how to pass null value to just one specific key of the one object using same DRF serializer

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• Upload file from html when block public access is true

  I am using django-s3direct to file upload

  https://github.com/bradleyg/django-s3direct

  Using IAM role setting because I upload the file from the server on ECS container.

  Now I set the blockPublicAccess of S3 false.

  When uploading images from html, there comes error.

  https://s3.ap-northeast-1.amazonaws.com/static-resource-v/images/c64d6e593de44aa5b10dcf1766582547/_origin.jpg?uploads (403 (Forbidden)
  )
  
  initiate error: static-resource-v/line-assets/images/c64d6e593de44aa5b10dcf1766582547/_origin.jpg AWS Code: AccessDenied, Message:Access Deniedstatus:403
  

  OK, it is understandable.

  Browser try to access the for initiation.

  However there is any way to upload file from browser when blockPublicAccess is true??
• Test a decorated function in Python

  I have a python function which is decorated.

      @retry_if_access_token_expired(app_id)
      def add_something(
          self,
          *,
          argument1,
          argument1 = None,
      ):
  
            """adding something"""
  

  I've written tests for the given as below.

      @patch("other inside function to mock")
      @patch("other insdie function to mock 2")
      def test_add_something(
          self, mock_1, mock_2
      ):
          """ some logic to test the add something method """
  

  But I am getting this error that says add_somehthing takes 1 positional argument.

  TypeError: add_something() takes 1 positional argument but 3 were given
• Django Rest Framework ignoring custom field

  I have a model with a nullable boolean field that I'd like to have serialized in a way that converts null in the output to false.

  My model:

  class UserPreferences(models.Model):
      receive_push_notifications = models.BooleanField(
          null=True, blank=True,
          help_text=("Receive push notifications))
  

  I'm trying to do it with a custom field like so:

  class StrictlyBooleanField(serializers.Field):
      def to_representation(self, value):
          # Force None to False
          return bool(value)
  
      def to_internal_value(self, data):
          return bool(data)
  
  
  class UserPreferencesSerializer(serializers.ModelSerializer):
      class Meta(object):
          model = UserPreferences
          fields = ('receive_push_notifications',)
  
      receive_push_notifications = StrictlyBooleanField()
  

  but this isn't working, I'm still seeing null in my API responses.

  I think I must be missing something simple in wiring it up because I don't even get an error if I replace my to_representation with:

  def to_representation(self, value):
      raise
  

  DRF doesn't seem to be calling my method at all... What am I missing here?
• Django Limit the Number of objects in a model

  i am working on a django-cms project and (i have to make a image model which can only make 3 objects not more than that if someone tries there should be a message: Max Objects Have been Created) so, how can i limit the number of objects in a model ? Thank you, I will Really appreciate you feedback.
• DRF how to update, create OneToOneField in serializers?

  I have two models, with OnetoOne field. How can I update/create them with help of serializers?

  class Page(models.Model):
   info = models.TextField(null=True, blank=True)
   document = models.OneToOneField(
          Document,
          primary_key=True,
          related_name='page',
          on_delete=models.CASCADE)
  
  
  class Document(models.Model)
        description = models.TextField(null=True, blank=True)
        note = models.TextField(null=True, blank=True)
  

  My serializer

  class PageSerializer(ModelSerializer):
        document = DocumentSerializer()
      
        class Meta:
           model = Page 
           fields = ('document', 'info')
  
  
  def update:
  
  def create:
  
• Django dumpdata serializing an int as string

  I've been trying to make a custom class/type, defined in a separate db.py file, to be properly serialized as an int when doing a manage.py dumpdata command, but this BitFlagField always ends up exported as a string, the value accompanied by double quotes, while other integer fields are properly exported without the quotes in the JSON file. The person that made it left the place almost a year ago, so I can't get any help from him.

  This is the class' code - note that I've fixed the __str__ function and also changed the __repr__ to return repr(self.value)

  This is how it looks after the dumpdata: (...), "blocked": "8"}} ; For comparison, two other integer fields don't come with the value enclosed by quotes: "pk": 1, "bit":8,. Because of this, manage.py loaddata fails:

  django.core.serializers.base.DeserializationError: Problem installing fixture '/home/abcd/djangoapp/data.json': '>=' not supported between instances of 'str' and 'int': (core.userextra:pk=1) field_value was '8'
  

  If I manually remove the quotes from the "blocked" field's value, the loaddata command works.

  If I delete both __str__ and __repr__ functions, the object type is what ends up as the data: (...), "blocked": "<core.db.BitFlag object at 0x7f9f2eb0bf40>"}}. If I make either of them return self.value, it complains that it was expecting a str type.

  What I need is to either save that value as an int in the JSON, which so far I haven't managed to, or deserialize it somewhere, but I can't figure out the where part, as, in my mind, that should be a simple return int(self.value).
• Want to send extra data from BasePermission to Queryset in ModelVIewSet DRF

  Here is My Seller Model which has User as OneToOneField

  #models.py
  .
  . 
  class CompanyProfile(models.Model):
      user = models.OneToOneField(User, on_delete=models.CASCADE, related_name="user")
      company = models.CharField(max_length=255)
      pincode = models.IntegerField()
      city = models.ForeignKey(City, on_delete=models.CASCADE)
      address = models.TextField()
      profileActive = models.BooleanField(default=False)
  .
  .
  

