如果在Django中将id指定为ForeignKey,则无法发布指定特定id的条目

我有两种型号, Book 和 ReadBy 如models.py中所述:

class Book(models.Model):
    created = models.DateTimeField(auto_now_add=True)
    owner = models.ForeignKey(MyUser)

class ReadBy(models.Model):
    created = models.DateTimeField(auto_now_add=True)
    owner = models.ForeignKey(MyUser)
    book = models.ForeignKey(Book)

视图.py:

class BookViewSet(viewsets.ModelViewSet):
    queryset = Book.objects.all()
    serializer_class = BookSerializer
    permission_classes = (permissions.IsAuthenticatedOrReadOnly,)

    def pre_save(self, obj):
        obj.owner = self.request.user

class ReadByViewSet(viewsets.ModelViewSet):
    queryset = ReadBy.objects.all()
    serializer_class = ReadBySerializer
    permission_classes = (permissions.IsAuthenticatedOrReadOnly,)

    def pre_save(self, obj):
        obj.owner = self.request.user

序列化程序.py:

class BookSerializer(serializers.ModelSerializer):
    readby = serializers.SerializerMethodField('get_ready_by')

    def get_read_by(self, obj):
        user = self.context['request'].user
        book = obj
        return ReadBy.objects.filter(book=book, owner=user).exists()

    class Meta:
        model = Book
        fields = ('id', 'created', 'owner', 'readby')

class ReadBySerializer(serializers.ModelSerializer):
    owner = serializers.Field(source='owner.id')
    book = serializers.Field(source='book.id')

    class Meta:
        model = ReadBy
        fields = ('id', 'created', 'owner', 'book')

书是一本 ForeignKey 在里面 ReadBy(读取者) 。原因是我想通过定义 readby BookSerializer中的字段设置为true或false。

现在,当我尝试POST ReadBy项时,我无法显式设置book_id,即使我尝试了,我仍然会收到相同的错误:

“列'book_id'不能为空”

我需要知道的是如何明确指定book_id,以便能够“阅读”一本书。

谢谢