valid UUID is not a valid UUID

Question

I have a really weird problem were I'm getting that a valid UUID is not a valid UUID, for example:

'fd31b6b5-325d-4b65-b496-d7e4d16c8a93' is not a valid UUID.

File "/opt/python/run/venv/lib/python3.4/site-packages/django/db/models/fields/__init__.py" in get_db_prep_value
  2371.                 value = uuid.UUID(value)

File "/usr/lib64/python3.4/uuid.py" in __init__
  134.             hex = hex.replace('urn:', '').replace('uuid:', '')


      During handling of the above exception ('UUID' object has no attribute 'replace'), another exception occurred:

My models have an UUIDField as a pk, the error seems to happen randomly and won't dissapear until I restart the server, when the server restarts it works ok, so I'm a little lost here, I use django 1.10.7, postgresql 9.6.3, python 3.4.3 in amazon aws.

Edit:

Model causing trouble

class ReciboTransaccion(models.Model):    
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    ingreso = models.ForeignKey('banco.BaseTransaccion', related_name='recibo_ingreso',
                                on_delete=models.PROTECT,
                                null=True, blank=True,
                                editable=False)
    egreso = models.OneToOneField('banco.BaseTransaccion', related_name='recibo_egreso',
                                  on_delete=models.PROTECT,
                                  null=True, blank=True,
                                  editable=False)
    fecha = models.DateTimeField(auto_now_add=True)

The model 'BaseTransaccion' also has

id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)

Edit 2:

The code that triggers this error is the following

serial_movimientos = ReciboSerializer(recibos, many=True)

data = {
        'movimientos': serial_movimientos.data,  # Error happens here
    }

the serializer is pretty standard (serializer methods removed)

class ReciboSerializer(serializers.ModelSerializer):
    ingreso = serializers.SerializerMethodField()
    egresos = serializers.SerializerMethodField()
    descripcion = serializers.SerializerMethodField()
    monedero_generado = serializers.SerializerMethodField()
    reembolsada = serializers.SerializerMethodField()

    class Meta:
        model = ReciboTransaccion
        fields = ('ingreso', 'egresos', 'descripcion', 'monedero_generado', 'reembolsada', 'fecha', )

The rest of the traceback is:

File "/opt/python/run/venv/lib/python3.4/site-packages/django/core/handlers/exception.py" in inner
  42.             response = get_response(request)

File "/opt/python/run/venv/lib/python3.4/site-packages/django/core/handlers/base.py" in _get_response
  187.                 response = self.process_exception_by_middleware(e, request)

File "/opt/python/run/venv/lib/python3.4/site-packages/django/core/handlers/base.py" in _get_response
  185.                 response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/opt/python/run/venv/lib/python3.4/site-packages/django/views/decorators/csrf.py" in wrapped_view
  58.         return view_func(*args, **kwargs)

File "/opt/python/current/app/myproject/main/ws.py" in index
  129.                 json_data = func(request)

File "/opt/python/current/app/myproject/main/ws.py" in get_datos_home
  534.         'movimientos': serial_movimientos.data,

File "/opt/python/run/venv/lib/python3.4/site-packages/rest_framework/serializers.py" in data
  739.         ret = super(ListSerializer, self).data

File "/opt/python/run/venv/lib/python3.4/site-packages/rest_framework/serializers.py" in data
  263.                 self._data = self.to_representation(self.instance)

File "/opt/python/run/venv/lib/python3.4/site-packages/rest_framework/serializers.py" in to_representation
  657.             self.child.to_representation(item) for item in iterable

File "/opt/python/run/venv/lib/python3.4/site-packages/django/db/models/query.py" in __iter__
  256.         self._fetch_all()

File "/opt/python/run/venv/lib/python3.4/site-packages/django/db/models/query.py" in _fetch_all
  1087.             self._result_cache = list(self.iterator())

File "/opt/python/run/venv/lib/python3.4/site-packages/django/db/models/query.py" in __iter__
  54.         results = compiler.execute_sql()

File "/opt/python/run/venv/lib/python3.4/site-packages/django/db/models/sql/compiler.py" in execute_sql
  824.             sql, params = self.as_sql()

File "/opt/python/run/venv/lib/python3.4/site-packages/django/db/models/sql/compiler.py" in as_sql
  376.             where, w_params = self.compile(self.where) if self.where is not None else ("", [])

File "/opt/python/run/venv/lib/python3.4/site-packages/django/db/models/sql/compiler.py" in compile
  353.             sql, params = node.as_sql(self, self.connection)

File "/opt/python/run/venv/lib/python3.4/site-packages/django/db/models/sql/where.py" in as_sql
  79.                 sql, params = compiler.compile(child)

File "/opt/python/run/venv/lib/python3.4/site-packages/django/db/models/sql/compiler.py" in compile
  353.             sql, params = node.as_sql(self, self.connection)

File "/opt/python/run/venv/lib/python3.4/site-packages/django/db/models/lookups.py" in as_sql
  297.         return super(In, self).as_sql(compiler, connection)

File "/opt/python/run/venv/lib/python3.4/site-packages/django/db/models/lookups.py" in as_sql
  156.         rhs_sql, rhs_params = self.process_rhs(compiler, connection)

File "/opt/python/run/venv/lib/python3.4/site-packages/django/db/models/lookups.py" in process_rhs
  284.             sqls, sqls_params = self.batch_process_rhs(compiler, connection, rhs)

File "/opt/python/run/venv/lib/python3.4/site-packages/django/db/models/lookups.py" in batch_process_rhs
  51.             _, params = self.get_db_prep_lookup(rhs, connection)

File "/opt/python/run/venv/lib/python3.4/site-packages/django/db/models/lookups.py" in get_db_prep_lookup
  181.             if self.get_db_prep_lookup_value_is_iterable else

File "/opt/python/run/venv/lib/python3.4/site-packages/django/db/models/lookups.py" in <listcomp>
  180.             [get_db_prep_value(v, connection, prepared=True) for v in value]

File "/opt/python/run/venv/lib/python3.4/site-packages/django/db/models/fields/__init__.py" in get_db_prep_value
  2373.                 raise TypeError(self.error_messages['invalid'] % {'value': value})

Answer 1

Found a related Django issue and also mod_wsgi issue. For me, adding:

WSGIApplicationGroup %{GLOBAL}

to Apache config seems to have worked.