Pickling Error

[CodingPupper3033]

Hello,

I am trying to make a plugin with an API, and I am getting a Pickling error. I was hoping for some assistance as I haven't been able to figure out why.

I am still trying to make a plugin to track items as they are loaned. I have figured out how to create models and how to add their API URLs using setup_urls(). I am able to see the API and interact with it; that part works. However, in the plugin's settings, I am unable to change any of the settings my plugin exposes as it returns the error: Can't pickle <function LoanSessionDetail at 0x7f924ce1cb80>: it's not the same object as loanmanagement.api.LoanSessionDetail (fails when making a request to the URL /api/plugins/settings/loan/DEFAULT_LOAN_DURATION_DAYS/ )

I have looked through countless articles, Inventree source code, tutorials, stack overflow, etc, to no avail. I was hoping you guys may be able to figure out the issue or be able to tell me to use a different format to integrate with Inventree.

Fragments of my code that I would believe to be useful follow. If you need more, let me know!

Starting with the main plugin file, I was sure to extend both SettingsMixin and UrlsMixin.
loanmanagement.py file:

class LoaningManagementPlugin(AppMixin, ActionMixin, SettingsMixin, UrlsMixin, NavigationMixin, PanelMixin,
                              InvenTreePlugin):

Further in the file, I have the setup URLs function that should call my API views. (This is the attempt that allows me to see the API but not change the plugin's settings)

    def setup_urls(self):
        from . import api
        loan_session_api_urls = [
            path(r'<int:pk>/', include([
                re_path(r'^.*$', api.LoanSessionDetail.as_view(), name='api-part-detail')
            ])),
            re_path(r'^.*$', api.LoanSessionList.as_view(), name='api-loan-session-list'),
        ]

        return [
            re_path(r'^hi/', self.view_test, name='hi'),
            re_path(r'^add/', self.add_loan, name='add'),
            re_path(r'^get/', self.get_loan, name='get'),
            re_path(r'^api/', include(loan_session_api_urls), name="api"),
            # re_path(r'^test/', api.LoanSessionList.as_view(), name='api-loan-session-list')
        ]

Also, I defined settings in the same file:

    SETTINGS = {
        'DEFAULT_LOAN_DURATION_DAYS': {
            'name': _('Default Loan Duration'),  # TODO Rewrite
            'description': "The default duration an item will be loaned for in days.",  # TODO Rewrite
            'default': 28,
            'validator': [
                int,
                MinValueValidator(0)
            ]
        }
    }

In my api.py file, I made a class for any LoanSession request then had subclasses for the endpoints themself in a very similar manner as the parts app does it:

from .models import (LoanSession)
from .serializers import (LoanSessionSerializer)


class LoanSessionMixin:
    """Mixin class for LoanSession API endpoints"""
    serializer_class = LoanSessionSerializer
    queryset = LoanSession.objects.all()


class LoanSessionList(LoanSessionMixin, ListCreateAPI):
    """API endpoint for accessing a list of LoanSession objects, or creating a new LoanSession instance"""
    pass


class LoanSessionDetail(LoanSessionMixin, RetrieveUpdateDestroyAPI):
    """API endpoint for detail view of a single LoanSession object."""
    pass

I understand that I am trying to make a plugin that does more than it is intended. I am starting to believe that is the reason why this is not working, and if that is the reason you come to aswell, let me know and I will try to find another way.

I really truly appreciate any time you can spend helping me. I am asking as I have spent considerable time trying to figure this out myself and have made no progress.

[SchrodingersGat]

@CodingPupper3033 what version are you running? This issue sounds like #5408 which was fixed in #5412 (and in the latest stable release)

[CodingPupper3033]

How would I check the version? (I know it's a silly question)

[CodingPupper3033]

I am on commit #5236 (I didn't realize how old my instance was getting!); I will update and see if that fixes it. Thank you! :)

[CodingPupper3033]

Updating to the latest version fixed the issue. My apologies for my obvious blunders!