Сериализатор Django REST FRAMEWORK со вложенным сериализатором ⇐ Python

[Anonymous]

У меня возникла проблема с добавлением сериализатора к другому сериализатору и правильным его вызовом.
Мой models.py только с моделью WorkshopMaterials р>

Код: Выделить всё

class WorkshopMaterials(models.Model):
id = models.BigAutoField(primary_key=True)
workshop = models.ForeignKey(Workshop, on_delete=models.CASCADE, related_name="workshop")
material = models.ForeignKey(Material, on_delete=models.CASCADE, related_name="material")
amount = models.IntegerField(blank=False, default=1)
amountType = models.CharField(
max_length=3,
choices=AmountType.choices,
default=AmountType.PCT,
blank=False
)

Мой serializer.py

Код: Выделить всё

class MaterialSerializer(ModelSerializer):
class Meta:
model = Material
fields = ('id', 'name', 'amount', 'amountType', 'link', 'status')
extra_kwargs = {'id': {'read_only': True}}

class WorkshopMaterialsSerializer(ModelSerializer):
class Meta:
model = WorkshopMaterials
fields = ('amount', 'amountType', 'material', 'workshop')

def to_representation(self, instance):
rep = super().to_representation(instance)
rep["material"] = MaterialSerializer(instance.material).data["name"]
rep["workshop"] = WorkshopSerializer(instance.workshop).data["id"]

return rep

class WorkshopSerializer(ModelSerializer):
class Meta:
model = Workshop
exclude = ['created_at', 'updated_at']

def __init__(self, *args, **kwargs):
fields = kwargs.pop('fields', None)

super().__init__(*args, **kwargs)

if fields is not None:
allowed = set(fields)
existing = set(self.fields)
for field_name in existing - allowed:
self.fields.pop(field_name)

def to_representation(self, instance):
rep = super().to_representation(instance)

workshopLeaderData = WorkshopLeaderSerializer(instance.leader).data
workshopLeaderName = workshopLeaderData["name"]
if workshopLeaderData["displayname"] == "AN":
workshopLeaderName = workshopLeaderData["artistname"]

rep["leader"] = workshopLeaderName

return rep

Мой views.py

Код: Выделить всё

class WorkshopListView(APIView):
#permission_classes = (IsAuthenticated,)

def get(self, request):
### TESTED MATERIALS FOR DIFFERENT WORKSHOPS
#workshop = WorkshopMaterials.objects.prefetch_related(Prefetch('workshop', queryset=Workshop.objects.filter(id=3)))
#serializer = WorkshopMaterialsSerializer(workshop, many=True)

### WORKING FOR LIST VIEW (NO DETAILS)
#workshops = Workshop.objects.prefetch_related('workshop').all()
#serializer = WorkshopSerializer(workshops, many=True, fields=('id', 'leader', 'title', 'categorie', 'language'))

### NOW TRY TO GET A FULL LIST WITH ALL WORKSHOP FIELDS AND ALL MATERIAL FOR THOSE
### CURRENTLY FAILING HERE.
workshops = Workshop.objects.prefetch_related('workshop').all()
serializer = WorkshopSerializer(workshops, many=True)

return JsonResponse(serializer.data, safe=False)

def post(self, request):
return JsonResponse({'detail': 'WIP'}, status=400)

Мой текущий вывод в формате JSON:

Код: Выделить всё

[{
"id": 3,
"title": "SPECIAL TITLE",
"description": "SOME TEXT FOR DESC",
"categorie": "OTH",
"language": "EN",
"duration": "1H",
"needs_tables": true,
"participants": "XS",
"custom_participants": 1,
"daytime": "ANYT",
"repeats": "NOREPEAT",
"location": "BACKLOG",
"own_material": "",
"additional_infos": "",
"costs_currency": "EUR",
"costs": "0.00",
"cost_description": "",
"leader": "COOL LEADER"
}]

Мой желаемый результат в формате JSON:

Код: Выделить всё

[{
"id": 3,
"title": "SPECIAL TITLE",
"description":  "SOME TEXT FOR DESC",
"categorie": "OTH",
"language": "EN",
"duration": "1H",
"needs_tables": true,
"participants": "XS",
"custom_participants": 1,
"daytime": "ANYT",
"repeats": "NOREPEAT",
"location": "BACKLOG",
"own_material": "",
"additional_infos": "",
"costs_currency": "EUR",
"costs": "0.00",
"cost_description": "",
"leader": "COOL LEADER",
"material": [
{
id: 1,
name: "Material 1",
},
{
id: 2,
name: "Material 2",
},
{
id: 3,
name: "Material 3",
}
}
}]

Как я могу использовать мой WorkshopMaterialsSerializer для работы с моим WorkshopSerializer, чтобы получить желаемый результат? И как я могу справиться с этим с точки зрения производительности? В настоящее время я пытаюсь выполнить предварительную выборку

Подробнее здесь: https://stackoverflow.com/questions/785 ... serializer