分页封装

# -*- coding: utf-8 -*-
from rest_framework.pagination import PageNumberPagination
from django.conf import settings
from django.core.paginator import EmptyPage,Paginator,PageNotAnInteger
from rest_framework.views import Response


#分页(局部) ：自定义分页器 局部
class PageNum(PageNotAnInteger):
    #查询字符串代表每页返回数据数量的参数名，默认值：None
    page_size_query_param=‘page_size‘


def Paginators(objs,request,Serializer):
    """
    objs:实验对象，queryset
    request:请求对象
    Serializer:对应实体对象的类
    page_size: 每页显示多少条数据
    page:      显示第几页数据
    total_count:总共有多少条数据
    total     :总页数
    """
    try:
        page_size=int(request.GET.get(‘page_size‘,settings.REST_FRAMEWORK[‘PAGE_SIZE‘]))
        page=int(request.GET.get(‘page‘,1))
    except (TypeError,ValueError):
        return Response(status=400)

    paginator=Paginator(objs,page_size) #paginator对象
    total_count=paginator.count
    total=paginator.num_pages       #总页数
    try:
        objs=paginator.page(page)
    except PageNotAnInteger:
        objs=paginator.page(1)
    except EmptyPage:
        objs=paginator.page(paginator.num_pages)
    serializer=Serializer(objs,many=True)
    return Response(
        data={
            ‘results‘:serializer.data,
            ‘page‘:page,
            ‘page_size‘:page_size,
            ‘total‘:total,
            ‘count‘:total_count
        }
    )
    

from rest_framework.views import APIView
from rest_framework.response import Response
from utils.api_paginator import Paginators
#实例化工单
class WorkOrderView111(APIView):
    queryset=WorkOrder.objects.all()
    serializer_class=WorkOrderSerizlizers
    pagination_class = PageNum
    def get(self,request):
        self.queryset=self.queryset.all()
        ret=Paginators(self.queryset,request,self.serializer_class)
        return Response(ret.data)