Nested serializers in drf throws error with one to one field - django

Question

My input json is :
{
"availability": "Current",
"drive_type": [{
"drive_name": "drive1",
"requirements": {
"performance_unit": "by_iops",
}
}]
}
I am getting error Cannot assign "
OrderedDict([('performance_unit', 'Basic')])":
"DriveType.requirements" must be a "Requirements" instance
.I am not able to figure it out to map in create method for one to one fields in tables
Below are my models.py
class ProductLine(models.Model):
availability = models.CharField(max_length=20, blank=True, null=True)
class Meta:
db_table = "product_line"
class DriveType(models.Model):
drive_name = models.CharField(max_length=20, blank=True, null=True)
product_line = models.ForeignKey(ProductLine, related_name="drive_type")
class Meta:
db_table = "drive_type"
class Requirements(models.Model):
performance_unit = models.CharField(max_length=100, blank=True, null=True)
drive_type = models.OneToOneField(DriveType,on_delete=models.CASCADE,primary_key=True,related_name="requirements")
class Meta:
db_table = "requirements"
Serializers.py :
class DriveTypeSerializer(serializers.ModelSerializer):
requirements = RequirementsSerializer(many = True)
class Meta:
model = DriveType
fields = (
"drive_name","workload_type")
class ProductLineSerializer(serializers.ModelSerializer):
drive_type = DriveTypeSerializer(many=True)
class Meta:
model = ProductLine
fields = ('availability', "drive_type")
def create(self, validated_data):
print("validate_data",validated_data)
drive_type_data = validated_data.pop("drive_type")
product_line = ProductLine.objects.create(**validated_data)
for drive_data in drive_type_data:
drive_type = DriveType.objects.create(product_line=product_line, **drive_data)
return product_line

Answer 1

You have one to one relationship of DriveType and Requirements
So remove many = True from DriveTypeSerializer for RequirementsSerializer
class DriveTypeSerializer(serializers.ModelSerializer):
requirements = RequirementsSerializer()
class Meta:
model = DriveType
fields = ("drive_name","workload_type")
Your input json has only one object of requirements not a list