Serializing joined tables in serializers rest framework - django

Question

So i am trying to serialize multiple joined tables with django serializers. I cant find a way to do this. The query being executed is raw sql.
The models are as below
class UserDetail(models.Model):
user = models.OneToOneField(User, on_delete = models.CASCADE)
mobile_number = models.IntegerField()
national_id = models.CharField(max_length = 30)
date_created = models.DateTimeField(auto_now_add = True)
address = models.CharField(max_length = 250)
merchant_name = models.CharField(null = True, max_length = 30)
class Account(models.Model):
user = models.OneToOneField(User, on_delete = models.CASCADE)
account_number = models.BigIntegerField()
balance = models.FloatField()
account_type = models.ForeignKey(AccountType, on_delete = models.CASCADE)
The json for the expected result should as below
{
"userdetail": {
"mobile_number":""
},
"account": {
"account_number":""
},
"user": {
"first_name": "",
"last_name": "",
"email":""
}
}
The raw sql query is as below
queryset = Account.objects.raw('''SELECT auth_user.first_name,
auth_user.id,
auth_user.last_name,
auth_user.email,
authentication_userdetail.mobile_number,
authentication_account.account_number
FROM
public.auth_user,
public.authentication_account,
public.authentication_userdetail
WHERE
auth_user.id = authentication_userdetail.user_id
AND
auth_user.id = authentication_account.user_id
''')
If there is an alternative way to do this without using raw sql i would greatly appreciate it as im not a fan of executing raw sql queries with django ORM
Tried working with this solution but i cant seem to understand the way the queryset was serialized
Cross-table serialization Django REST Framework
Edited
class UserDetailSerializer(serializers.ModelSerializer):
class Meta:
model = UserDetail
fields = ('mobile_number',)
class AccountSerializer(serializers.ModelSerializer):
class Meta:
model = Account
fields = ('account_number',)
class AccountInfoSerializer(serializers.ModelSerializer):
user_detail = UserDetailSerializer()
account = AccountSerializer()
user = serializers.SerializerMethodField()
class Meta:
model = User
fields = ('user_detail', 'account', 'user')
def get_user(self, obj):
return {
'first_name': 'obj.first_name',
'last_name': 'obj.last_name',
'email': 'obj.email',
}
Code for the view
serializer_class = AccountInfoSerializer
def get_queryset(self, *args, ** kwargs):
user_id = self.request.query_params.get('user_id', None)
queryset = None
if user_id is not '':
queryset = UserDetail.objects.raw()
return queryset

Answer 1

you can try such solution:
from rest_framework import serializers
class UserDetailSerializer(serializers.ModelSerializer):
class Meta:
model = UserDetail
fields = ('mobile_number',)
class AccountSerializer(serializers.ModelSerializer):
class Meta:
model = Account
fields = ('account_number',)
class UserSerializer(serializers.ModelSerializer):
userdetail = UserDetailSerializer()
account = AccountSerializer()
user = serializers.SerializerMethodField()
class Meta:
model = User
fields = ('userdetail', 'account', 'user')
def get_user(self, obj):
return {
'first_name': 'obj.first_name',
'last_name': 'obj.last_name',
'email': 'obj.email',
}