Vue+Django 2.0.6 学习笔记 5.10 drf过滤

一时失言乱红尘 2022-01-25 23:03 209阅读 1赞

额 我之前竟然把10-11都漏掉了 难怪我看视频看到6.5就开始一脸懵逼

继续

class GoodsListViewset(mixins.ListModelMixin, viewsets.GenericViewSet):
        """
        商品列表页.
        """
    
        serializer_class = GoodsSerializer
        pagination_class = GoodsPagination
    
    # 也就这里的不同 将queryset那列放下来了 因为 GenericViewSet也是调用get_queryset函数来获取model的
        def get_queryset(self):
            return Goods.objects.filter(shop_price__gt = 100)

这样可以过滤商品价格大于100元的数据

但是这样写太死板 可以这样写

def get_queryset(self):
    # 这个all()并不会获取大量数据 只是生成获取所有数据的sql命令 直到迭代的时候才会获取
            queryset = Goods.objects.all()
    # price_min是前端获取的字段
            price_min = self.request.query_params.get('price_min', 0)
            if price_min:
                queryset = queryset.filter(shop_price__gt = int(price_min))
    
            return queryset

效果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NvdWx3eWI_size_16_color_FFFFFF_t_70][]

更进一步 使用 filtering:

DjangoFilterBackend

SearchFilter

OrderingFilter

先安装 django-filter

然后添加

INSTALLED_APPS = ['django_filters']

views.py:

from django_filters.rest_framework import DjangoFilterBackend
    
    
    class GoodsListViewset(mixins.ListModelMixin, viewsets.GenericViewSet):
        """
        商品列表页.
        """
    # get_queryset函数就不用了
        queryset = Goods.objects.all().order_by('id')
        serializer_class = GoodsSerializer
        pagination_class = GoodsPagination
        filter_backends = (DjangoFilterBackend,)
        filter_fields = ('name', 'shop_price')

效果：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NvdWx3eWI_size_16_color_FFFFFF_t_70 1][]

点击后：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NvdWx3eWI_size_16_color_FFFFFF_t_70 2][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NvdWx3eWI_size_16_color_FFFFFF_t_70 3][]

如果此过滤功能不满足 可以自定义一个filter文件和类

这样就完成数据过滤的功能

# filter.py
    
    import django_filters
    
    from django.db.models import Q
    
    from .models import Goods
    
    # Django2.0 的继承类
    class GoodsFilter(django_filters.rest_framework.FilterSet):
        """
        商品的过滤类
        """
    
    # 这里要注意 2.0之后改成了field_name 而不是name
        price_min = django_filters.NumberFilter(field_name='shop_price', lookup_expr='gte')
        price_max = django_filters.NumberFilter(field_name='shop_price', lookup_expr='lte')
    
    
        class Meta:
            model = Goods
            fields = ['price_min','price_max']
    
    #views.py
    
    from .filters import GoodsFilter
    
    
    class GoodsListViewset(mixins.ListModelMixin, viewsets.GenericViewSet):
        """
        商品列表页.
        """
    
        queryset = Goods.objects.all().order_by('id')
        serializer_class = GoodsSerializer
        pagination_class = GoodsPagination
        filter_backends = (DjangoFilterBackend,)
        filter_class = GoodsFilter

完结

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