drf filter (sorting query conditions) finisher
table of Contents
First, check the interface group various filtering components
data preparation
models.py
View Code
Registration admin.py
admin.site.register(models.Car)serializers.py
class CarModelSerializer(serializers.ModelSerializer):
class Meta:
model = models.Car
fields = ['name', 'price', 'brand']views.py
# Car的群查接口
from rest_framework.generics import ListAPIView
class CarListAPIView(ListAPIView):
queryset = models.Car.objects.all()
serializer_class = serializers.CarModelSerializerurls.py
url(r'^cars/$', views.CarListAPIView.as_view()),1.drf search filter assembly
views.py
from rest_framework.generics import ListAPIView
# 第一步：drf的SearchFilter - 搜索过滤
from rest_framework.filters import SearchFilter
class CarListAPIView(ListAPIView):
queryset = models.Car.objects # 固定的两个东西，源码内部默认为None
serializer_class = serializers.CarModelSerializer
# 第二步：局部配置 过滤类 们（全局配置用DEFAULT_FILTER_BACKENDS）
filter_backends = [SearchFilter]
# 第三步：SearchFilter过滤类依赖的过滤条件 => 接口：/cars/?search=...
search_fields = ['name', 'price']
# eg：/cars/?search=1，name和price中包含1的数据都会被查询出2. drf sorting filter assembly
views.py
from rest_framework.generics import ListAPIView
# 第一步：drf的OrderingFilter - 排序过滤
from rest_framework.filters import OrderingFilter
class CarListAPIView(ListAPIView):
queryset = models.Car.objects
serializer_class = serializers.CarModelSerializer
# 第二步：局部配置 过滤类 们（全局配置用DEFAULT_FILTER_BACKENDS）
filter_backends = [OrderingFilter]
# 第三步：OrderingFilter过滤类依赖的过滤条件 => 接口：/cars/?ordering=...
ordering_fields = ['pk', 'price']
# eg：/cars/?ordering=-price,pk，先按price降序，如果出现price相同，再按pk升序3. drf basis paging component
api / pahenations.py
from rest_framework.pagination import PageNumberPagination
class MyPageNumberPagination(PageNumberPagination):
# ?page=1,这个就是url中的key，
page_query_param = 'page'
# ?page=1 不传自定义条数时默认一页显示的条数，可以通过下面的参数设置自定义
page_size = 3
# ?page=2&page_size=3 第二页每页显示3条数据 用户自定义一页显示的条数
page_size_query_param = 'page_size'
# 用户自定义一页显示的条数最大限制：数值超过5也只显示5条
max_page_size = 5views.py
from rest_framework.generics import ListAPIView
class CarListAPIView(ListAPIView):
# 如果queryset没有过滤条件，就必须 .all()，不然分页会出问题，上面搜索和排序不需要all是因为人家已经过滤过了
queryset = models.Car.objects.all()
serializer_class = serializers.CarModelSerializer
# 分页组件 - 给视图类配置分页类即可 - 分页类需要自定义，继承drf提供的分页类即可
pagination_class = pagenations.MyPageNumberPagination
4. drf offset tab assembly
pahenations.py
from rest_framework.pagination import LimitOffsetPagination
class MyLimitOffsetPagination(LimitOffsetPagination):
# ?offset=从头偏移的条数&limit=要显示的条数
limit_query_param = 'limit'
offset_query_param = 'offset'
# ?不传offset和limit默认显示前3条，只设置offset就是从偏移位往后再显示3条
default_limit = 3
# ?limit可以自定义一页显示的最大条数
max_limit = 5
# 在偏移组件基础上只使用limit结合ordering可以实现排行前几或后几，后面我们会自定义limit过滤器就不需要基于分页了
# ?ordering=-price&limit=2 => 价格前2views.py
from rest_framework.generics import ListAPIView
class CarListAPIView(ListAPIView):
# 如果queryset没有过滤条件，就必须 .all()，不然分页会出问题
queryset = models.Car.objects.all()
serializer_class = serializers.CarModelSerializer
# 分页组件 - 给视图类配置分页类即可 - 分页类需要自定义，继承drf提供的分页类即可
pagination_class = pagenations.MyLimitOffsetPagination5. drf cursor tab assembly (Learn)
pahenations.py
# 注：必须基于排序规则下进行分页
# 1）如果接口配置了OrderingFilter过滤器，那么url中必须传ordering
# 1）如果接口没有配置OrderingFilter过滤器，一定要在分页类中声明ordering按某个字段进行默认排序
from rest_framework.pagination import CursorPagination
class MyCursorPagination(CursorPagination):
cursor_query_param = 'cursor'
page_size = 3
page_size_query_param = 'page_size'
max_page_size = 5
ordering = '-pk' # 按照pk降序排列views.py
from rest_framework.generics import ListAPIView
class CarListAPIView(ListAPIView):
# 如果queryset没有过滤条件，就必须 .all()，不然分页会出问题
queryset = models.Car.objects.all()
serializer_class = serializers.CarModelSerializer
# 分页组件 - 给视图类配置分页类即可 - 分页类需要自定义，继承drf提供的分页类即可
pagination_class = pagenations.MyCursorPagination6. Custom filters limit
I do not want help page, I wanted to customize a filter strip number, he can limit the display of each filter assembly Filter Results
filters.py
# 自定义过滤器，接口：?limit=显示的条数
class LimitFilter:
def filter_queryset(self, request, queryset, view):
# 前台固定用 ?limit=... 传递过滤参数
limit = request.query_params.get('limit')
if limit:
limit = int(limit)
return queryset[:limit] # 切片，限制条数
return queryset
# eg：/cars/?ordering=-price,pk&limit=3，先按price降序，如果出现price相同，再按pk升序,筛选结果显示3条views.py
from rest_framework.generics import ListAPIView
class CarListAPIView(ListAPIView):
# 如果queryset没有过滤条件，就必须 .all()，不然分页会出问题
queryset = models.Car.objects.all()
serializer_class = serializers.CarModelSerializer
# 局部配置 过滤类 们（全局配置用DEFAULT_FILTER_BACKENDS）
filter_backends = [LimitFilter]7. The filter insert: django-filter
installation
>: pip3 install django-filterLayer filter conditions: Custom api / filters.py
# django-filter插件过滤器类
from django_filters.rest_framework.filterset import FilterSet
from . import models
# 自定义过滤字段
from django_filters import filters
class CarFilterSet(FilterSet):
min_price = filters.NumberFilter(field_name='price', lookup_expr='gte') # gte lte 源码里面有，表示最大最小值
max_price = filters.NumberFilter(field_name='price', lookup_expr='lte')
class Meta:
model = models.Car
fields = ['brand', 'min_price', 'max_price']
# brand是model中存在的字段，一般都是可以用于分组的字段
# min_price、max_price是自定义字段，需要自己自定义过滤条件View layer: views.py
# django-filter插件过滤器
from django_filters.rest_framework import DjangoFilterBackend
from .filters import CarFilterSet
class CarListAPIView(ListAPIView):
queryset = models.Car.objects.all()
serializer_class = serializers.CarModelSerializer
# 局部配置 过滤类 们（全局配置用DEFAULT_FILTER_BACKENDS）
filter_backends = [DjangoFilterBackend]
# django-filter过滤器插件使用
filter_class = CarFilterSet
# 接口：?brand=...&min_price=...&max_price=...
# eg:?brand=宝马&min_price=5&max_price=10 => 5~10间的宝马牌汽车