init__.py
- and a few other things.
Any help's appreciated! Thanks!
REST_FRAMEWORK = {
....
....
....
'api.pagination.PrimaryKeySortedPagination',
'PAGE_SIZE': 100,
}
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/settings.py"
, line 184, in import_from_string
return getattr(module, class_name)
AttributeError: module 'api.pagination' has no attribute
'PrimaryKeySortedPagination'
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/settings.py"
, line 183, in import_from_string
module = import_module(module_path)
File "/app/.heroku/python/lib/python3.6/importlib/__init__.py", line 126
, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 994, in _gcd_import
File "<frozen importlib._bootstrap>", line 971, in _find_and_load
File "<frozen importlib._bootstrap>", line 955, in
_find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 678, in exec_module
File "<frozen importlib._bootstrap>", line 219, in
_call_with_frames_removed
File "/app/api/pagination.py", line 4, in <module>
from rest_framework import permissions, status, viewsets, mixins,
pagination
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/viewsets.py"
, line 27, in <module>
from rest_framework import generics, mixins, views
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/generics.py"
, line 26, in <module>
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/generics.py"
, line 48, in GenericAPIView
pagination_class = api_settings.DEFAULT_PAGINATION_CLASS
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/settings.py"
, line 227, in __getattr__
val = perform_import(val, attr)
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/settings.py"
, line 170, in perform_import
return import_from_string(val, setting_name)
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/settings.py"
, line 187, in import_from_string
raise ImportError(msg)
ImportError: Could not import 'api.pagination.PrimaryKeySortedPagination'
for API setting 'DEFAULT_PAGINATION_CLASS'. AttributeError: module
'api.pagination' has no attribute 'PrimaryKeySortedPagination'.
File "manage.py", line 15, in <module>
execute_from_command_line(sys.argv)
File
"/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py"
, line 381, in execute_from_command_line
utility.execute()
File
"/app/.heroku/python/lib/python3.6/site-packages/django/core/management/__init__.py"
, line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File
"/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py"
, line 316, in run_from_argv
self.execute(*args, **cmd_options)
File
"/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py"
, line 350, in execute
self.check()
File
"/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py"
, line 379, in check
include_deployment_checks=include_deployment_checks,
File
"/app/.heroku/python/lib/python3.6/site-packages/django/core/management/commands/migrate.py"
, line 60, in _run_checks
issues.extend(super()._run_checks(**kwargs))
File
"/app/.heroku/python/lib/python3.6/site-packages/django/core/management/base.py"
, line 366, in _run_checks
return checks.run_checks(**kwargs)
File
"/app/.heroku/python/lib/python3.6/site-packages/django/core/checks/registry.py"
, line 71, in run_checks
new_errors = check(app_configs=app_configs)
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/checks.py"
, line 9, in pagination_system_check
if api_settings.PAGE_SIZE and not api_settings.
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/settings.py"
, line 227, in __getattr__
val = perform_import(val, attr)
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/settings.py"
, line 170, in perform_import
return import_from_string(val, setting_name)
File
"/app/.heroku/python/lib/python3.6/site-packages/rest_framework/settings.py"
, line 187, in import_from_string
raise ImportError(msg)
ImportError: Could not import 'api.pagination.PrimaryKeySortedPagination'
for API setting 'DEFAULT_PAGINATION_CLASS'. ImportError: Could not import
'api.pagination.PrimaryKeySortedPagination' for API setting 'DEFA
ULT_PAGINATION_CLASS'. AttributeError: module 'api.pagination' has no
attribute 'PrimaryKeySortedPagination'..

Chloe

2018-10-02 16:01:03 UTC

Permalink

I tried that with both the root dir name and the project name, but it
complains "No module named 'amp.api'" and "No module named 'amp-server'"
for:
amp.api.v1.pagination.PrimaryKeySortedPagination
and
amp-server.api.v1.pagination.PrimaryKeySortedPagination

My apps are structured at the root folder, rather than as nested apps of
the project dir:
.../amp-server/amp/settings.py
.../amp-server/api/v1/pagination.py
.../amp-server/api/v1/serializers.py