DRF: Creating mixin using different serializers & objects - django

Question

I have two APIView classes with almost similar behaviour (and code). Different are only serializers and models object (Favorite & FavoriteSerializer for first class and PurchaseList and PurchaseListSerializer for second). As far as I understand it is a perfect usecase for mixin, according to DRF docs ([DRF: Creating custom mixins] 1https://www.django-rest-framework.org/api-guide/generic-views/).
Unfortunately, I'm struggling with how to define mixin without the definition of serializer & obj in it.
class FavoriteViewSet(APIView):
def get(self, request, recipe_id):
user = request.user.id
data = {"user": user, "recipe": recipe_id}
serializer = FavoriteSerializer(
data=data,
context={"request": request},
)
serializer.is_valid(raise_exception=True)
serializer.save()
return Response(serializer.data, status.HTTP_201_CREATED)
def delete(self, request, recipe_id):
user = request.user
favorite_recipe = get_object_or_404(
Favorite, user=user, recipe__id=recipe_id
)
favorite_recipe.delete()
return Response(
"Рецепт удален из избранного", status.HTTP_204_NO_CONTENT
)
class PurchaseListView(APIView):
def get(self, request, recipe_id):
user = request.user.id
data = {"user": user, "recipe": recipe_id}
serializer = PurchaseListSerializer(
data=data, context={"request": request}
)
serializer.is_valid(raise_exception=True)
serializer.save()
return Response(serializer.data, status.HTTP_201_CREATED)
def delete(self, request, recipe_id):
user = request.user
purchase_list_recipe = get_object_or_404(
PurchaseList, user=user, recipe__id=recipe_id
)
purchase_list_recipe.delete()
return Response(
"Рецепт удален из списка покупок", status.HTTP_204_NO_CONTENT
)

Answer 1

You can create your own mixin like this:
class CustomMixin:
serializer_class = None
model_class = None
def get(self, request, recipe_id):
user = request.user.id
data = {"user": user, "recipe": recipe_id}
serializer = self.serializer_class(
data=data,
context={"request": request},
)
serializer.is_valid(raise_exception=True)
serializer.save()
return Response(serializer.data, status.HTTP_201_CREATED)
def delete(self, request, recipe_id):
user = request.user
obj = get_object_or_404(
self.model_class, user=user, recipe__id=recipe_id
)
obj.delete()
return Response(
"Рецепт удален из избранного", status.HTTP_204_NO_CONTENT
)
class FavoriteViewSet(CustomMixin, APIView):
serializer_class = FavoriteSerializer
model_class = Favorite
class PurchaseListView(CustomMixin, APIView):
serializer_class = PurchaseListSerializer
model_class = PurchaseList
Or use the GenericApiView with the bulti-in mixins
https://www.django-rest-framework.org/api-guide/generic-views/#genericapiview