生鲜超市项目(二)

from goods.models import Goods
from django.views.generic import View


class GoodsListView(View):
    def get(self, request):
        # 通过django的view实现商品列表页
        json_list = []
        # 获取所有商品
        goods = Goods.objects.all()
        # for good in goods:
        #     json_dict = {}
        #     #获取商品的每个字段，键值对形式
        #     json_dict[‘name‘] = good.name
        #     json_dict[‘category‘] = good.category.name
        #     json_dict[‘market_price‘] = good.market_price
        #     json_list.append(json_dict)

        ‘‘‘
            model_to_dict
            Object of type ImageFieldFile is not JSON serializable
            `````````````` add_time `````````````

        from django.forms.models import model_to_dict
        for good in goods:
            json_dict = model_to_dict(good)
            json_list.append(json_dict)
        ‘‘‘

        ‘‘‘
            django serializer

        from django.core import serializers
        from django.http import JsonResponse
        import json
        json_data = serializers.serialize(‘json‘,goods)
        json_data = json.loads(json_data)
        return JsonResponse(json_data,safe=False)

        ‘‘‘
        from django.http import HttpResponse
        #  只能转换dict和list类型
        import json
        # 返回json，一定要指定类型content_type=‘application/json‘
        return HttpResponse(json.dumps(json_list), content_type=‘application/json‘)

from django.urls import path,include,re_path
import xadmin
from django.views.static import serve
from RcShop.settings import MEDIA_ROOT
# from goods.view_base import GoodsListView

from rest_framework.documentation import include_docs_urls
from goods.views import GoodsListViewSet
from rest_framework.routers import DefaultRouter

router = DefaultRouter()

#配置goods的url
router.register(r‘goods‘, GoodsListViewSet)

urlpatterns = [
    path(‘xadmin/‘, xadmin.site.urls),
    path(‘api-auth/‘,include(‘rest_framework.urls‘)),
    path(‘ueditor/‘,include(‘DjangoUeditor.urls‘ )),
    #文件
    path(‘media/<path:path>‘,serve,{‘document_root‘:MEDIA_ROOT}),
    #drf文档，title自定义
    path(‘docs‘,include_docs_urls(title=‘Rc生鲜‘)),
    #商品列表页
    re_path(‘‘, include(router.urls)),
]

from rest_framework.views import APIView
from goods.serializers import GoodsSerializer
from .models import Goods
from rest_framework.response import Response
from rest_framework import mixins
from rest_framework import generics
from rest_framework.pagination import PageNumberPagination
from rest_framework import viewsets
from .filters import GoodsFilter
from django_filters.rest_framework import DjangoFilterBackend
from rest_framework import filters


class GoodsPagination(PageNumberPagination):
    ‘‘‘
    商品列表自定义分页
    ‘‘‘
    #默认每页显示的个数
    page_size = 10
    #可以动态改变每页显示的个数
    page_size_query_param = ‘page_size‘
    #页码参数
    page_query_param = ‘page‘
    #最多能显示多少页
    max_page_size = 100


class GoodsListViewSet(mixins.ListModelMixin,viewsets.GenericViewSet):
    ‘商品列表页‘

    #这里必须要定义一个默认的排序,否则会报错
    queryset = Goods.objects.all()
    # 分页
    pagination_class = GoodsPagination
    #序列化
    serializer_class = GoodsSerializer
    filter_backends = (DjangoFilterBackend,filters.SearchFilter,filters.OrderingFilter)

    # 设置filter的类为我们自定义的类
    #过滤
    filter_class = GoodsFilter
    #搜索,=name表示精确搜索，也可以使用各种正则表达式
    search_fields = (‘=name‘,‘goods_brief‘)
    #排序
    ordering_fields = (‘sold_num‘, ‘add_time‘)

import django_filters
from django.db.models import Q

from .models import Goods


class GoodsFilter(django_filters.rest_framework.FilterSet):
    ‘‘‘
    商品过滤的类
    ‘‘‘
    #两个参数，name是要过滤的字段，lookup是执行的行为，‘小与等于本店价格’
    price_min = django_filters.NumberFilter(field_name="shop_price", lookup_expr=‘gte‘)
    price_max = django_filters.NumberFilter(field_name="shop_price", lookup_expr=‘lte‘)
    name = django_filters.CharFilter(field_name="name", lookup_expr=‘icontains‘)
    top_category = django_filters.NumberFilter(field_name="top_category", method=‘top_category_filter‘)

    def top_category_filter(self, queryset, name, value):
        # queryset = queryset.filter(Q(category_id=value)|Q(category__parent_category_id=value)|Q(category__parent_category__parent_category_id=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 = [‘price_min‘,‘price_max‘,‘name‘,‘top_category‘,‘is_hot‘,‘is_new‘]

from  rest_framework import serializers
from django.db.models import Q
from .models import Goods, GoodsCategory, GoodsImage, Banner, IndexAd, GoodsCategoryBrand


class CategorySerializer3(serializers.ModelSerializer):
    class Meta:
        model = GoodsCategory
        fields = ‘__all__‘

class CategorySerializer2(serializers.ModelSerializer):
    sub_cat = CategorySerializer3(many=True)
    class Meta:
        model = GoodsCategory
        fields = ‘__all__‘

class CategorySerializer(serializers.ModelSerializer):
    sub_cat = CategorySerializer2(many=True)
    class Meta:
        model = GoodsCategory
        fields = ‘__all__‘

class GoodsSerializer(serializers.ModelSerializer):
    #  覆盖原来只有id的类别
    category = CategorySerializer()
    class Meta:
        model = Goods
        fields = ‘__all__‘