IntegrityError on PATCH to resources detail

[AlanCoding]

Bug Summary

Running a migrate data command I saw this:

2024-07-24 14:11:30,418 django.request ERROR    Internal Server Error: /api/eda/v1/service-index/resources/dd85cdd2-e8f2-49b5-8a8c-bd1c33a6f5d5/
Traceback (most recent call last):
  File "/app/venv/lib64/python3.11/site-packages/django/db/backends/utils.py", line 89, in _execute
    return self.cursor.execute(sql, params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
psycopg2.errors.UniqueViolation: duplicate key value violates unique constraint "core_user_username_key"
DETAIL:  Key (username)=(eda:admin) already exists.


The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/app/venv/lib64/python3.11/site-packages/django/core/handlers/exception.py", line 55, in inner
    response = get_response(request)
               ^^^^^^^^^^^^^^^^^^^^^
  File "/app/venv/lib64/python3.11/site-packages/django/core/handlers/base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/venv/lib64/python3.11/site-packages/django/views/decorators/csrf.py", line 56, in wrapper_view
    return view_func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/venv/lib64/python3.11/site-packages/rest_framework/viewsets.py", line 124, in view
    return self.dispatch(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/venv/lib64/python3.11/site-packages/rest_framework/views.py", line 509, in dispatch
    response = self.handle_exception(exc)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/venv/lib64/python3.11/site-packages/rest_framework/views.py", line 469, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/app/venv/lib64/python3.11/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
    raise exc
  File "/app/venv/lib64/python3.11/site-packages/rest_framework/views.py", line 506, in dispatch
    response = handler(request, *args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/venv/lib64/python3.11/site-packages/rest_framework/mixins.py", line 82, in partial_update
    return self.update(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/venv/lib64/python3.11/site-packages/rest_framework/mixins.py", line 68, in update
    self.perform_update(serializer)
  File "/app/venv/lib64/python3.11/site-packages/rest_framework/mixins.py", line 78, in perform_update
    serializer.save()
  File "/app/venv/lib64/python3.11/site-packages/rest_framework/serializers.py", line 203, in save
    self.instance = self.update(self.instance, validated_data)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/venv/lib64/python3.11/site-packages/ansible_base/resource_registry/serializers.py", line 65, in update
    instance.update_resource(
  File "/app/venv/lib64/python3.11/site-packages/ansible_base/resource_registry/models/resource.py", line 137, in update_resource
    processor(self.content_object).save(resource_data)
  File "/app/venv/lib64/python3.11/site-packages/ansible_base/resource_registry/utils/resource_type_processor.py", line 40, in save
    self.instance.save()
  File "/app/venv/lib64/python3.11/site-packages/django/contrib/auth/base_user.py", line 76, in save
    super().save(*args, **kwargs)
  File "/app/venv/lib64/python3.11/site-packages/django/db/models/base.py", line 814, in save
    self.save_base(
  File "/app/venv/lib64/python3.11/site-packages/django/db/models/base.py", line 877, in save_base
    updated = self._save_table(
              ^^^^^^^^^^^^^^^^^
  File "/app/venv/lib64/python3.11/site-packages/django/db/models/base.py", line 990, in _save_table
    updated = self._do_update(
              ^^^^^^^^^^^^^^^^
  File "/app/venv/lib64/python3.11/site-packages/django/db/models/base.py", line 1054, in _do_update
    return filtered._update(values) > 0
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/venv/lib64/python3.11/site-packages/django/db/models/query.py", line 1231, in _update
    return query.get_compiler(self.db).execute_sql(CURSOR)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/venv/lib64/python3.11/site-packages/django/db/models/sql/compiler.py", line 1984, in execute_sql
    cursor = super().execute_sql(result_type)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/venv/lib64/python3.11/site-packages/django/db/models/sql/compiler.py", line 1562, in execute_sql
    cursor.execute(sql, params)
  File "/app/venv/lib64/python3.11/site-packages/django/db/backends/utils.py", line 102, in execute
    return super().execute(sql, params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/venv/lib64/python3.11/site-packages/django/db/backends/utils.py", line 67, in execute
    return self._execute_with_wrappers(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/venv/lib64/python3.11/site-packages/django/db/backends/utils.py", line 80, in _execute_with_wrappers
    return executor(sql, params, many, context)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/venv/lib64/python3.11/site-packages/django/db/backends/utils.py", line 84, in _execute
    with self.db.wrap_database_errors:
  File "/app/venv/lib64/python3.11/site-packages/django/db/utils.py", line 91, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/app/venv/lib64/python3.11/site-packages/django/db/backends/utils.py", line 89, in _execute
    return self.cursor.execute(sql, params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
django.db.utils.IntegrityError: duplicate key value violates unique constraint "core_user_username_key"
DETAIL:  Key (username)=(eda:admin) already exists.

172.24.0.1 - - [24/Jul/2024:14:11:30 +0000] "PATCH /api/eda/v1/service-index/resources/dd85cdd2-e8f2-49b5-8a8c-bd1c33a6f5d5/ HTTP/1.1" 500 220281 "-" "python-requests/2.31.0"

This shouldn't give a 500 error, it should give some version of a 400 error, and it needs to be in a format where the migration code can recognize it and take action.

It is anticipated that it's the resource viewset in DAB that needs to be patched so that this gives something other than a server error here.