On United4Earth, I have the `ActionGroup` model : https://git.happy-dev.fr/startinblox/applications/united4earth/blob/dev/data_manager/models.py#L90 It has a `ManyToMany` relationship to itself : ```python actiongroups = models.ManyToManyField("self", blank=True) ``` When I create an `ActionGroup` and try to associate two together, I get the following error : ```log AttributeError at /api/actiongroups/ 'ManyJsonLdRelatedField' object has no attribute 'child' Request Method: POST Request URL: http://127.0.0.1:8000/api/actiongroups/ Django Version: 1.11.20 Python Executable: /usr/bin/python3 Python Version: 3.6.7 Python Path: ['/var/www/united4earth', '/usr/lib/python36.zip', '/usr/lib/python3.6', '/usr/lib/python3.6/lib-dynload', '/home/alex/.local/lib/python3.6/site-packages', '/usr/local/lib/python3.6/dist-packages', '/usr/lib/python3/dist-packages'] Server time: ven, 17 Mai 2019 08:03:05 +0200 Installed Applications: ['united4earth', 'data_manager', 'djangoldp_conversation', 'djangoldp', 'guardian', 'registration', 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles'] Installed Middleware: ['django.middleware.security.SecurityMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.common.CommonMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', 'django.middleware.clickjacking.XFrameOptionsMiddleware'] Traceback: File "/home/alex/.local/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner 41. response = get_response(request) File "/home/alex/.local/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response 187. response = self.process_exception_by_middleware(e, request) File "/home/alex/.local/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response 185. response = wrapped_callback(request, *callback_args, **callback_kwargs) File "/home/alex/.local/lib/python3.6/site-packages/django/views/decorators/csrf.py" in wrapped_view 58. return view_func(*args, **kwargs) File "/home/alex/.local/lib/python3.6/site-packages/rest_framework/viewsets.py" in view 116. return self.dispatch(request, *args, **kwargs) File "/home/alex/.local/lib/python3.6/site-packages/djangoldp/views.py" in dispatch 136. response = super(LDPViewSet, self).dispatch(request, *args, **kwargs) File "/home/alex/.local/lib/python3.6/site-packages/rest_framework/views.py" in dispatch 495. response = self.handle_exception(exc) File "/home/alex/.local/lib/python3.6/site-packages/rest_framework/views.py" in handle_exception 455. self.raise_uncaught_exception(exc) File "/home/alex/.local/lib/python3.6/site-packages/rest_framework/views.py" in dispatch 492. response = handler(request, *args, **kwargs) File "/home/alex/.local/lib/python3.6/site-packages/rest_framework/mixins.py" in create 20. serializer.is_valid(raise_exception=True) File "/home/alex/.local/lib/python3.6/site-packages/rest_framework/serializers.py" in is_valid 236. self._validated_data = self.run_validation(self.initial_data) File "/home/alex/.local/lib/python3.6/site-packages/rest_framework/serializers.py" in run_validation 434. value = self.to_internal_value(data) File "/home/alex/.local/lib/python3.6/site-packages/rest_framework/serializers.py" in to_internal_value 491. validated_value = field.run_validation(primitive_value) File "/home/alex/.local/lib/python3.6/site-packages/rest_framework/fields.py" in run_validation 535. value = self.to_internal_value(data) File "/home/alex/.local/lib/python3.6/site-packages/djangoldp/serializers.py" in to_internal_value 34. return [self.child.to_internal_value(item) for item in data] File "/home/alex/.local/lib/python3.6/site-packages/djangoldp/serializers.py" in <listcomp> 34. return [self.child.to_internal_value(item) for item in data] Exception Type: AttributeError at /api/actiongroups/ Exception Value: 'ManyJsonLdRelatedField' object has no attribute 'child' ``` Sent JSON : ```json [ { "@id": "./", "http://happy-dev.fr/owl/#actiongroups": { "@id": "http://127.0.0.1:8000/api/actiongroups/1/" }, "http://happy-dev.fr/owl/#description": "Test ManyToMany association", "http://happy-dev.fr/owl/#frequency": { "@id": "http://127.0.0.1:8000/api/actiongroupfrequencys/1/" }, "http://happy-dev.fr/owl/#image": "https://www.fodors.com/wp-content/uploads/2018/07/shutterstock_552368572.jpg", "http://happy-dev.fr/owl/#kind": { "@id": "http://127.0.0.1:8000/api/actiongroupthemes/1/" }, "http://happy-dev.fr/owl/#objective": "Test ManyToMany association", "http://happy-dev.fr/owl/#place": "My laptop", "http://www.w3.org/2000/01/rdf-schema#label": "Test ManyToMany association" } ] ```