SerializerMutation creates excess types for fields with same serializer class

I use SerializerMutation to create/update objects:

from graphene_django.rest_framework.mutation import SerializerMutation

class ShipmentMutation(SerializerMutation):
    class Meta:
        serializer_class = ShipmentSerializer

Here is ShipmentSerializer:

from rest_framework import serializers

from logistics.models import City
from logistics.serializers import CitySerializer

from .models import Shipment


class ShipmentSerializer(serializers.ModelSerializer):
    owner = serializers.PrimaryKeyRelatedField(read_only=True)
    origin = CitySerializer(read_only=True)
    destination = CitySerializer(read_only=True)

    class Meta:
        model = Shipment
        exclude = ('created_at', 'updated_at', )

…and CitySerializer:

class CitySerializer(serializers.ModelSerializer):
    class Meta:
        model = City
        fields = ('id', 'name', )
        read_only_fields = ('id', 'name', )

So there is ttwo similar fields serialized by CitySerializer: origin and destination and while creating appropriate types for it raises an error:

AssertionError: Found different types with the same name in the schema: CitySerializerInput, CitySerializerInput.

Full trace

Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x7fb41bb8b620>
Traceback (most recent call last):
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/django/utils/autoreload.py", line 225, in wrapper
    fn(*args, **kwargs)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/channels/management/commands/runserver.py", line 55, in inner_run
    self.check(display_num_errors=True)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/django/core/management/base.py", line 364, in check
    include_deployment_checks=include_deployment_checks,
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/django/core/management/base.py", line 351, in _run_checks
    return checks.run_checks(**kwargs)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/django/core/checks/registry.py", line 73, in run_checks
    new_errors = check(app_configs=app_configs)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/django/core/checks/urls.py", line 40, in check_url_namespaces_unique
    all_namespaces = _load_all_namespaces(resolver)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/django/core/checks/urls.py", line 57, in _load_all_namespaces
    url_patterns = getattr(resolver, 'url_patterns', [])
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/django/utils/functional.py", line 36, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/django/urls/resolvers.py", line 540, in url_patterns
    patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/django/utils/functional.py", line 36, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/django/urls/resolvers.py", line 533, in urlconf_module
    return import_module(self.urlconf_name)
  File "/usr/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 "/someusernamehere/donnyyy/Workspace/m100/m100-backend/m100/urls.py", line 21, in <module>
    from main.views import graphql_view
  File "/someusernamehere/donnyyy/Workspace/m100/m100-backend/main/views.py", line 100, in <module>
    '.')[:-1])), settings.GRAPHENE['SCHEMA'].split('.')[-1])
  File "/usr/lib/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "/someusernamehere/donnyyy/Workspace/m100/m100-backend/main/schema.py", line 75, in <module>
    + car_types
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphene/types/schema.py", line 62, in __init__
    self.build_typemap()
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphene/types/schema.py", line 126, in build_typemap
    initial_types, auto_camelcase=self.auto_camelcase, schema=self
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphene/types/typemap.py", line 80, in __init__
    super(TypeMap, self).__init__(types)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphql/type/typemap.py", line 28,in __init__
    self.update(reduce(self.reducer, types, OrderedDict()))  # type: ignore
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphene/types/typemap.py", line 88, in reducer
    return self.graphene_reducer(map, type)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphene/types/typemap.py", line 117, in graphene_reducer
    return GraphQLTypeMap.reducer(map, internal_type)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphql/type/typemap.py", line 106, in reducer
    field_map = type.fields
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphql/pyutils/cached_property.py", line 22, in __get__
    value = obj.__dict__[self.func.__name__] = self.func(obj)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphql/type/definition.py", line 221, in fields
    return define_field_map(self, self._fields)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphql/type/definition.py", line 235, in define_field_map
    field_map = field_map()
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphene/types/typemap.py", line 286, in construct_fields_for_type
    map = self.reducer(map, arg.type)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphene/types/typemap.py", line 88, in reducer
    return self.graphene_reducer(map, type)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphene/types/typemap.py", line 93, in graphene_reducer
    return self.reducer(map, type.of_type)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphene/types/typemap.py", line 88, in reducer
    return self.graphene_reducer(map, type)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphene/types/typemap.py", line 117, in graphene_reducer
    return GraphQLTypeMap.reducer(map, internal_type)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphql/type/typemap.py", line 106, in reducer
    field_map = type.fields
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphql/pyutils/cached_property.py", line 22, in __get__
    value = obj.__dict__[self.func.__name__] = self.func(obj)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphql/type/definition.py", line 655, in fields
    return self._define_field_map()
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphql/type/definition.py", line 660, in _define_field_map
    fields = self._fields()
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphene/types/typemap.py", line 274, in construct_fields_for_type
    map = self.reducer(map, field.type)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphene/types/typemap.py", line 88, in reducer
    return self.graphene_reducer(map, type)
  File "/home/someusernamehere/.local/lib/python3.6/site-packages/graphene/types/typemap.py", line 99, in graphene_reducer
    ).format(_type.graphene_type, type)
AssertionError: Found different types with the same name in the schema: CitySerializerInput, CitySerializerInput.

[Shehab-Muhammad]

We still facing same error

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.