I'm adding a 'tests' field to my 'Sample' model, where 'tests' will be a list of 'TestRequest' objects. Currently, I'm getting this error:
Got AttributeError when attempting to get a value for field `tests` on serializer `SampleSerializer`.The serializer field might be named incorrectly and not match any attribute or key on the `Sample` instance.Original exception text was: 'Sample' object has no attribute 'tests'.'tests' is not a field on my model. I'm just trying to add it to the serialized data. Currently, I can get a nested serializer to work for 'klass' but that is because it's defined in the model.
Models:
class Sample(models.Model): name = models.CharField(max_length=50, null=False, blank=False) comments = models.TextField(null=True, blank=True) klass = models.ForeignKey('samples.Batch', null=True, blank=True, related_name='samples', verbose_name='Batch') product = models.ForeignKey('customers.Product', blank=False) NOTRECEIVED = 'nr' RECEIVED = 'rc' DISCARDED = 'dc' DEPLETED = 'dp' SAMPLE_STATUS = ( (NOTRECEIVED, 'not received'), (RECEIVED, 'received'), (DISCARDED, 'discarded'), (DEPLETED, 'depleted'), ) status = models.CharField( max_length=2, choices=SAMPLE_STATUS, default=NOTRECEIVED) is_recycling = models.BooleanField(default=False) is_submitted = models.BooleanField(default=False) received_date = models.DateTimeField( _('date received'), null=True, blank=True)class TestRequest(models.Model): client = models.ForeignKey('customers.Client') company = models.ForeignKey('customers.Company') sample = models.ForeignKey('samples.Sample') procedure_version = models.ForeignKey('registery.ProcedureVersion') replicates = models.PositiveIntegerField(editable=True, null=True, blank=True) created_date = models.DateTimeField('Date created', auto_now_add=True) last_updated = models.DateTimeField(auto_now=True) comments = models.TextField('Comments', blank=True)Serializers:
class TestSerializer(serializers.ModelSerializer): href = serializers.HyperlinkedIdentityField(lookup_field='pk', lookup_url_kwarg='pk', read_only=True, view_name='samples_api:test-detail') class Meta: model = TestRequest fields = ('id', 'href',)class SampleBatchSerializer(serializers.ModelSerializer): href = serializers.HyperlinkedIdentityField( lookup_field='pk', lookup_url_kwarg='batch_pk', read_only=True, view_name='samples_api:batch-detail') class Meta: model = Batch fields = ('id', 'href',)class SampleSerializer(serializers.ModelSerializer): tests = TestSerializer(many=True) klass = SampleBatchSerializer(many=False) class Meta: model = Sample # list_serializer_class = FilteredListSerializer fields = ('id', 'name', 'tests', 'klass',) def create(self, validated_data): ... def update(self, instance, validated_data): ...Viewsets:
class TestRequestViewSet(viewsets.ModelViewSet):""" Viewset for the TestRequest model""" serializer_class = TestRequestSerializer def get_queryset(self): client = get_object_or_404(Client, user=self.request.user) return TestRequest.objects.filter(company=client.company) def perform_create(self, serializer): # Override default creatation to provide request based information. client = get_object_or_404(Client, user=self.request.user) company = client.company serializer.save(client=client, company=company)class SampleViewSet(viewsets.ModelViewSet):""" Viewset for the Sample model""" serializer_class = SampleSerializer def get_queryset(self): client = get_object_or_404(Client, user=self.request.user) return Sample.objects.filter(klass__company=client.company)I would rather not have to add the field to the model. A 'Sample' can have many 'TestRequest's but a 'TestRequest' can only have one 'Sample'.
How do I get my serializer to add the 'tests' field that isn't in the model?