django分页、查询

1. 分页

1. 全局分页，在settings.py文件中写入项目

# 分页器 - 全局
REST_FRAMEWORK = {
     'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.PageNumberPagination',
     'PAGE_SIZE': 2
}

2. 局部分页
   在view项目中写入方法

from rest_framework.pagination import PageNumberPagination
class pagination(PageNumberPagination):
    max_page_size = 3   # 一页最多显示多少条数据
    page_size = 1   # 默认一页显示多少条数据
    page_query_param = 'aaa'    # 参数，用于指示第几页
    page_size_query_param = 'size'  # 页码的参数名

# 视图集
class StuView(ModelViewSet):
    queryset = Student.objects.all()
    serializer_class = StuSerializer
    # 分页
    pagination_class = pagination

2. 过滤

需要安装第三方模块

pip install django-filter  

安装后在settings中注册过滤

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'myapp', # 注册子应用
    'rest_framework', # 注册框架
    'corsheaders', # 跨域
    'django_filters'    # 注册过滤
]

1. 全局过滤,在settings.py文件中写入项目

REST_FRAMEWORK = {
    # 全局过滤
    'DEFAULT_FILTER_BACKENDS': ['django_filters.rest_framework.DjangoFilterBackend']
}

2. 精准过滤
   在view项目中写入方法

# 过滤
from django_filters.rest_framework import DjangoFilterBackend
# 视图集
class StuView(ModelViewSet):
    queryset = Student.objects.all()
    serializer_class = StuSerializer
    
    # 过滤
    # 1. 精准过滤
    filter_backends =  [DjangoFilterBackend]    # 指定过滤工具
    filter_fields = ['name', 'province']   # 过滤字段

3. 模糊过滤

  # 过滤
from django_filters.rest_framework import DjangoFilterBackend
import django_filters
# 自定义过滤器
class MyFilter(django_filters.rest_framework.FilterSet):
    min = django_filters.NumberFilter(field_name='score', lookup_expr='gte')
    max = django_filters.NumberFilter(field_name='score', lookup_expr='lte')
    name = django_filters.CharFilter(field_name='name', lookup_expr='icontains')

    class Meta:
        model = Student
        fields = ['min', 'max', 'name']
        
# 视图集
class StuView(ModelViewSet):
    queryset = Student.objects.all()
    serializer_class = StuSerializer

    # 模糊过滤
    filter_backends = [DjangoFilterBackend]
    filterset_class = MyFilter

4. rest_framework查询

# rest_framework过滤
from rest_framework.filters import SearchFilter
# 视图集
from rest_framework.viewsets import ModelViewSet
class StuView(ModelViewSet):
    queryset = Student.objects.all()
    serializer_class = StuSerializer
    
    # rest_framework
    filter_backends = [SearchFilter]
    # 使用外键字段要加__外键的字段
    search_fields = ['name','province__id']