NOT NULL constraint failed: new__common_farmmodel.user_id - python-3.x

Question

I'm trying to make a part of application for the farmer. I did part with registration, loggin and option "add new farm" for the loggin user, but when I tried to add new farm (filled all fields and click on "POST") it was:
django.db.utils.IntegrityError: NOT NULL constraint failed:
new__common_farmmodel.user_id
I found this NOT NULL constraint failed: user_profile.user_id
and tried redo my FarmModel, by now when tried migrate I get:
File "manage.py", line 21, in <module>
main()
File "manage.py", line 17, in main
execute_from_command_line(sys.argv)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
utility.execute()
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\core\management\__init__.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
self.execute(*args, **cmd_options)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\core\management\base.py", line 364, in execute
output = self.handle(*args, **options)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\core\management\base.py", line 83, in wrapped
res = handle_func(*args, **kwargs)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\core\management\commands\migrate.py", line 234, in handle
fake_initial=fake_initial,
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\migrations\executor.py", line 117, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\migrations\executor.py", line 147, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\migrations\executor.py", line 245, in apply_migration
state = migration.apply(state, schema_editor)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\migrations\migration.py", line 124, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\migrations\operations\fields.py", line 249, in database_forwards
schema_editor.alter_field(from_model, from_field, to_field)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\backends\sqlite3\schema.py", line 137, in alter_field
super().alter_field(model, old_field, new_field, strict=strict)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\backends\base\schema.py", line 535, in alter_field
old_db_params, new_db_params, strict)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\backends\sqlite3\schema.py", line 359, in _alter_field
self._remake_table(model, alter_field=(old_field, new_field))
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\backends\sqlite3\schema.py", line 286, in _remake_table
self.quote_name(model._meta.db_table),
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\backends\base\schema.py", line 137, in execute
cursor.execute(sql, params)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\backends\utils.py", line 99, in execute
return super().execute(sql, params)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\backends\utils.py", line 67, in execute
return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\backends\utils.py", line 76, in _execute_with_wrappers
return executor(sql, params, many, context)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\utils.py", line 89, in __exit__
raise dj_exc_value.with_traceback(traceback) from exc_value
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
return self.cursor.execute(sql, params)
File "C:\Users\filip\.virtualenvs\ToDoBees\lib\site-packages\django\db\backends\sqlite3\base.py", line 383, in execute
return Database.Cursor.execute(self, query, params)
django.db.utils.IntegrityError: NOT NULL constraint failed: new__common_farmmodel.user_id
My actual part of code:
# models.py
FARMER = 'Farmer'
BEEKEEPER = 'Beekeeper'
BUYER = 'Buyer'
USER_TYPE_WITH_NAME_CHOICES = [(FARMER, 'Farmer'), (BEEKEEPER, 'Beekeeper'), (BUYER, 'Buyer')]
class CustomUser(BaseUser):
user = BaseUserManager()
role = models.CharField(choices=USER_TYPE_WITH_NAME_CHOICES, max_length=10, default=BUYER)
telephone = models.CharField(max_length=12)
add_new_farm = models.BooleanField(default=False)
class FarmModel(models.Model):
user = ForeignKey(CustomUser, default=CustomUser, null=None, on_delete=CASCADE)
is_fallen = models.BooleanField(default=False)
it_forest = models.BooleanField(default=False)
farm_location = models.CharField(max_length=250)
since_when_sown = models.DateField()
field_size = models.IntegerField()
additional_description = models.CharField(max_length=1000)
crop_type = models.CharField(max_length=100)
# serializers.py
class RegisterSerializer(serializers.ModelSerializer):
