Django POST request issue with model - django

Question

I have a model Condition that has a field symptoms, which takes multiple different Symptoms objects. Whenever, I make a POST request to create a Condition object, I get the following error:
'Condition: epilepsy' needs to have a value for field "condition" before this many-to-many relationship can be used.
The above 'Condition: epilepsy' is nested between <>, but theres a formatting issue with posting that.
Here is my Condition model:
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 )
Here is my 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')
Here is the Manager
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
And here is the View
#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)
Traceback (most recent call last):
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
traceback from #snakefcz 's answer
Internal Server Error: /conditions/new/condition/
Traceback (most recent call last):
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 45, in create_condition
return response.Response(serializer.data, status=201)
File "/Library/Python/2.7/site-packages/rest_framework/serializers.py", line 527, in data
ret = super(Serializer, self).data
File "/Library/Python/2.7/site-packages/rest_framework/serializers.py", line 262, in data
self._data = self.to_representation(self.instance)
File "/Library/Python/2.7/site-packages/rest_framework/serializers.py", line 496, in to_representation
ret[field.field_name] = field.to_representation(attribute)
File "/Library/Python/2.7/site-packages/rest_framework/serializers.py", line 643, in to_representation
self.child.to_representation(item) for item in iterable
File "/Library/Python/2.7/site-packages/rest_framework/serializers.py", line 479, in to_representation
fields = self._readable_fields
File "/Library/Python/2.7/site-packages/django/utils/functional.py", line 35, in get
res = instance.dict[self.name] = self.func(instance)
File "/Library/Python/2.7/site-packages/rest_framework/serializers.py", line 373, in _readable_fields
field for field in self.fields.values()
File "/Library/Python/2.7/site-packages/rest_framework/serializers.py", line 359, in fields
for key, value in self.get_fields().items():
File "/Library/Python/2.7/site-packages/rest_framework/serializers.py", line 1010, in get_fields
fields[field_name] = field_class(**field_kwargs)
File "/Library/Python/2.7/site-packages/rest_framework/fields.py", line 733, in init
super(CharField, self).init(**kwargs)
TypeError: init() got an unexpected keyword argument 'view_name'

Answer 1

You'll need to create a Symptom serializer in addition to the Condition one. Your ConditionSerializer should look something like:
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)