Unit 15 Paging, Filtering

一.分页

1.什么是分页

RESTThe framework includes support for customizable pagination styles.

Paging is divided into two cases：
Global paging and local paging

2.全局分页设置

The global configuration information is placedsetting里面

REST_FRAMEWORK = {
    # 全局分页
    'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.PageNumberPagination',
    # 指定分页引擎
    'PAGE_SIZE': 2
    # 指定页面大小
}

全局&Use of partial paging
http://127.0.0.1:8000/路由名/?page=数字
At the same time modify the front-end data

After parsing the datadata后加上.results

3.局部分页设置

导入分页器

from rest_framework.pagination import PageNumberPagination

使用

class GoodView(ModelViewSet):
    queryset = Goods.objects.all()
    serializer_class = GoodsSerializer
    # 局部分页
    pagination_class = PageNumberPagination

注意,Use global paging
‘DEFAULT_PAGINATION_CLASS’:‘rest_framework.pagination.PageNumberPagination’,
进行注释,保留page行.Otherwise it won't work

4.自定义分页器

使用

class GoodView(ModelViewSet):
    queryset = Goods.objects.all()
    serializer_class = GoodsSerializer
    # 使用自定义分页器进行分页
    pagination_class = pagination

paginationPager defined for yourself

自定义分页器

class pagination(PageNumberPagination):
    max_page_size = 3 # 一页最多显示多少条数据
    page_size = 1 # How many pieces of data are displayed on one page by default
    page_query_param = 'page' # 参数,用于指定第几页
    page_size_query_param = 'size' # 参数,Used to specify how many pieces of data to display overnight

自定义分页器的使用
http://127.0.0.1:8000/路由名/?page=数字&size=数字
pagefor several pages sizeSeveral lines per page

二.过滤

1.django-filter的精准过滤

before using filteringsetting里进行安装

Global filtering configuration

REST_FRAMEWORK = {
    'DEFAULT_FILTER_BACKENDS': ['django_filters.rest_framework.DjangoFilterBackend']
}

Local precision filtering
1.导包

from django_filters.rest_framework import DjangoFilterBackend

2.使用

class GoodView(ModelViewSet):
    queryset = Goods.objects.all()
    serializer_class = GoodsSerializer
    # 局部过滤
    # 1.精准过滤
    # filter_backends = [DjangoFilterBackend] # 指定过滤工具
    # filter_fields = ['name','kind'] # 指定字段
    

2.django-filter的模糊过滤

Local blur filtering
导入

import django_filters

自定义过滤器

class MyFilter(django_filters.rest_framework.FilterSet):
    # 价格大于等于min_price
    # NumberFilterFilter on numeric types  field_name过滤的字段  lookup_expr过滤的表达式
    # gte 大于等于  lte 小于等于  icontains  不区分大小写的包含
    min_price = django_filters.NumberFilter(field_name='price',lookup_expr='gte')
    max_price = django_filters.NumberFilter(field_name='price',lookup_expr='lte')
    # CharFilter Filter data of string type
    name = django_filters.CharFilter(field_name='name',lookup_expr='icontains')
    # 元类
    class Meta:
        models = Goods  # 指定模型类
        fields = ['min_price','max_price','name'] # 指定过滤字段

指定过滤器

    # filter_backends = [DjangoFilterBackend]
    # filterset_class = MyFilter

3.rest_framework的SearchFilter

全局
settingfilter engine configuration

REST_FRAMEWORK = {
    
    'DEFAULT_FILTER_BACKENDS': ['rest_framework.filters.SearchFilter']
}

局部

class GoodView(ModelViewSet):
    queryset = Goods.objects.all()
    serializer_class = GoodsSerializer
    
    filter_backends = [SearchFilter]    #指定过滤工具
    # If you need to search using foreign key fields,使用 外键__外键字段 进行指定
    search_fields = ['name','kind__id']    # 指定过滤字段 kind__id kind__kind_name