Writable nested serializer method getting an Error while posting a request - django

Question

models.py
class Client(models.Model):
client_id = models.AutoField(unique=True, primary_key=True)
org = models.ForeignKey(Organisation, on_delete=models.CASCADE, related_name='org',null=True)
product = models.ManyToManyField(Product,related_name='product')
client_name = models.CharField(max_length=100)
client_code = models.CharField(max_length=20)
client_logo = models.ImageField(upload_to=upload_to,storage=DownloadableS3Boto3Storage, null=True, blank=True)
currency = MoneyField(max_digits=10, decimal_places=2, default_currency='INR', null=True)
billing_method = models.CharField(max_length=40)
first_name = models.CharField(max_length=20)
last_name = models.CharField(max_length=20)
email_id = models.EmailField(max_length=100)
contact_no = models.CharField(max_length=20)
mobile_no = models.CharField(max_length=20)
description = models.TextField(max_length=500)
street_address = models.CharField(max_length=250)
city = models.CharField(max_length=50)
state = models.CharField(max_length=50)
country = models.CharField(max_length=50)
pincode = models.CharField(max_length=10)
industry = models.CharField(max_length=100)
company_size = models.IntegerField()
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
is_active = models.IntegerField(default=0, choices=STATUS_CHOICES)
class Meta:
db_table = "client_master"
def __str__(self):
return self.client_name
serializers.py
class Client_Serializers(serializers.ModelSerializer):
#product_name = Product_Serializers(many=True)
product = Product_Serializers(many=True)
class Meta:
model = Client
fields = ('client_id','currency','billing_method','first_name','last_name','description','street_address','city','state','country','pincode','industry','company_size','client_name', 'contact_no','mobile_no', 'email_id','client_logo','client_code','product',)
def create(self, validated_data):
products_data = validated_data.pop('product')
product = Product.objects.create(**validated_data)
for product_data in products_data:
Product.objects.create(product=product, **product_data)
return product
Data receiving on GET method
{
"client_id": 3,
"currency": "0.05",
"billing_method": "credit card",
"first_name": "career",
"last_name": "lab",
"description": "NA",
"street_address": "tiliconveli",
"city": "tirunelveli",
"state": "tamilnadu",
"country": "India",
"pincode": "600200",
"industry": "software",
"company_size": 100,
"client_name": "techfetch",
"contact_no": "1234567890",
"mobile_no": "1234567890",
"email_id": "icanio#gamil.com",
"client_logo": "https://icanio-project-management.s3.amazonaws.com/client_logo/sup_bat_fDauRxK.jpg",
"client_code": "TFH",
"product": [
{
"product_id": 5,
"product_name": "time"
}
]
}
But while posting it in the same format it is not getting posted, showing like
{
"status": "error",
"code": 400,
"data": {
"product": [
"This field is required."
]
},
"message": "success"
}
Views.py for reference
class Client_Viewset(DestroyWithPayloadMixin,viewsets.ModelViewSet):
renderer_classes = (CustomRenderer, )
queryset=models.Client.objects.all()
serializer_class=serializers.Client_Serializers
parser_classes = [MultiPartParser, FormParser]
filter_fields = (
'client_id',
'client_name',
'client_code',
'org_id',
)
How can I post the same data which I get in the GET request of Product field. Please help me resolve this as I was stuck in there for two days. I tried so many ways and end up not getting posted.
Product model
class Product(models.Model):
product_id = models.AutoField(unique=True, primary_key=True)
product_name = models.CharField(max_length=255)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
class Meta:
db_table = "product_master"
def __str__(self):
return self.product_name
product serializer
class Product_Serializers(serializers.ModelSerializer):
class Meta:
model = Product
fields = ('product_id','product_name',)

Answer 1

From your code, the Client_Serializers is for Client model but the create method is not creating any Client object.
Client_Serializers should be something on these lines -
class Client_Serializers(serializers.ModelSerializer):
product = Product_Serializers(many=True)
class Meta:
model = Client
fields = ('client_id','currency','billing_method','first_name','last_name','description','street_address','city','state','country','pincode','industry','company_size','client_name', 'contact_no','mobile_no', 'email_id','client_logo','client_code','product',)
def create(self, validated_data):
products_data = validated_data.pop('product')
client = Client.objects.create(**validated_data) # Create a client object
for product_data in products_data:
Product.objects.create(client=client, **product_data)
return client