ValueError: 'EnterpriseCustomer' instance needs to have a primary key value before this relationship can be used. when setting default_language on create

[tramck]

Environment:

Python version: 3.11
Open edX version: redwood
Enterprise version: 4.17.4

Issue

When creating an Enterprise Customer via django-admin and setting the Learner Default Language field, the enterprise_customer.enterprise_customer_users relationship is accessed prior to the enterprise customer instance being created which triggers an uncaught exception: ValueError: 'EnterpriseCustomer' instance needs to have a primary key value before this relationship can be used.

Stack Trace

 Traceback (most recent call last):                                                                                              
   File "/openedx/venv/lib/python3.11/site-packages/django/core/handlers/exception.py", line 55, in inner                        
     response = get_response(request)                                                                                            
                ^^^^^^^^^^^^^^^^^^^^^                                                                                            
   File "/openedx/venv/lib/python3.11/site-packages/django/core/handlers/base.py", line 197, in _get_response                    
     response = wrapped_callback(request, *callback_args, **callback_kwargs)                                                     
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                     
   File "/opt/pyenv/versions/3.11.8/lib/python3.11/contextlib.py", line 81, in inner                                             
     return func(*args, **kwds)                                                                                                  
            ^^^^^^^^^^^^^^^^^^^                                                                                                  
   File "/openedx/venv/lib/python3.11/site-packages/newrelic/hooks/framework_django.py", line 529, in wrapper                    
     return wrapped(*args, **kwargs)                                                                                             
            ^^^^^^^^^^^^^^^^^^^^^^^^                                                                                             
   File "/openedx/venv/lib/python3.11/site-packages/django/contrib/admin/options.py", line 688, in wrapper                       
     return self.admin_site.admin_view(view)(*args, **kwargs)                                                                    
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                                    
   File "/openedx/venv/lib/python3.11/site-packages/django/utils/decorators.py", line 134, in _wrapper_view                      
     response = view_func(request, *args, **kwargs)                                                                              
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                                              
   File "/openedx/venv/lib/python3.11/site-packages/django/views/decorators/cache.py", line 62, in _wrapper_view_func            
     response = view_func(request, *args, **kwargs)                                                                              
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                                              
   File "/openedx/venv/lib/python3.11/site-packages/django/contrib/admin/sites.py", line 242, in inner                           
     return view(request, *args, **kwargs)                                                                                       
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                                                       
   File "/openedx/venv/lib/python3.11/site-packages/django/contrib/admin/options.py", line 1886, in add_view                     
     return self.changeform_view(request, None, form_url, extra_context)                                                         
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                         
   File "/openedx/venv/lib/python3.11/site-packages/django/utils/decorators.py", line 46, in _wrapper                            
     return bound_method(*args, **kwargs)                                                                                        
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                                                        
   File "/openedx/venv/lib/python3.11/site-packages/django/utils/decorators.py", line 134, in _wrapper_view                      
     response = view_func(request, *args, **kwargs)                                                                              
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                                              
   File "/openedx/venv/lib/python3.11/site-packages/django/contrib/admin/options.py", line 1747, in changeform_view              
     return self._changeform_view(request, object_id, form_url, extra_context)                                                   
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                   
   File "/openedx/venv/lib/python3.11/site-packages/django/contrib/admin/options.py", line 1798, in _changeform_view             
     self.save_model(request, new_object, form, not add)                                                                         
   File "/openedx/venv/lib/python3.11/site-packages/simple_history/admin.py", line 228, in save_model                            
     super().save_model(request, obj, form, change)                                                                              
   File "/openedx/venv/lib/python3.11/site-packages/django/contrib/admin/options.py", line 1227, in save_model                   
     obj.save()                                                                                                                  
   File "/openedx/venv/lib/python3.11/site-packages/model_utils/models.py", line 37, in save                                     
     super().save(*args, **kwargs)                                                                                               
   File "/openedx/venv/lib/python3.11/site-packages/django/db/models/base.py", line 814, in save                                 
     self.save_base(                                                                                                             
   File "/openedx/venv/lib/python3.11/site-packages/django/db/models/base.py", line 861, in save_base                            
     pre_save.send(                                                                                                              
   File "/openedx/venv/lib/python3.11/site-packages/django/dispatch/dispatcher.py", line 176, in send                            
     return [                                                                                                                    
            ^                                                                                                                    
   File "/openedx/venv/lib/python3.11/site-packages/django/dispatch/dispatcher.py", line 177, in <listcomp>                      
     (receiver, receiver(signal=self, sender=sender, **named))                                                                   
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                                    
   File "/openedx/venv/lib/python3.11/site-packages/enterprise/signals.py", line 110, in update_lang_pref_of_all_learners        
     unset_language_of_all_enterprise_learners(instance)                                                                         
   File "/openedx/venv/lib/python3.11/site-packages/enterprise/utils.py", line 2230, in unset_language_of_all_enterprise_learners
     user_ids = list(enterprise_customer.enterprise_customer_users.values_list('user_id', flat=True))                            
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                             
   File "/openedx/venv/lib/python3.11/site-packages/django/db/models/manager.py", line 87, in manager_method                     
     return getattr(self.get_queryset(), name)(*args, **kwargs)                                                                  
                    ^^^^^^^^^^^^^^^^^^^                                                                                          
   File "/openedx/venv/lib/python3.11/site-packages/django/db/models/fields/related_descriptors.py", line 718, in get_queryset   
     raise ValueError(                                                                                                           
 ValueError: 'EnterpriseCustomer' instance needs to have a primary key value before this relationship can be used.