  Purchase Model

  #models.py
  
  class PurchaseOrder(models.Model):
      company = models.ForeignKey(CompanyProfile, on_delete=models.CASCADE)
      message = models.TextField(blank=True, null=True)
      expectedDelivery = models.DateField(blank=True, null=True)
      isCancel = models.BooleanField(default=False))
      updated_at = models.DateTimeField(auto_now=True)
  

  #Custom permission_classes

  class SellerCompanyActive(BasePermission):
      message = 'Only Seller with activated company account is allowed'
      def has_permission(self, request, view):
          user = AuthUser.objects.get(id=request.user.id)
          if user.is_seller:
              try:
                  company = CompanyProfile.objects.get(user=user)
                  if company.profileActive:
                      return True
                  else:
                      self.message = "Company profile is not active"
              except CompanyProfile.DoesNotExist:
                  self.message = "Company not found first create company"
          return False
  

  In ModelViewSet

  #views.py
  
  class SellerPurchaseOrder(viewsets.ModelViewSet):
      queryset = PurchaseOrder.objects.all()
      serializer_class = PurchaseOrderSerializer
      authorization_classes = [TokenAuthentication]
      permission_classes = [IsAuthenticated, SellerCompanyActive]
      
      def get_queryset(self):
          user = self.request.user
          company = CompanyProfile.objects.get(user=user)
          return self.queryset.filter(company=company)
  

  Now here I always had to use this

  user = self.request.user
  company = CompanyProfile.objects.get(user=user)
  

  As their are lot of other views also, Is their any other way to send data from my custom permission_classes i.e from SellerCompanyActive to direct SellerPurchaseOrder->get_queryset
• DRF using prefetch_related

  I have two classes Vessels and Components, each vessel has several components. I just want to fetch all vessels and all their related components in one query, I thought prefretch_related does that trick but in DRF in the api i am only receiving the vessels without their related components

  models.py

  class Vessel(models.Model):
      name = models.CharField(max_length=255, null=True, blank=True)
      imo = models.CharField(max_length=255, null=True, blank=True)
  
      def __str__(self):
          return self.name
  
  class Component(models.Model):
      vessel = models.ForeignKey(
          Vessel, blank=True, null=True, on_delete=models.CASCADE, related_name='vessel_components')
      name = models.CharField(max_length=200, blank=True, null=True)
      manufacturer = models.CharField(max_length=200, blank=True, null=True)
      model = models.CharField(max_length=200, blank=True, null=True)
      type = models.CharField(max_length=200, blank=True, null=True)
      remarks = models.TextField(blank=True, null=True)
  
      def __str__(self):
          return self.name
  

  serializers.py

  class VesselSerializer(serializers.ModelSerializer):
      class Meta:
          model = Vessel
          fields = '__all__'
  class ComponentSerializer(serializers.ModelSerializer):
      class Meta:
          model = Component
          fields = '__all__'
  

  the view :

  @api_view(['GET'])
  def getVessels(request):
      vessels = Vessel.objects.all().prefetch_related('vessel_components')
      vSerializer = VesselSerializer(vessels, many=True)
      return Response(vSerializer.data)
  

  the result i am getting :
• How to get top n rows in django rest framework serializers using serializers relations

  I have a serializer that is working fine for all of the data, which is getting from the Database. I want to get top n numbers of rows sorted by some value.

  Below is my code in views.py:

  @api_view(['GET'])
  def org_api(request, org_id):
      if request.method == 'GET':
          try:
              org = Organization.objects.prefetch_related('team').get(org_id=org_id)
          except Organization.DoesNotExist:
              return Response(status=status.HTTP_404_NOT_FOUND)
          serializers = OrgSerializers(org)
          return Response(serializers.data)
  

  And here is my serializers.py code:

  class OrgSerializers(serializers.ModelSerializer):
      team = TeamSerializer(many=True, read_only=True)
      class Meta:
          model = Organization
          fields = ['org_id','name', 'team']
  

  And here is my TeamSerializers Code:

  class TeamSerializer(serializers.ModelSerializer):
      org_id = serializers.PrimaryKeyRelatedField(queryset=Team.objects.all())
      class Meta:
          model = Team
          fields = ['name', 'resignation', 'org_id']
  

  It is returning all of the team members of the same organization like below:

  {
      "org_id": "ABC",
      "name": "Stocks Telegraph",
      "team": [
          {
              "name": "Mr. Timothy D. Cook",
              "title": "CEO & Director",
              "org_id": "ABC"
          },
          {
              "name": "Mr. Luca  Maestri",
              "title": "CFO & Sr. VP",
              "org_id": "ABC"
          },
          {
              "name": "Mr. Jeffrey E. Williams",
              "title": "Chief Operating Officer",
              "org_id": "ABC"
          },
          {
              "name": "Ms. Katherine L. Adams",
              "title": "Sr. VP, Gen. Counsel & Sec.",
              "org_id": "ABC"
          },
          {
              "name": "Ms. Deirdre  O'Brien",
              "title": "Sr. VP of People & Retail",
              "org_id": "ABC"
          },
          {
              "name": "Mr. Chris  Kondo",
              "title": "Sr. Director of Corp. Accounting",
              "org_id": "ABC"
          }
      ]
  }