分类筛选过滤器

分类筛选过滤器

>: pip install django-filter

二、分类筛选过滤器

# 分类筛选：django-filter：filter_backends配置DjangoFilterBackend，再在filter_fields中配置分组筛选的字段
from django_filters.rest_framework import DjangoFilterBackend

class FreeCourseListAPIView(ListAPIView):
    queryset = models.Course.objects.filter(is_delete=False, is_show=True).order_by('orders').all()
    serializer_class = serializers.FreeCourseModelSerializer
  
    # 自定义过滤器
    filter_backends = [DjangoFilterBackend]  

   # 参与分类筛序的字段，所有字段都可以，但是分组字段要有意义
   # 分类字段是要序列化的字段获取序列化字段中的字段，就可以直接分类
   # http://127.0.0.1:8000/course/free?course_category=2
    filter_fields = ["course_category"] # 要筛选的字段(序列化字段)

三、 自定义区间删选过滤器

# 参考DjangoFilterBackend类中
if filterset_fields and queryset is not None:
    MetaBase = getattr(self.filterset_base, 'Meta', object)

    class AutoFilterSet(self.filterset_base):
        class Meta(MetaBase):
            model = queryset.model
            fields = filterset_fields

            return AutoFilterSet

# 1.自定义区间过滤器类
# 基于django-filter插件，完成指定区间筛选（一般都是对应数字字段）

from django_filters.rest_framework.filterset import FilterSet
from django_filters import filters
from . import models

class CourseFilterSet(FilterSet):
    max_price = filters.NumberFilter(field_name="price", lookup_expr="lte")
    min_price = filters.NumberFilter(field_name="price", lookup_expr="gte")

    class Meta:
        model = models.Course
        # 过滤的字段，序列化中的字段
        fields = ["course_category", "max_price", "min_price"]
        
# 2.使用
# 自定义的区间筛序选过滤器
from .filters import CourseFilterSet


class FreeCourseListAPIView(ListAPIView):
    queryset = models.Course.objects.filter(is_delete=False, is_show=True).order_by('orders').all()
    serializer_class = serializers.FreeCourseModelSerializer
    # 自定义类
    filter_class = CourseFilterSet
# eg: http://127.0.0.1:8000/course/free?min_price=2&max_price=100
# eg: http://127.0.0.1:8000/course/free?course_category=2

自定义filter类时的字段

models.AutoField:                   {'filter_class': NumberFilter},
models.CharField:                   {'filter_class': CharFilter},
models.TextField:                   {'filter_class': CharFilter},
models.BooleanField:                {'filter_class': BooleanFilter},
models.DateField:                   {'filter_class': DateFilter},
models.DateTimeField:               {'filter_class': DateTimeFilter},
models.TimeField:                   {'filter_class': TimeFilter},
models.DurationField:               {'filter_class': DurationFilter},
models.DecimalField:                {'filter_class': NumberFilter},
models.SmallIntegerField:           {'filter_class': NumberFilter},
models.IntegerField:                {'filter_class': NumberFilter},
models.PositiveIntegerField:        {'filter_class': NumberFilter},
models.PositiveSmallIntegerField:   {'filter_class': NumberFilter},
models.FloatField:                  {'filter_class': NumberFilter},
models.NullBooleanField:            {'filter_class': BooleanFilter},
models.SlugField:                   {'filter_class': CharFilter},
models.EmailField:                  {'filter_class': CharFilter},
models.FilePathField:               {'filter_class': CharFilter},
models.URLField:                    {'filter_class': CharFilter},
models.GenericIPAddressField:       {'filter_class': CharFilter},
models.CommaSeparatedIntegerField:  {'filter_class': CharFilter},
models.UUIDField:                   {'filter_class': UUIDFilter},