DRF nested serializer - object has no attribute - django-rest-framework

Question

I am a newbie with django rest framework and python. and it is first time I asking a question here. thanks for helps from now..
--------------my models
class defined_views(models.Model):
name = models.CharField(max_length=150)
class defined_permissions(models.Model):
name = models.CharField(max_length=150)
class menuler(models.Model):
adi= models.CharField(max_length=150, null=True)
sira= models.PositiveIntegerField(null=True, blank=True)
parentId= models.ForeignKey('self', null=True, on_delete=models.CASCADE)
viewId= models.ForeignKey(defined_views, null=True, on_delete=models.CASCADE)
menu_type= models.CharField(max_length=150, null=True)
class user_menu_permission(models.Model):
userId = models.ForeignKey(User, null=False, on_delete=models.CASCADE)
menuID = models.ForeignKey(menuler, null=False, on_delete=models.CASCADE)
permissionID = models.ForeignKey(defined_permissions, null=True, on_delete=models.CASCADE)
-------------------serializer
class menulerSerializer(serializers.ModelSerializer):
class Meta:
model = menuler
fields = ['id', 'adi', 'sira', 'parentId', 'viewId', 'menu_type']
class user_menu_permissionSerializer(serializers.ModelSerializer):
menu = menulerSerializer()
class Meta:
model = user_menu_permission
fields = ['menuID', 'permissionID', 'menu']
class UserSerializer(serializers.ModelSerializer):
menuler = user_menu_permissionSerializer(
source='user_menu_permission_set', many=True)
class Meta:
model = User
fields = ['id', 'username', 'menuler']
------------------and view
class userView(APIView):
def get(self, request):
queryset = User.objects.all()
serializer = UserSerializer(queryset, many=True)
return Response(serializer.data)
I get this errror
"Got AttributeError when attempting to get a value for field menu on serializer user_menu_permissionSerializer.
The serializer field might be named incorrectly and not match any attribute or key on the user_menu_permission instance.
Original exception text was: 'user_menu_permission' object has no attribute 'menu'."
if I change user_menu_permissionSerializer like that
class user_menu_permissionSerializer(serializers.ModelSerializer):
class Meta:
model = user_menu_permission
fields = ['menuID', 'permissionID']
I get result like that bu I want get menu as tree also.. but unfortunetly...
[
{
"id": 1,
"username": "admin",
"menuler": []
},
{
"id": 2,
"username": "taner.kader",
"menuler": [
{
"menuID": 2,
"permissionID": 1
},
{
"menuID": 3,
"permissionID": 1
},
{
"menuID": 5,
"permissionID": 1
}
]
}
]

Answer 1

I have solved like below
models
class defined_views(models.Model):
name = models.CharField(max_length=150)
class defined_permissions(models.Model):
name = models.CharField(max_length=150)
class menuler(models.Model):
adi= models.CharField(max_length=150, null=True)
sira= models.PositiveIntegerField(null=True, blank=True)
parentId= models.ForeignKey('self', null=True, on_delete=models.CASCADE)
viewId= models.ForeignKey(defined_views, null=True, on_delete=models.CASCADE)
menu_type= models.CharField(max_length=150, null=True)
permissionID = models.ManyToManyField(defined_permissions, through='user_menu_permission')
userId = models.ManyToManyField(User, through='user_menu_permission')
class user_menu_permission(models.Model):
# userId = models.ForeignKey(User, related_name='kullanici_menuler', null=False, on_delete=models.CASCADE)
userId = models.ForeignKey(User, null=False, on_delete=models.CASCADE)
menuID = models.ForeignKey(menuler,null=False, on_delete=models.CASCADE)
permissionID = models.ForeignKey(defined_permissions, null=True, on_delete=models.CASCADE)
serializers
class defined_permissionsSerializer(serializers.ModelSerializer):
class Meta:
model = defined_permissions
fields = ['id', 'name']
class defined_viewsSerializer(serializers.ModelSerializer):
class Meta:
model = defined_views
fields = ['id', 'name']
class menulerSerializer(serializers.ModelSerializer):
class Meta:
model = menuler
fields = ['id', 'adi', 'sira', 'parentId', 'viewId', 'menu_type']
# fields = ['adi']
class user_menu_permissionSerializer(serializers.ModelSerializer):
# menu = menulerSerializer(many=True)
class Meta:
model = user_menu_permission
fields = ['menuID', 'permissionID']
class UserSerializer(serializers.ModelSerializer):
# menuler = user_menu_permissionSerializer(
# source='user_menu_permission_set', many=True)
# kullanici_menuler = user_menu_permissionSerializer(many=True)
kullanici_menuler= menulerSerializer(source='menuler_set', many=True)
class Meta:
model = User
fields = ['id', 'username', 'kullanici_menuler']
and result
[
{
"id": 1,
"username": "admin",
"kullanici_menuler": []
},
{
"id": 2,
"username": "tayfun.uzun",
"kullanici_menuler": [
{
"id": 2,
"adi": "Yapılacaklar Listesi",
"sira": 1,
"parentId": 1,
"viewId": 1,
"menu_type": "view"
},
{
"id": 3,
"adi": "Raporlamalar",
"sira": 2,
"parentId": 1,
"viewId": 2,
"menu_type": "view"
},
{
"id": 5,
"adi": "Süreç İşleyişleri",
"sira": 1,
"parentId": 4,
"viewId": 3,
"menu_type": "view"
}
]
}
]

Answer 2

Try below something like this:
serializer.py :
class user_menu_permissionSerializer(serializers.ModelSerializer):
menu = menulerSerializer(many=True)
class Meta:
model = user_menu_permission
fields = ['menuID', 'permissionID', 'menu']
views.py :
class userView(APIView):
def get(self, request):
data = User.objects.all()
serializer = UserSerializer(data, many=True)
return Response(serializer.data)