django def django-filter的method过滤

from django.shortcuts import render

from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework import status
from rest_framework.parsers import JSONParser
from rest_framework import mixins, generics
from rest_framework.generics import ListAPIView
from rest_framework.pagination import PageNumberPagination
from goods.models import Goods, GoodsCategory
from goods.serializer import GoodsSerializer, CategorySerializer
from rest_framework import viewsets
from django_filters.rest_framework import DjangoFilterBackend

import django_filters
from rest_framework import filters
from django.db.models import Q


class GoodsFilter(django_filters.rest_framework.FilterSet):
    category_id = django_filters.rest_framework.NumberFilter(method=‘filter_catetory_id‘)

    def filter_catetory_id(self, queryset, name, value):
        return queryset.filter(Q(category_id=value) | Q(category__parent_category_id=value) | Q(
            category__parent_category__parent_category_id=value))

    class Meta:
        model = Goods
        fields = [‘category_id‘]


class GoodsList(mixins.ListModelMixin, viewsets.GenericViewSet):
    class GoodsPagination(PageNumberPagination):
        page_size = 2
        page_size_query_param = ‘pageSize‘
        page_query_param = ‘p‘
        max_page_size = 100

    queryset = Goods.objects.all()  # 不能切片后再过滤，例如：Goods.objects.all()[:10]
    serializer_class = GoodsSerializer
    pagination_class = GoodsPagination
    filter_backends = (DjangoFilterBackend, filters.SearchFilter, filters.OrderingFilter)
    search_fields = (‘=name‘,)  # 文档：https://www.django-rest-framework.org/api-guide/filtering/#searchfilter
    ordering_fields = (‘name‘,)
    # filter_fields = (‘name‘,) #逗号必加,缺点无法模糊查询
    filterset_class = GoodsFilter

class GoodsSerializer(serializers.ModelSerializer):
    """
    Goods的serializer
    """
    # 自定义，可以获取到外键数据
    # read_only表示只用在获取数据
    category_obj = CategorySerializer(source=‘category‘,read_only=True)
    category_name = serializers.CharField(source=‘category.name‘,read_only=True)
    class Meta:
        model = Goods
        # 外键写类里的名就可以
        # fields = (‘name‘,‘chick_num‘,‘category‘)
        fields = ‘__all__‘