Question

我的模型Condition有一个字段symptoms，它带有多个不同的Symptoms个对象。每当我发出POST请求来创建一个Condition对象时，我都会收到以下错误：

'条件：癫痫'需要具有字段“条件”的值才能使用这种多对多关系。

以上'条件：癫痫'嵌套在＆lt;＆gt;之间，但是发布格式有问题。

这是我的条件模型：

class Condition(models.Model):
class Treatment():
    SURGERY, NON_INVASIVE, PRESCRIPTION_MEDICINE, NONE = range(4)
    CHOICES = (
        (SURGERY, 'Surgery'),
        (NON_INVASIVE, 'Non-Invasive Treatment'),
        (PRESCRIPTION_MEDICINE, 'Prescription Medicine'),
        (NONE, 'None')
        )
class Medicalfield(models.Model):
    ONCOLOGY, CARDIOLOGY, NEPHROLOGY, PEDIATRICS, ENDOCRONOLOGY, PSYCHOLOGY = range(6)
    CHOICES = (
        (ONCOLOGY, 'Oncology'),
        (CARDIOLOGY, 'Cardiology'),
        (NEPHROLOGY, 'Nephrology'),
        (PEDIATRICS, 'Pediatrics'),
        (ENDOCRONOLOGY, 'Endocronology'),
        (PSYCHOLOGY, 'Psychology')
        )

name = models.CharField(max_length=200)
contagious = models.BooleanField()
treatable = models.BooleanField()
treatment = models.IntegerField(choices=Treatment.CHOICES, null=True)
severeity = models.IntegerField(default=0)
symptoms = models.ManyToManyField('Symptom', blank=True)
medicalfield = models.IntegerField(choices=Medicalfield.CHOICES, null=True)

new = ConditionManager()

def __unicode__(self):
    return u"%s" % ( self.name )

这是我的Serializer

class ConditionSerializer(serializers.ModelSerializer):

def create(self, validated_data):
attrs = validated_data
request = self.context['request']
return Condition.new.create_condition(**attrs)

class Meta:
model = Condition
fields = ('id', 'treatment', 'name', 'contagious', 'treatable', 'treatment', 'severeity', 'symptoms', 'medicalfield')

这是经理

class ConditionManager(models.Manager):
use_in_migrations = True
use_for_related_fields=True

def create_condition(self, *args, **kwargs):
    condition_obj = conditions.models.Condition(name=kwargs['name'], contagious=kwargs['contagious'], treatable=kwargs['treatable'], treatment=kwargs['treatment'], severeity=kwargs['severeity'], symptoms=kwargs['symptoms'], medicalfield=kwargs['medicalfield'])
    condition_obj.save()
    return condition_obj

这是视图

@api_view(['POST'])
@permission_classes((AllowAny, ))
def create_condition(request):
context = {'request': request}
symptoms = request.data['symptoms']
symptoms = Symptom.objects.filter(name__in=symptoms)
s = []
for symptom in symptoms:
    s.append(symptom.pk)
request.data['symptoms'] = s

serializer = ConditionSerializer(data=request.data, context=context)
if serializer.is_valid():
    serializer.save()
    return response.Response(serializer.data, status=201)
return response.Response(serializer.errors, status=400)

追踪（最近一次呼叫最后一次）：

File "/Library/Python/2.7/site-packages/django/core/handlers/exception.py", line 39, in inner
response = get_response(request)
File "/Library/Python/2.7/site-packages/django/core/handlers/base.py", line 187, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/Library/Python/2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Library/Python/2.7/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view
return view_func(*args, **kwargs)
File "/Library/Python/2.7/site-packages/django/views/generic/base.py", line 68, in view
return self.dispatch(request, *args, **kwargs)
File "/Library/Python/2.7/site-packages/rest_framework/views.py", line 477, in dispatch
response = self.handle_exception(exc)
File "/Library/Python/2.7/site-packages/rest_framework/views.py", line 437, in handle_exception
self.raise_uncaught_exception(exc)
File "/Library/Python/2.7/site-packages/rest_framework/views.py", line 474, in dispatch
response = handler(request, *args, **kwargs)
File "/Library/Python/2.7/site-packages/rest_framework/decorators.py", line 52, in handler
return func(*args, **kwargs)
File "/Users/user/medicalrecords/conditions/views.py", line 28, in create_condition
serializer.save()
File "/Library/Python/2.7/site-packages/rest_framework/serializers.py", line 214, in save
self.instance = self.create(validated_data)
File "/Users/user/medicalrecords/conditions/serializers.py", line 24, in create
return Condition.new.create_condition(**attrs)
File "/Users/user/medicalrecords/conditions/managers.py", line 17, in create_condition
condition_obj = conditions.models.Condition(name=kwargs['name'], contagious=kwargs['contagious'], treatable=kwargs['treatable'], treatment=kwargs['treatment'], severeity=kwargs['severeity'], symptoms=kwargs['symptoms'], medicalfield=kwargs['medicalfield'])
File "/Library/Python/2.7/site-packages/django/db/models/base.py", line 550, in __init__
setattr(self, prop, kwargs[prop])
File "/Library/Python/2.7/site-packages/django/db/models/fields/related_descriptors.py", line 499, in __set__
manager = self.__get__(instance)
File "/Library/Python/2.7/site-packages/django/db/models/fields/related_descriptors.py", line 476, in __get__
return self.related_manager_cls(instance)
File "/Library/Python/2.7/site-packages/django/db/models/fields/related_descriptors.py", line 783, in __init__
(instance, self.source_field_name))
ValueError: "<Condition: epilepsy>" needs to have a value for field "condition" before this many-to-many relationship can be used.
[22/Feb/2017 20:01:45] "POST /conditions/new/condition/ HTTP/1.1" 500 15799

