Styjun

I have a data like this.
enter image description here

model.py

from django.db import models


class Diet(models.Model):
 date = models.CharField(max_length=20)
 building = models.CharField(max_length=40)
 location = models.CharField(max_length=40)
 restaurants = models.ManyToManyField('Restaurant')

 def __str__(self):
 return self.building


class Restaurant(models.Model):
 name = models.CharField(max_length=40)
 menus = models.ManyToManyField('DietMenu')

 def __str__(self):
 return self.name


class DietMenu(models.Model):
 name = models.CharField(max_length=256)
 price = models.CharField(max_length=20)

 def __str__(self):
 return self.name

api.py

from .models import Diet
from .models import Restaurant
from .models import DietMenu
from rest_framework import serializers, viewsets


class DietMenuSerializer(serializers.ModelSerializer):
 class Meta:
 model = DietMenu
 fields = ('name', 'price')


class DietMenuViewSet(viewsets.ModelViewSet):
 queryset = DietMenu.objects.all()
 serializer_class = DietMenuSerializer


class RestaurantSerializer(serializers.ModelSerializer):
 menus = DietMenuSerializer(many=True, read_only=True)
 class Meta:
 model = Restaurant
 fields = ('name', 'menus')


class RestaurantViewSet(viewsets.ModelViewSet):
 queryset = Restaurant.objects.all()
 serializer_class = RestaurantSerializer


class DietSerializer(serializers.ModelSerializer):
 restaurants = RestaurantSerializer(many=True, read_only=True)
 class Meta:
 model = Diet
 fields = ('date', 'building', 'location', 'restaurants')


class DietViewSet(viewsets.ModelViewSet):
 queryset = Diet.objects.all()
 serializer_class = DietSerializer

And I get a json of the data like this.
enter image description here

import requests


class DjangoJson(object):
 def __init__(self):
 self.url = "url"

 def set_diet_date(self):
 self.url = "http://localhost:8000/api/v1/diet/?format=json"

 def get(self):
 self.set_diet_date()
 request = requests.get(self.url)
 document = request.json()
 return document

 def post(self, param):
 requests.post(self.url, json=param)


if __name__ == "__main__":
 json = DjangoJson()
 doc = json.get()[0]
 json.post(doc)

Then I POST this json by using the requests library. But the restaurant field is empty.
enter image description here

Is there an way to POST ManyToMany data with Json?
Thanks.