OPTIONS does not use action specific serializers

[EmCeeEs]

Assume an app that manages information about countries:

from django.db import models from rest_framework import viewsets, serializers, routers class Country(models.Model): name = models.CharField(max_length=100) population = models.PositiveIntegerField() class CountrySerializer(serializers.ModelSerializer): class Meta: model = Country fields = "__all__" class CountryCreateSerializer(serializers.ModelSerializer): class Meta: model = Country fields = ("name",) class CountryViewSet(viewsets.ModelViewSet): queryset = Country.objects.all() serializer_class = CountrySerializer def get_serializer_class(self): if self.action == "create": return CountryCreateSerializer return super().get_serializer_class() router = routers.DefaultRouter() router.register(r"country", CountryViewSet) urlpatterns = router.urls

OPTIONS /country/

Expected Behavior

POST action reflects CountryCreateSerializer fields:

HTTP 200 OK Allow: GET, POST, HEAD, OPTIONS Content-Type: application/json Vary: Accept { "name": "Country List", "description": "", "renders": [ "application/json", "text/html" ], "parses": [ "application/json", "application/x-www-form-urlencoded", "multipart/form-data" ], "actions": { "POST": { "name": { "type": "string", "required": true, "read_only": false, "label": "Name", "max_length": 100 }, } } }

Actual Behavior

POST action reflects CountrySerializer fields:

HTTP 200 OK Allow: GET, POST, HEAD, OPTIONS Content-Type: application/json Vary: Accept { "name": "Country List", "description": "", "renders": [ "application/json", "text/html" ], "parses": [ "application/json", "application/x-www-form-urlencoded", "multipart/form-data" ], "actions": { "POST": { "id": { "type": "integer", "required": false, "read_only": true, "label": "ID" }, "name": { "type": "string", "required": true, "read_only": false, "label": "Name", "max_length": 100 }, "population": { "type": "integer", "required": true, "read_only": false, "label": "Population", "min_value": 0, "max_value": 2147483647 } } } }

Explanation / Resolution

SimpleMetadata.determine_actions should take the action specific serializers into account.

Current workaround

class DynamicSerializerMetadata(SimpleMetadata): def determine_actions(self, request, view): actions = {} for method in {"PUT", "POST"} & set(view.allowed_methods): view.request = clone_request(request, method) try: # Test global permissions if hasattr(view, "check_permissions"): view.check_permissions(view.request) # Test object permissions if method == "PUT" and hasattr(view, "get_object"): view.get_object() except (exceptions.APIException, PermissionDenied, Http404): pass else: # If user has appropriate permissions for the view, include # appropriate metadata about the fields that should be supplied. view.action = view.action_map.get(method.lower()) # <----- SET TO CORRECT ACTION BEFORE CALLING get_serializer serializer = view.get_serializer() view.action = "metadata" # <------ RESTORE actions[method] = self.get_serializer_info(serializer) finally: view.request = request return actions