TypError: объект ManyRelatedManager не повторяется при связывании с целью переопределения поля создания и добавления сериализатора M2M - PullRequest
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TypError: объект ManyRelatedManager не повторяется при связывании с целью переопределения поля создания и добавления сериализатора M2M

0 голосов
/ 21 сентября 2019

Я пытаюсь переопределить DRF ModelSerializer, чтобы я мог передать ему список RemoteServer pk, и он создаст TaskTarget экземпляров с полем сервера, равным серверу.

Идеяэто то, что я мог бы отправить это на RemoteTaskSerializer: 

{
    // RemoteServer pk's
    targets: [1,2,3]
    // Rest of fields
    name: "Test"
}

И в итоге я получу три TaskTarget экземпляра в RemoteTask.target, первый из которых указывает на TaskTarget(server=RemoteServer.objects.get(pk=1)), и так далее.

Сериализатор, который дает мне проблемы: 

class RemoteTaskSerializer(serializers.ModelSerializer):
    targets = serializers.ListField(child=serializers.IntegerField())

    class Meta:
        model = RemoteTask
        fields = ("name", "targets", "id")

    def create(self, validated_data):
        server_ids = validated_data.pop('targets', [])
        remote_task = RemoteTask.objects.create(**validated_data)
        for pk in server_ids:
            t = TaskTarget(server=RemoteServer.objects.get(pk=pk))
            t.save()
            remote_task.targets.add(t)
        return remote_task

Модели: 

class RemoteTask(models.Model):
    name = models.CharField(max_length=120, unique=True)
    targets = models.ManyToManyField(TaskTarget)

class TaskTarget(models.Model):
    server = models.ForeignKey("RemoteServer", on_delete=models.CASCADE)
    output = models.TextField(null=True)
    huey_id = models.IntegerField(unique=True, null=True)

class RemoteServer(models.Model):
    name = models.CharField(max_length=120, unique=True)
    ip = models.GenericIPAddressField()
    port = models.PositiveIntegerField()

А вот полный возвратный след: 

    Traceback (most recent call last):
  File "/home/h/PycharmProjects//venv/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/home/h/PycharmProjects//venv/lib/python3.7/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/h/PycharmProjects//venv/lib/python3.7/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/h/PycharmProjects//venv/lib/python3.7/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "/home/h/PycharmProjects//venv/lib/python3.7/site-packages/django/views/generic/base.py", line 71, in view
    return self.dispatch(request, *args, **kwargs)
  File "/home/h/PycharmProjects//venv/lib/python3.7/site-packages/rest_framework/views.py", line 505, in dispatch
    response = self.handle_exception(exc)
  File "/home/h/PycharmProjects//venv/lib/python3.7/site-packages/rest_framework/views.py", line 465, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/home/h/PycharmProjects//venv/lib/python3.7/site-packages/rest_framework/views.py", line 476, in raise_uncaught_exception
    raise exc
  File "/home/h/PycharmProjects//venv/lib/python3.7/site-packages/rest_framework/views.py", line 502, in dispatch
    response = handler(request, *args, **kwargs)
  File "/home/h/PycharmProjects//backendapi/views.py", line 47, in post
    return self.create(request, *args, **kwargs)
  File "/home/h/PycharmProjects//venv/lib/python3.7/site-packages/rest_framework/mixins.py", line 20, in create
    headers = self.get_success_headers(serializer.data)
  File "/home/h/PycharmProjects//venv/lib/python3.7/site-packages/rest_framework/serializers.py", line 559, in data
    ret = super().data
  File "/home/h/PycharmProjects//venv/lib/python3.7/site-packages/rest_framework/serializers.py", line 261, in data
    self._data = self.to_representation(self.instance)
  File "/home/h/PycharmProjects//venv/lib/python3.7/site-packages/rest_framework/serializers.py", line 526, in to_representation
    ret[field.field_name] = field.to_representation(attribute)
  File "/home/h/PycharmProjects//venv/lib/python3.7/site-packages/rest_framework/fields.py", line 1660, in to_representation
    return [self.child.to_representation(item) if item is not None else None for item in data]
TypeError: 'ManyRelatedManager' object is not iterable
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