how can i create Db table using ForiegnKey relationship in DRF - django

Question

Halo i'm working on creating multiple DB table using foreignKey but i'm having some error hoping anyone can help out, below is my code & the error msg
###models.py file
class SchoolVideo(models.Model):
school = models.ForeignKey(
Profile, on_delete=models.CASCADE, related_name='school_video')
intro_video = models.FileField(
upload_to='assets/videos', blank=True, null=True)
###serializer file
class VideoSerializer(serializers.ModelSerializer):
class Meta:
model = SchoolVideo
fields = ('intro_video',)
def create(self, validated_data, *args, **kwargs):
if 'user' in validated_data:
user = validated_data.pop('user')
else:
user = Profile.objects.create(**validated_data)
school_video = SchoolVideo.objects.update_or_create(
user=user, defaults=validated_data
)
return school_video
###API VIEW
class SchoolVideoAPi(generics.CreateAPIView):
serializer_class = VideoSerializer
queryset = SchoolVideo.objects.all()
permission_class = [permissions.IsAuthenticated]
parser_classes = (MultiPartParser, FormParser)
def create(self, request, *args, **kwargs):
serializer = self.get_serializer(
data=request.data, instance=request.user.profile.school_video
)
serializer.is_valid(raise_exception=True)
self.perform_create(serializer)
headers = self.get_success_headers(serializer.data)
return Response(
serializer.data,
message='Video successfully Uploaded',
status=status.HTTPS_201_CREATED,
headers=headers,
)
def perform_create(self, serializer):
print(self.request.user.profile)
serializer.save(user=self.request.user.profile)
this is the traceback/err message i'm getting
##err traceback
response = handler(request, *args, **kwargs)
File "/home/olaneat/Desktop/files/project/django/schMrk/lib/python3.8/site-packages/rest_framework/generics.py", line 190, in post
return self.create(request, *args, **kwargs)
File "/home/olaneat/Desktop/files/project/django/schMrk/sch-market/schoolDetail/apiviews.py", line 117, in create
self.perform_create(serializer)
File "/home/olaneat/Desktop/files/project/django/schMrk/sch-market/schoolDetail/apiviews.py", line 128, in perform_create
serializer.save(user=self.request.user.profile)
File "/home/olaneat/Desktop/files/project/django/schMrk/lib/python3.8/site-packages/rest_framework/serializers.py", line 205, in save
self.instance = self.create(validated_data)
File "/home/olaneat/Desktop/files/project/django/schMrk/lib/python3.8/site-packages/rest_framework/serializers.py", line 939, in create
instance = ModelClass._default_manager.create(**validated_data)
File "/home/olaneat/Desktop/files/project/django/schMrk/lib/python3.8/site-packages/django/db/models/manager.py", line 85, in manager_method
return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/home/olaneat/Desktop/files/project/django/schMrk/lib/python3.8/site-packages/django/db/models/query.py", line 445, in create
obj = self.model(**kwargs)
File "/home/olaneat/Desktop/files/project/django/schMrk/lib/python3.8/site-packages/django/db/models/base.py", line 483, in __init__
_setattr(self, field.name, rel_obj)
File "/home/olaneat/Desktop/files/project/django/schMrk/lib/python3.8/site-packages/django/db/models/fields/related_descriptors.py", line 215, in __set__
raise ValueError(
ValueError: Cannot assign "<CustomUser: abc#xyz.com>": "SchoolVideo.school" must be a "Profile" instance.
[][1
can anyone help out

Answer 1

The error is caused by this line:
instance=request.user.profile.school_video
As the error says, you are passing school_video as an instance, but it is failing because it is a RelatedManager. Just filter out which school_video you need to fix this.
For example:
instance=request.user.profile.school_video.first()
or
instance=request.user.profile.school_video.filter(<your filters).first()
Just making sure your queryset returns only one object.
Also next time, please try to avoid adding images for code and errors and just put them as text in the question.