来自@snakefcz回答的追溯

内部服务器错误：/ conditions / new / condition / Traceback（最近一次调用最后一次）：文件“/Library/Python/2.7/site-packages/django/core/handlers/exception.py”，第39行，内部 response = get_response（request）在_get_response中输入文件“/Library/Python/2.7/site-packages/django/core/handlers/base.py”，第187行 response = self.process_exception_by_middleware（e，request）在_get_response中输入文件“/Library/Python/2.7/site-packages/django/core/handlers/base.py”，第185行 response = wrapped_callback（request，* callback_args，** callback_kwargs）在wrapped_view中输入文件“/Library/Python/2.7/site-packages/django/views/decorators/csrf.py”，第58行 return view_func（* args，** kwargs）文件“/Library/Python/2.7/site-packages/django/views/generic/base.py”，第68行，在视图中 return self.dispatch（request，* args，** kwargs）发送文件“/Library/Python/2.7/site-packages/rest_framework/views.py”，第477行 response = self.handle_exception（exc）在handle_exception中输入文件“/Library/Python/2.7/site-packages/rest_framework/views.py”，第437行 self.raise_uncaught_exception（EXC）发送文件“/Library/Python/2.7/site-packages/rest_framework/views.py”，第474行 response = handler（request，* args，** kwargs）文件“/Library/Python/2.7/site-packages/rest_framework/decorators.py”，第52行，处理程序 return func（* args，** kwargs）在create_condition中的文件“/Users/user/medicalrecords/conditions/views.py”，第45行 return response.Response（serializer.data，status = 201）文件“/Library/Python/2.7/site-packages/rest_framework/serializers.py”，第527行，数据 ret = super（Serializer，self）.data 文件“/Library/Python/2.7/site-packages/rest_framework/serializers.py”，第262行，数据 self._data = self.to_representation（self.instance）文件“/Library/Python/2.7/site-packages/rest_framework/serializers.py”，第496行，在to_representation中 ret [field.field_name] = field.to_representation（属性）文件“/Library/Python/2.7/site-packages/rest_framework/serializers.py”，第643行，在to_representation中 self.child.to_representation（item）for iterable中的item 文件“/Library/Python/2.7/site-packages/rest_framework/serializers.py”，第479行，在to_representation中 fields = self._readable_fields 文件“/Library/Python/2.7/site-packages/django/utils/functional.py”，第35行，获取 res = instance。 dict [self.name] = self.func（instance）在_readable_fields中输入文件“/Library/Python/2.7/site-packages/rest_framework/serializers.py”，第373行 self.fields.values（）中字段的字段在字段中输入文件“/Library/Python/2.7/site-packages/rest_framework/serializers.py”，第359行 for key，self.get_fields（）。items（）中的值：在get_fields中输入文件“/Library/Python/2.7/site-packages/rest_framework/serializers.py”，第1010行 fields [field_name] = field_class（** field_kwargs）在 init 中输入文件“/Library/Python/2.7/site-packages/rest_framework/fields.py”，第733行 super（CharField，self）。 init （** kwargs） TypeError： init （）得到了一个意外的关键字参数'view_name'

Answer 1

除了Symptom之外，您还需要创建Condition序列化程序。您的ConditionSerializer应该类似于：

class ConditionSerializer(serializers.ModelSerializer):
  symptoms = SymptomSerializer(read_only=True, many=True, allow_null=True)
  class Meta:
    model = Condition
    fields = ('id', 'treatment', 'name', 'contagious', 'treatable', 'treatment', 'severeity', 'symptoms', 'medicalfield')

  def create(self, validated_data):
    attrs = validated_data
    request = self.context['request']
    return Condition.new.create_condition(**attrs)

Answer 2

## Try it 
@api_view(['POST'])
    @permission_classes((AllowAny, ))
    def create_condition(request):
        context = {'request': request}
        serializer = ConditionSerializer(data=request.data, context=context)
        if serializer.is_valid():
           condition = serializer.save()
           symptoms = request.data['symptoms']
           for symp in symptoms:
               symptom = Symptom.objects.get(id=symp) ## if it's id's you are passing
               condition.symptoms.add(symptom)

           return response.Response(serializer.data, status=201)
    return response.Response(serializer.errors, status=400)

模型

2 个答案: