第一种分页pagenumberpagination
基本使用
（1）urls.py
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urlpatterns = [ re_path('(?p<version>[v1|v2]+)/page1/', pager1view.as_view(),) #分页1] |
（2）api/utils/serializers/pager.py
（3）views.py
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from api.utils.serializsers.pager import pagerserialiserfrom rest_framework.response import responsefrom rest_framework.pagination import pagenumberpaginationclass pager1view(apiview): def get(self,request,*args,**kwargs): #获取所有数据 roles = models.role.objects.all() #创建分页对象 pg = pagenumberpagination() #获取分页的数据 page_roles = pg.paginate_queryset(queryset=roles,request=request,view=self) #对数据进行序列化 ser = pagerserialiser(instance=page_roles,many=true) return response(ser.data) |
（4）settings配置
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rest_framework = { #分页 "page_size":2 #每页显示多少个} |
自定义分页类
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#自定义分页类class mypagenumberpagination(pagenumberpagination): #每页显示多少个 page_size = 3 #默认每页显示3个，可以通过传入pager1/?page=2&size=4,改变默认每页显示的个数 page_size_query_param = "size" #最大页数不超过10 max_page_size = 10 #获取页码数的 page_query_param = "page"class pager1view(apiview): def get(self,request,*args,**kwargs): #获取所有数据 roles = models.role.objects.all() #创建分页对象，这里是自定义的mypagenumberpagination pg = mypagenumberpagination() #获取分页的数据 page_roles = pg.paginate_queryset(queryset=roles,request=request,view=self) #对数据进行序列化 ser = pagerserialiser(instance=page_roles,many=true) return response(ser.data) |
第二种分页 limitoffsetpagination
自定义
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#自定义分页类2class mylimitoffsetpagination(limitoffsetpagination): #默认显示的个数 default_limit = 2 #当前的位置 offset_query_param = "offset" #通过limit改变默认显示的个数 limit_query_param = "limit" #一页最多显示的个数 max_limit = 10class pager1view(apiview): def get(self,request,*args,**kwargs): #获取所有数据 roles = models.role.objects.all() #创建分页对象 pg = mylimitoffsetpagination() #获取分页的数据 page_roles = pg.paginate_queryset(queryset=roles,request=request,view=self) #对数据进行序列化 ser = pagerserialiser(instance=page_roles,many=true) return response(ser.data) |
返回的时候可以用get_paginated_response方法
自带上一页下一页
第三种分页cursorpagination
加密分页方式，只能通过点“上一页”和下一页访问数据
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#自定义分页类3 (加密分页)class mycursorpagination(cursorpagination): cursor_query_param = "cursor" page_size = 2 #每页显示2个数据 ordering = 'id' #排序 page_size_query_param = none max_page_size = noneclass pager1view(apiview): def get(self,request,*args,**kwargs): #获取所有数据 roles = models.role.objects.all() #创建分页对象 pg = mycursorpagination() #获取分页的数据 page_roles = pg.paginate_queryset(queryset=roles,request=request,view=self) #对数据进行序列化 ser = pagerserialiser(instance=page_roles,many=true) # return response(ser.data) return pg.get_paginated_response(ser.data) |
代码
版本、解析器、序列化和分页
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# myproject2/urls.pyfrom django.contrib import adminfrom django.urls import path,includeurlpatterns = [ #path('admin/', admin.site.urls), path('api/',include('api.urls') ),] |
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# api/urls.pyfrom django.urls import path,re_pathfrom .views import userview,paserview,rolesview,userinfoview,groupview,usergroupviewfrom .views import pager1viewurlpatterns = [ re_path('(?p<version>[v1|v2]+)/users/', userview.as_view(),name = 'api_user'), #版本 path('paser/', paserview.as_view(),), #解析 re_path('(?p<version>[v1|v2]+)/roles/', rolesview.as_view()), #序列化 re_path('(?p<version>[v1|v2]+)/info/', userinfoview.as_view()), #序列化 re_path('(?p<version>[v1|v2]+)/group/(?p<pk>\d+)/', groupview.as_view(),name = 'gp'), #序列化生成url re_path('(?p<version>[v1|v2]+)/usergroup/', usergroupview.as_view(),), #序列化做验证 re_path('(?p<version>[v1|v2]+)/pager1/', pager1view.as_view(),) #分页1] |
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# api/models.pyfrom django.db import modelsclass userinfo(models.model): user_type = ( (1,'普通用户'), (2,'vip'), (3,'svip') ) user_type = models.integerfield(choices=user_type) username = models.charfield(max_length=32,unique=true) password = models.charfield(max_length=64) group = models.foreignkey('usergroup',on_delete=models.cascade) roles = models.manytomanyfield('role')class usertoken(models.model): user = models.onetoonefield('userinfo',on_delete=models.cascade) token = models.charfield(max_length=64)class usergroup(models.model): title = models.charfield(max_length=32)class role(models.model): title = models.charfield(max_length=32) |
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# api/views.pyimport jsonfrom django.shortcuts import render,httpresponsefrom rest_framework.views import apiviewfrom rest_framework.request import requestfrom rest_framework.versioning import urlpathversioningfrom . import models##########################################版本和解析器#####################################################class userview(apiview): def get(self,request,*args,**kwargs): #获取版本 print(request.version) #获取处理版本的对象 print(request.versioning_scheme) #获取浏览器访问的url，reverse反向解析 #需要两个参数：viewname就是url中的别名，request=request是url中要传入的参数 #(?p<version>[v1|v2]+)/users/，这里本来需要传version的参数，但是version包含在request里面，所有只需要request=request就可以 url_path = request.versioning_scheme.reverse(viewname='api_user',request=request) print(url_path) self.dispatch return httpresponse('用户列表')# from rest_framework.parsers import jsonparser,formparserclass paserview(apiview): '''解析''' # parser_classes = [jsonparser,formparser,] #jsonparser：表示只能解析content-type:application/json的头 #formparser:表示只能解析content-type:application/x-www-form-urlencoded的头 def post(self,request,*args,**kwargs): #获取解析后的结果 print(request.data) return httpresponse('paser')###########################################序列化###########################################################from rest_framework import serializers#要先写一个序列化的类class rolesserializer(serializers.serializer): #role表里面的字段id和title序列化 id = serializers.integerfield() title = serializers.charfield()class rolesview(apiview): def get(self,request,*args,**kwargs): # 方式一：对于[obj,obj,obj] # （queryset） # roles = models.role.objects.all() # 序列化，两个参数，instance:queryset 如果有多个值，就需要加 mangy=true # ser = rolesserializer(instance=roles,many=true) # 转成json格式，ensure_ascii=false表示显示中文，默认为true # ret = json.dumps(ser.data,ensure_ascii=false) # 方式二： role = models.role.objects.all().first() ser = rolesserializer(instance=role, many=false) ret = json.dumps(ser.data, ensure_ascii=false) return httpresponse(ret)# class userinfoserializer(serializers.serializer):# '''序列化用户的信息'''# #user_type是choices（1,2,3），显示全称的方法用source# type = serializers.charfield(source="get_user_type_display")# username = serializers.charfield()# password = serializers.charfield()# #group.title：组的名字# group = serializers.charfield(source="group.title")# #serializermethodfield(),表示自定义显示# #然后写一个自定义的方法# rls = serializers.serializermethodfield()## def get_rls(self,row):# #获取用户所有的角色# role_obj_list = row.roles.all()# ret = []# #获取角色的id和名字# #以字典的键值对方式显示# for item in role_obj_list:# ret.append({"id":item.id,"title":item.title})# return ret# class userinfoserializer(serializers.modelserializer):# type = serializers.charfield(source="get_user_type_display")# group = serializers.charfield(source="group.title")# rls = serializers.serializermethodfield()## def get_rls(self, row):# # 获取用户所有的角色# role_obj_list = row.roles.all()# ret = []# # 获取角色的id和名字# # 以字典的键值对方式显示# for item in role_obj_list:# ret.append({"id": item.id, "title": item.title})# return ret## class meta:# model = models.userinfo# fields = ['id','username','password','type','group','rls']# class userinfoserializer(serializers.modelserializer):# class meta:# model = models.userinfo# #fields = "__all__"# fields = ['id','username','password','group','roles']# #表示连表的深度# depth = 1class userinfoserializer(serializers.modelserializer): group = serializers.hyperlinkedidentityfield(view_name='gp',lookup_field='group_id',lookup_url_kwarg='pk') class meta: model = models.userinfo #fields = "__all__" fields = ['id','username','password','group','roles'] #表示连表的深度 depth = 0class userinfoview(apiview): '''用户的信息''' def get(self,request,*args,**kwargs): users = models.userinfo.objects.all() #这里必须要传参数context={'request':request} ser = userinfoserializer(instance=users,many=true,context={'request':request}) ret = json.dumps(ser.data,ensure_ascii=false) return httpresponse(ret)class groupserializer(serializers.modelserializer): class meta: model = models.usergroup fields = "__all__"class groupview(apiview): def get(self,request,*args,**kwargs): pk = kwargs.get('pk') obj = models.usergroup.objects.filter(pk=pk).first() ser = groupserializer(instance=obj,many=false) ret = json.dumps(ser.data,ensure_ascii=false) return httpresponse(ret)####################################序列化之用户请求数据验证验证#####################################自定义验证规则class groupvalidation(object): def __init__(self,base): self.base = base def __call__(self, value): if not value.startswith(self.base): message = "标题必须以%s为开头"%self.base raise serializers.validationerror(message)class usergroupserializer(serializers.serializer): title = serializers.charfield(validators=[groupvalidation('以我开头'),])class usergroupview(apiview): def post(self,request,*args, **kwargs): ser = usergroupserializer(data=request.data) if ser.is_valid(): print(ser.validated_data['title']) else: print(ser.errors) return httpresponse("用户提交数据验证")##################################################分页###################################################from api.utils.serializsers.pager import pagerserialiserfrom rest_framework.response import responsefrom rest_framework.pagination import pagenumberpagination,limitoffsetpagination,cursorpagination# #自定义分页类1# class mypagenumberpagination(pagenumberpagination):# #每页显示多少个# page_size = 3# #默认每页显示3个，可以通过传入pager1/?page=2&size=4,改变默认每页显示的个数# page_size_query_param = "size"# #最大页数不超过10# max_page_size = 10# #获取页码数的# page_query_param = "page"#自定义分页类2class mylimitoffsetpagination(limitoffsetpagination): #默认显示的个数 default_limit = 2 #当前的位置 offset_query_param = "offset" #通过limit改变默认显示的个数 limit_query_param = "limit" #一页最多显示的个数 max_limit = 10#自定义分页类3 (加密分页)class mycursorpagination(cursorpagination): cursor_query_param = "cursor" page_size = 2 #每页显示2个数据 ordering = 'id' #排序 page_size_query_param = none max_page_size = noneclass pager1view(apiview): def get(self,request,*args,**kwargs): #获取所有数据 roles = models.role.objects.all() #创建分页对象 pg = mycursorpagination() #获取分页的数据 page_roles = pg.paginate_queryset(queryset=roles,request=request,view=self) #对数据进行序列化 ser = pagerserialiser(instance=page_roles,many=true) return response(ser.data) # return pg.get_paginated_response(ser.data) |
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# api/utils/serializsers/pager.pyfrom rest_framework import serializersfrom api import modelsclass pagerserialiser(serializers.modelserializer): class meta: model = models.role fields = "__all__" |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://www.cnblogs.com/derek1184405959/p/8727595.html
