[英]How to make a field the same as int:pk in django rest framework?
我有一个序列化器
class AnswerQuestionsSerializer(serializers.ModelSerializer):
user = serializers.PrimaryKeyRelatedField(read_only=True, default=serializers.CurrentUserDefault())
class Meta:
model = Answer
fields = ('answer', 'user', 'question', 'number_of_points', 'moderate_status',)
和视图
class AnswerQuestions(generics.CreateAPIView, generics.GenericAPIView):
queryset = Answer.objects.all()
serializer_class = AnswerQuestionsSerializer
def perform_create(self, serializer):
return serializer.save(user=self.request.user)
def get_queryset(self):
return super().get_queryset().filter(
question_id=self.kwargs['pk']
)
model 看起来像这样
answer = models.TextField()
created_at = models.DateTimeField(editable=False, default=timezone.now)
updated_at = models.DateTimeField(default=timezone.now)
user = models.ForeignKey('users.CustomUser', on_delete=models.PROTECT)
question = models.ForeignKey('Question', on_delete=models.PROTECT)
number_of_points = models.IntegerField(default=0)
moderate_status = models.BooleanField(default=False)
url
path('answerQuestions/<int:pk>', AnswerQuestions.as_view()),
我将 url 设置为 answerQuestions/int:pk,所以当我使用发布请求时,可以说 answerQuestions/3 我仍然需要在正文中输入“question”:“3”,因为它不会自动读取它。 你知道如何让它自动点击 url 中提供的 id 的问题吗? 在这种情况下将是 3。
Internal Server Error: /api/v1/answerQuestions/3
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/core/handlers/exception.py", line 47, in inner
response = get_response(request)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/core/handlers/base.py", line 179, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
return view_func(*args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/views/generic/base.py", line 70, in view
return self.dispatch(request, *args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/rest_framework/views.py", line 509, in dispatch
response = self.handle_exception(exc)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/rest_framework/views.py", line 469, in handle_exception
self.raise_uncaught_exception(exc)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
raise exc
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/rest_framework/views.py", line 506, in dispatch
response = handler(request, *args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/rest_framework/generics.py", line 190, in post
return self.create(request, *args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/rest_framework/mixins.py", line 19, in create
self.perform_create(serializer)
File "/Users/jakubstrawa/programming/gitlabdeor/api/questions/views.py", line 16, in perform_create
return serializer.create(**self.perform_create_kwargs())
TypeError: create() got an unexpected keyword argument 'user'
您可以将问题标记为read_only=True
字段:
class AnswerQuestionsSerializer(serializers.ModelSerializer):
user = serializers.PrimaryKeyRelatedField(read_only=True, default=serializers.CurrentUserDefault())
question = serializers.PrimaryKeyRelatedField(read_only=True)
class Meta:
model = Answer
fields = ('answer', 'user', 'question', 'number_of_points', 'moderate_status',)
并在视图中将其注入序列化程序的create
方法中:
class AnswerQuestions(generics.CreateAPIView, generics.GenericAPIView):
queryset = Answer.objects.all()
serializer_class = AnswerQuestionsSerializer
def perform_create(self, serializer):
return serializer.save(user=self.request.user, question_id=self.kwargs['pk'])
def get_queryset(self):
return super().get_queryset().filter(
question_id=self.kwargs['pk']
)
您可以使用 mixin,例如:
class ParentKeyAPIView:
parent_url_pk = 'pk'
parent_model_field = None
def perform_create_kwargs(self, **kwargs):
kwargs[self.parent_model_field] = self.kwargs[self.parent_url_pk]
return kwargs
def perform_create(self, serializer):
return serializer.save(**self.perform_create_kwargs())
def get_queryset(self):
return super().get_queryset().filter(
**{self.parent_model_field: self.kwargs[self.parent_url_pk]}
)
然后你可以使用这样的mixin:
class AnswerQuestions(ParentKeyAPIView, generics.CreateAPIView):
model = Answer
parent_model_field = 'question_id'
serializer_class = AnswerQuestionsSerializer
def perform_create_kwargs(self, **kwargs):
return super().perform_create_kwargs(user=self.request.user, **kwargs)
然后,mixin 至少会同时处理过滤和object 的创建。
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