Django-rest-framework中过滤器的定制实例

1、定义一个自定义的filter.py模块，增加一个新的过滤类

import django_filters#这个Q可以支持表查询，单下划线获取表字段，双下划线获取关联表，from django.db.models import Q#引入自己的模型from app.item.models import ItemCategory#自定义的过滤类，需要继承django_filter.rest_framework中的FilterSet类class ItemCategoryFilter(django_filters.rest_framework.FilterSet): Filter_category = django_filters.NumberFilter(method=’category_filter’, label=’Filter_category’) #django_filters.NumberFilter类似，ModelForm中字段类型的控制 #其中method指向自己定义的过滤函数，label用于标识在测试API界面中的过滤界面字段，Filter_category控制查询字段 def category_filter(self, queryset, name, value): #这里用到多级联表查询 return queryset.filter(Q(category_id=value)|Q(category__parent_id=value)|Q(category__parent__parent_id=value)|Q(category__parent__parent__parent_id=value)) class Meta: model = ItemCategory fields = []

2、将视图处理类中的，过滤器后端重新指定，将过滤器类连接到我们自定义实现的处理类上

class ItemsListByCategory(generics.ListCreateAPIView): ’’’ 根据category编号获取相关模型no。 请求中请带有参数category @:require param: category such as: GET /itemsListByCategory/?Filter_category=2 ’’’ from django_filters.rest_framework import DjangoFilterBackend from app.item.filters import ItemCategoryFilter queryset = ItemCategory.objects.all() serializer_class = ItemCategorySerializer pagination_class = CommonPagination # 在这里哦 filter_backends = (DjangoFilterBackend,) filter_class =ItemCategoryFilter permission_classes = (ReadOnly,)

补充知识：Django restful framework 中的 filter 自定义过滤

class AlertFilter(django_filters.rest_framework.FilterSet): ....... to_bearer_service = django_filters.rest_framework.CharFilter(method=’to_bearer_service_filter’, label=’bearer_service’) class Meta: model = Alert fields = [......, ’to_bearer_service’] @staticmethod # 如果想获取请求信息可以去掉这个静态方法的装饰器，为什么要加静态方法装饰器我也不清楚 def to_bearer_service_filter(queryset, name, value): Q_id = Q() for i in value.split(','): if i == '0':Q_id.add(Q(**{’to_bearer_service’:None}), Q.OR) else:Q_id.add(Q(**{’to_bearer_service_id’: int(i)}), Q.OR) queryset = queryset.filter(Q_id) return queryset def to_bearer_service_filter(self, queryset, name, value): Q_id = Q() for i in value.split(','): if i == '0':Q_id.add(Q(**{’to_bearer_service’:None}), Q.OR) else:Q_id.add(Q(**{’to_bearer_service_id’: int(i)}), Q.OR) queryset = queryset.filter(Q_id) return queryset

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