Inserting foreign key in django rest framework - django

Question

Here is the code that i am using for serializer
class CitySerializer(serializers.ModelSerializer):
addedBy = serializers.ReadOnlyField(source='addedBy.username')
country = CountrySerializer()
class Meta:
model = City
fields = ('id','name','slug','country','addedBy','createdAt')
class ActivitySerializer(serializers.ModelSerializer):
owner = serializers.ReadOnlyField(source='owner.username')
tag = ActivityTagSerializer()
location = CitySerializer()
class Meta:
model = Activity
fields = ('id','title','slug','description','location','tag','owner','createdAt')
i am able to insert data if i remove tag and location serializer by adding there pk in form but not with them being serialized. Here is the views that are being used
class ActivityList(generics.ListCreateAPIView):
queryset = Activity.objects.all()
serializer_class = ActivitySerializer
permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
def perform_create(self, serializer):
serializer.save(owner=self.request.user)
class ActivityDetail(generics.RetrieveUpdateDestroyAPIView):
queryset = Activity.objects.all()
serializer_class = ActivitySerializer
permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
The owner field is read-only so thats why had to create a separate insert for the same. Now here are the outputs from the two case , with and without reference to other serializer (tag and location) in ActivitySerializer
{
"id": 3,
"title": "sdfsdf",
"slug": "sdfsdf",
"description": "sdfsdfsdf",
"location": {
"id": 2,
"name": "goa",
"slug": "goa",
"country": {
"id": 1,
"name": "india",
"slug": "india",
"addedBy": "georoot",
"createdAt": "2016-06-17T05:56:30.099121Z"
},
"addedBy": "georoot",
"createdAt": "2016-06-17T06:01:12.771079Z"
},
"tag": {
"id": 3,
"title": "temp",
"slug": "temp",
"addedBy": "georoot",
"createdAt": "2016-06-17T06:03:44.647455Z"
},
"owner": "georoot",
"createdAt": "2016-06-17T06:24:50.006344Z"
}
This is with reference to serializer which is the output view that i want, but insert not working in this case
and this is without reference to the serializer
{
"id": 3,
"title": "sdfsdf",
"slug": "sdfsdf",
"description": "sdfsdfsdf",
"location": 2,
"tag": 3,
"owner": "georoot",
"createdAt": "2016-06-17T06:24:50.006344Z"
}
Here i can change the values of tag and location by passing in the pk.
How can i do the same while referencing to other serializer as in the previous output
EDIT
structure for models
class City(models.Model):
name = models.CharField(max_length=200)
slug = AutoSlugField(populate_from='name')
country = models.ForeignKey(Country)
addedBy = models.ForeignKey('auth.user')
createdAt = models.DateTimeField(auto_now_add=True, blank=True)
class Activity(models.Model):
owner = models.ForeignKey('auth.user')
title = models.CharField(max_length=200)
slug = AutoSlugField(populate_from='title')
description = models.TextField()
location = models.ForeignKey(City)
tag = models.ForeignKey(ActivityTag)
createdAt = models.DateTimeField(auto_now_add=True, blank=True)