- json
- json + model_to_dict
- json + serializers
class GoodsListView(View):
def get(self, request):
"""
通过Django的view实现商品列表页
返回json字符串
:param request:
:return:
"""
goods = Goods.objects.all()[:10]
# version 1.0
# json_list = []
# for good in goods:
# json_dict = {}
# json_dict['name'] = good.name
# json_dict['category'] = good.category.name
# json_dict['market_price'] = good.market_price
# json_list.append(json_dict)
# import json
# from django.http import HttpResponse
# return HttpResponse(json.dumps(json_list), content_type='application/json')
# version 1.1
# import json
# json_list = []
# from django.forms.models import model_to_dict
# for good in goods:
# json_dict = model_to_dict(good)
# json_list.append(json_dict)
# return HttpResponse(json.dumps(json_list), content_type='application/json')
# version 1.2
from django.core import serializers
import json
json_data = serializers.serialize('json', goods)
json_list = json.loads(json_data)
from django.http import JsonResponse
return JsonResponse(json_list, safe=False)
APIView
# # serializers.py
# class GoodsSerializer(serializers.Serializer):
# """
# 自定义serializer
# """
# name = serializers.CharField(required=True, max_length=100)
# click_num = serializers.IntegerField(default=0)
# goods_front_image = serializers.ImageField()
#
# def create(self, validated_data):
# """
# Create and return a new 'Goods' instance, given the validated data.
# """
# return Goods.objects.create(**validated_data)
# # views.py
# # APIView
# class GoodsListView(APIView):
# """
# list all goods
# """
# def get(self, request):
# goods = Goods.objects.all()[:10]
# goods_serializer = GoodsSerializer(goods, many=True)
# return Response(goods_serializer.data)
#
# def post(self, request, format=None):
# serializer = GoodsSerializer(data=request.data)
# if serializer.is_valid():
# serializer.save()
# return Response(serializer.data, status=status.HTTP_201_CREATED)
# return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
ModelSerializer
class GoodsSerializer(serializers.ModelSerializer):
category = CategorySerializer() # 外键的嵌入
class Meta:
model = Goods
fields = "__all__"
mixins generics
class GoodsPagination(PageNumberPagination):
page_size = 12
page_size_query_param = 'page_size' # 可自定义每页取多少条数据 example http://127.0.0.1:8000/goods/?p=4&page_size=16
page_query_param = 'page'
max_page_size = 100
# mixins generics APIView
class GoodsListView(generics.ListAPIView):
"""
list all goods
"""
queryset = Goods.objects.all()
serializer_class = GoodsSerializer
pagination_class = GoodsPagination
ViewSet *****
class GoodsListViewSet(mixins.ListModelMixin, mixins.RetrieveModelMixin, viewsets.GenericViewSet):
"""
商品列表页 分页、搜索、过滤、排序
"""
# order_by解决：UnorderedObjectListWarning: Pagination may yield inconsistent results with an unordered object_list
queryset = Goods.objects.order_by('id') # 数据源
serializer_class = GoodsSerializer
pagination_class = GoodsPagination
# authentication_classes = (TokenAuthentication,)
# https://django-filter.readthedocs.io/en/master/
filter_backends = (DjangoFilterBackend, filters.SearchFilter, filters.OrderingFilter) # 过滤器
search_fields = ('name', 'goods_brief', 'goods_desc') # 搜索
ordering_fields = ('sold_num', 'shop_price') # 排序
filter_class = GoodsFilter # 过滤
View层级关系
# GenericViewSet(viewset) -- drf
# GenericAPIView -- drf
# APIView -- drf
# View -- django
Mixin层级关系
# Mixin
# CreateModelMixin
# ListModelMixin
# UpdateModelMixin
# RetrieveModelMixin
# DestroyModelMixin
