Nsryjdtyk

How can I set values on to a ManyToManyField which specifies an intermediary model?

In the models.py

class BookUser(models.Model):

    email = models.EmailField()



class Book(models.Model):

    author_id= models.CharField(max_length=255)

    send_to = models.ManyToManyField(BookUser, through='BookUserRelationship')

    book_id = models.AutoField(primary_key=True)

    file_size = models.CharField(null=True)



class BookUserRelationship(models.Model):

    book = models.ForeignKey(Book, on_delete=models.CASCADE)

    user = models.ForeignKey(BookUser, on_delete=models.CASCADE)

    shared_date = models.DateTimeField(auto_now_add=True,null=True,blank=True)

Tried to update in serializers.py

class BookSerializer(serializers.ModelSerializer):

    send_to = BookUserSerializer(many=True, read_only=True)



    class Meta():

        model = Book

        fields = ('book_id', 'author_id','file_size','send_to')



class BookUserSerializer(serializers.ModelSerializer):

    model = BookUser

    fields = ('email')

In the views.py for listing the books by passing the book_id as query params

class BookListView(generics.ListCreateAPIView):

    serializer_class = serializers.BookSerializer



    def get(self, request, *args, **kwargs):

        user = self.request.user

        book_id = self.request.query_params.get('book_id', None)

        if book_id:

            book = models.Book.objects.filter(book_id=book_id)

             return Response(serializers.BookSerializer(book[0]).data)

You don't need to do anything at all. You have already set the relevant data in your for loop, by creating the BookUserRelationship instances. That is the many-to-many relationship; you should just remove the instance.send_to.set(emails) line.