json - How to serialize relation -

try post json api serializer:

from rest_framework import serializers models import order, orderproduct, delivery, payments  class deliveryserializer(serializers.modelserializer):     class meta:         model = delivery         fields = ('delivery_time','delivery_adress','phone')#'id',      def create(self, validated_data):         """         create , return new `snippet` instance, given validated data.         """         return delivery.objects.create(**validated_data)      class paymentsserializer(serializers.modelserializer):     class meta:         model = payments         #fields = (title) #'id',     def create(self, validated_data):         """         create , return new `snippet` instance, given validated data.         """         return payments.objects.create(**validated_data)       class orderserializer(serializers.modelserializer):      delivery = deliveryserializer(required=false, allow_null=true)     paymentmethod = paymentsserializer(required=false, allow_null=true)     class meta:         model = order         fields = ( 'delivery', 'paymentmethod','summ','success') #'id',      def create(self, validated_data):         deliverys_data = validated_data.pop('delivery')         paymentsmethod_data = validated_data.pop('paymentmethod')         order = order.objects.create(**validated_data)           delivery.objects.create(order=order,**deliverys_data)         payments.objects.create(order=order,**paymentsmethod_data)         return order    

view:

api_view(['post']) def order_post(request, format=none)      if request.method == 'post':         serializer = orderserializer(data=request.data)         if serializer.is_valid():             serializer.save()             return response(serializer.data, status=status.http_201_created)         return response(serializer.errors, status=status.http_400_bad_request) 

when 1 try put order in database :

return database.cursor.execute(self, query, params) integrityerror: order_order.delivery_id may not null 

i try remove id fields, add id fields, result same.

json:

{"delivery":{"delivery_time":"2016-05-31t12:18:47z","delivery_adress":"123","phone":"123"},"paymentmethod":{"id":1,"title":"123124123"},"summ":"23","success":false} 

or

{"delivery":{"id":"1","delivery_time":"2016-05-31t12:18:47z","delivery_adress":"123","phone":"123"},"paymentmethod":{"id":"1","title":"123124123"},"summ":"23","success":false} 

upd1. models:

from __future__ import unicode_literals  django.db import models  # create models here. class order (models.model):     id = models.autofield(primary_key=true)     date_create = models.datefield(auto_now_add=true)     date_change = models.datefield(auto_now=true)     summ =models.charfield(max_length=15,default='0')     delivery = models.foreignkey('delivery')     success = models.booleanfield(default=false)     paymentmethod = models.foreignkey('payments')     def __unicode__(self):         return unicode(self.id)  class orderproduct(models.model):     order=models.foreignkey('order')     id = models.autofield(primary_key=true)     date_create = models.datefield(auto_now_add=true)     date_change = models.datefield(auto_now=true)     price = models.integerfield()     product = models.foreignkey('product.product')     additionals = models.integerfield(null=true,default=0)     count = models.integerfield()     def __unicode__(self):             return self.id   class delivery(models.model):     id = models.autofield(primary_key=true)     date_create = models.datefield(auto_now_add=true)     date_change = models.datefield(auto_now=true)     delivery_time = models.datetimefield()     delivery_adress = models.textfield()     phone = models.textfield()     def __unicode__(self):             return self.phone  class payments(models.model):     id = models.autofield(primary_key=true)     date_create = models.datefield(auto_now_add=true)     date_change = models.datefield(auto_now=true)     title = models.textfield();     def __unicode__(self):             return self.title              

you doing object creations in wrong order, that's why integrityerror: order_order.delivery_id may not null. check model structures again:

your order models has foreignkey's delivery , payments, means need create delivery , payments objects before order.

try this:

def create(self, validated_data):     deliverys_data = validated_data.pop('delivery')     delivery = delivery.objects.create(**deliverys_data)      paymentsmethod_data = validated_data.pop('paymentmethod')     payment_method = payments.objects.create(**paymentsmethod_data)      order = order.objects.create(         delivery=delivery,         paymentmethod=payment_method,         **validated_data     )      return order