password = serializers.CharField(max_length=100, min_length=4, required=True, label='Set your password', write_only=True)
password2 = serializers.CharField(max_length=100, min_length=4, label='Confirm Password', write_only=True)
telephone = serializers.CharField(max_length=12, label='Enter your phone number', required=False)
from .models import USER_TYPE_WITH_NAME_CHOICES
role = serializers.ChoiceField(required=True, choices=USER_TYPE_WITH_NAME_CHOICES)
class Meta:
model = CustomUser
fields = ('email', 'role', 'password', 'password2', 'first_name', 'last_name', 'telephone')
def create(self, validator_data):
user = CustomUser.objects.create()
user.set_password(validator_data['password'])
user.save()
return user
def hash_password(password):
salt = hashlib.sha256(os.urandom(60)).hexdigest().encode('ascii')
pwdhash = hashlib.pbkdf2_hmac('sha512', password.encode('utf-8'), salt, 100000)
pwdhash = binascii.hexlify(pwdhash)
return (salt + pwdhash).decode('ascii')
def verify_password(stored_password, provided_password):
salt = stored_password[:64]
stored_password = stored_password[64:]
pwdhash = hashlib.pbkdf2_hmac('sha512', provided_password.encode('utf-8'), salt.encode('ascii'), 100000)
pwdhash = binascii.hexlify(pwdhash).decode('ascii')
return pwdhash == stored_password
def validate(self, attrs):
if attrs.get('password') != attrs.get('password2'):
raise serializers.ValidationError('Those passwords don\'t match.')
return attrs
class UserSerializer(serializers.ModelSerializer):
class Meta:
model = CustomUser
fields = ('add_new_farm',)
class AddFarmSerializer(serializers.ModelSerializer):
permission_classes = [permissions.IsAuthenticatedOrReadOnly]
class Meta:
model = FarmModel
fields = ('is_fallen', 'it_forest', 'farm_location', 'since_when_sown', 'field_size', 'additional_description', 'crop_type')
def create(self, validated_data):
user = self.context.get('user')
validated_data['user'] = user
return FarmModel.objects.create(**validated_data)
# views.py
User = get_user_model()
class UserRegistration(CreateAPIView):
queryset = User.objects.all()
serializer_class = RegisterSerializer
authentication_classes = ()
permission_classes = ()
def post(self, request, *args, **kwargs):
serializer = self.get_serializer(data=request.data)
serializer.is_valid(raise_exception=True)
self.perform_create(serializer)
return Response(serializer.data, status=status.HTTP_201_CREATED)
def login_request(request):
return render(request=request, template_name='')
class LoggedUserView(ListCreateAPIView):
queryset = User.objects.all()
serializer_class = UserSerializer
def list(self, request, **kwargs):
queryset = self.get_queryset()
serializer = UserSerializer(queryset)
return Response(serializer.data)
class AddFarm(CreateAPIView):
queryset = FarmModel.objects.all()
serializer_class = AddFarmSerializer
def create(self, request, *args, **kwargs):
data = request.data.copy()
data['user'] = request.user
serializer = self.get_serializer(data=data)
serializer.is_valid(raise_exception=True)
self.perform_create(serializer)
user = request.user
serializer = AddFarmSerializer(AddFarm, context={'user': user})
headers = self.get_success_headers(serializer.data)
return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers) ```

Answer 1

You should use boolean field for null. null = None does not make sense.
You can use
null= True or null=False
Here you have to use null=True
because you want null value(by default) supported field
Documentation link here

Answer 2

I suppose that is not problem in model, I think so... Tell me, it is good code in views:
class AddFarm(CreateAPIView):
queryset = FarmModel.objects.all()
serializer_class = AddFarmSerializer
def create(self, request, *args, **kwargs):
data = request.data.copy()
data['user'] = request.user
serializer = self.get_serializer(data=data)
serializer.is_valid(raise_exception=True)
self.perform_create(serializer)
user = request.user
serializer = AddFarmSerializer(AddFarm, context={'user': user})
headers = self.get_success_headers(serializer.data)
return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)
and in serializers:
class AddFarmSerializer(serializers.ModelSerializer):
# permission_classes = [permissions.IsAuthenticatedOrReadOnly]
class Meta:
model = FarmModel
fields = ('is_fallen', 'it_forest', 'farm_location', 'since_when_sown', 'field_size', 'additional_description',
'crop_type')
def create(self, validated_data):
user = self._context.get('user')
validated_data['user'] = user
return FarmModel.objects.create(**validated_data)
?
I can't find any solution :/