我正在和django和DRF一起做一个项目。我遇到了这个错误AssertionError at /barber/info/ The field 'comments' was declared on serializer BarberSerializer, but has not been included in the 'fields' option.
我不知道为什么我面临这个错误，尽管我已经添加了'评论'在我的领域。这是我的serializer：

class BarberSerializer(serializers.ModelSerializer):
    comments = CommentSerializer(many=True)
    rating = serializers.SerializerMethodField(source= "get_rating")
    customers_rate = serializers.SerializerMethodField()
    # comments = serializers.SerializerMethodField()
    # rating = serializers.SerializerMethodField()
    # comment_body = serializers.CharField(write_only=True, required=False)
    class Meta:
        model = Barber
        fields = ('id','BarberShop','Owner','phone_Number','area','address','rate', "rating",
                  "customers_rate", 'background','logo', 'comments', )# ,"comment_body", ]# "rating"]
        read_only_fields = ("id", "created_at", "BarberShop", "Owner", "phone_Number", "area", "address" ,
                            'background','logo',"comments", "rate", "rating", "customers_rate")
    def get_comments(self, obj):
        comments = obj.comments.all()
        serializer = CommentSerializer(comments, many=True, context=self.context)
        return serializer.data  
    def get_rating(self, obj):
        comments = obj.comments.all()
        if comments:
            ratings = [comment.rating for comment in comments]
            return sum(ratings) / len(ratings)
        return 0
    def get_rating(self,obj):
        ratings = obj.ratings.all()
        if ratings :
            ratings = [rating_instance.rating for rating_instance in ratings]
            # print(*ratings, sep = "\*n")
            return round(sum(ratings) / len(ratings), 2)
        else:
            return 3.33
    def get_customers_rate(self, obj):
        customer = self.context['request'].user.customer
        # print(customer, sep = "*****\n")
        try:
            rating = obj.ratings.filter(customer=customer).order_by("-created_at").first()
            # rating = Rating.objects.get(customer= customer, barber = obj)
            return rating.rating
        except:
            return 3.33
            
    # def create(self, validated_data):
    #     validated_data['customer'] = self.context['request'].user.customer
    #     return super().create(validated_data)
    
    
    # services = ServiceSerializer(many=True)
    categories = CategorySerializer(many=True)
    class Meta:
        model = Barber
        fields = ['id','BarberShop','Owner','phone_Number','area','address','rate','background','logo','categories']

我不知道是什么问题。