Python学习————drf各类组件的用法和作用
2021-04-21 15:26
标签:param 实现 author rss throttle trie max 信息 代码 参考链接:https://blog.csdn.net/cc576795555/article/details/98336836 Python学习————drf各类组件的用法和作用 标签:param 实现 author rss throttle trie max 信息 代码 原文地址:https://www.cnblogs.com/x945669/p/13280713.htmlDRF组件的用法和作用
认证
自定义认证的类
"""
from rest_framework.authentication import BaseAuthentication
from rest_framework.exceptions import AuthenticationFailed
from authapp.models import UserToken
class MyOrderAuthentication(BaseAuthentication):
在这里实现认证的逻辑
def authenticate(self, request):
token = request._request.GET.get(‘token‘)
# 获取到token之后,需要在数据库中查找token
obj = UserToken.objects.filter(token=token).first()
if not obj:
# 没有通过认证
raise AuthenticationFailed(‘认证失败‘)
# 返回元组( user, auth )
return (obj.user, obj)
"""
使用局部配置(在视图函数中)
"""
class OrderView(APIView):
# 通过authentication_classes设置认证类
authentication_classes = [MyOrderAuthentication,]
# 通过authentication_classes设置为空列表,就不再进行认证了
# authentication_classes = []
"""
全局配置
"""
REST_FRAMEWORK = {
‘DEFAULT_AUTHENTICATION_CLASSES‘:[‘unitls.authentication.MyOrderAuthentication‘],
}
"""
设置匿名用户
"""
REST_FRAMEWORK = {
‘UNAUTHENTICATED_USER‘: lambda :"匿名用户",
‘UNAUTHENTICATED_TOKEN‘: lambda :‘123456‘,
}
"""
## 最最重要的,理清认证的源代码
权限
自定义权限类
"""
from rest_framework.permissions import BasePermission
class MyOrderPermission(BasePermission):
#自定义权限认证的类,必须要实现has_permission方法
message = ‘你不是超级用户,没有权限访问‘
def has_permission(self, request, view):
#Return `True` if permission is granted, `False` otherwise.
#返回True表示有权限访问,返回False表示没有权限访问
if request.user.user_type != 3:
return False
return True
"""
局部使用
"""
class OrderView(APIView):
# permission_classes设置权限类
permission_classes = [MyOrderPermission,]
# 通过authentication_classes设置为空列表,就不再进行权限认证了
permission_classes = []
"""
全局的设定
"""
REST_FRAMEWORK = {
‘DEFAULT_PERMISSION_CLASSES‘:[‘unitls.permission.MyOrderPermission‘],
}
"""
最最重要的,理清权限认证的源代码
分页
自定义分页类PageNumberPagination
# 自定制分页类
class MyPageNumberPagination(PageNumberPagination):
"""http://127.0.0.1:8000/api/userpage/?page=1&pagesize=10"""
# page_size每一返回多少条
page_size = 5
# 设置分页的参数名
page_query_param = ‘page‘
# 设置每页返回数据量的参数名
page_size_query_param = ‘pagesize‘
# 设置每页最大返回的条数
max_page_size = 6
使用
class UsersPageView(APIView):
def get(self,request,*args,**kwargs):
# 获取表中所有用户的row(记录)
obj = models.UserInfo.objects.all()
#实例化分页的类
#page_obj = PageNumberPagination()
page_obj = MyPageNumberPagination()
#获取分页数据
page_data = page_obj.paginate_queryset( queryset=obj,request=request,view=self)
# 序列化
ser = UsersSerializer(instance=page_data,many=True)
# return Response(ser.data)
#get_paginated_response会返回上一页下一页和总条数
return page_obj.get_paginated_response(ser.data)
自定义分页类LimitOffsetPagination
from rest_framework.pagination import LimitOffsetPagination
class MyLimitOffsetPagination(LimitOffsetPagination):
"""http://127.0.0.1:8000/api/userpage/?limit=10&offset=0"""
default_limit = 5
limit_query_param = ‘limit‘
offset_query_param = ‘offset‘
max_limit = 7
自定义分页类CursorPagination(会对分页参数进行加密)
from rest_framework.pagination import CursorPagination
class MyCursorPagination(CursorPagination):
"""http://127.0.0.1:8000/api/userpage/?cursor=cD01"""
cursor_query_param = ‘cursor‘
page_size = 4
#返回数据市的排序的方式
ordering = ‘-id‘
max_page_size = 8
设置全局的分页
"""
REST_FRAMEWORK = {
‘DEFAULT_PAGINATION_CLASS‘:‘unitl.pagination.MyCursorPagination‘,
‘PAGE_SIZE‘:3
}
"""
视图
以前 (Django的View)
"""
class MyView(View)
.....
"""
现在(rest_framework的APIView)
"""
class MyView(APIView)
.....
"""
其他视图的使用
第一个:GenericAPIView 视图的使用 (跟继承自APIViewq其实一样,只是我们在外面逻辑,
GenericAPIView在内部c定制方法帮我们实现了)
"""
from rest_framework.generics import GenericAPIView
class BookinfoSeralizer(serializers.ModelSerializer):
class Meta:
model = models.BookInfo
fields = "__all__"
class BookView(GenericAPIView):
# queryset: 设置获取的数据
queryset = models.BookInfo.objects.all()
# serializer_class: 设置序列化的类
serializer_class = BookinfoSeralizer
# pagination_class : 设置分页的类
pagination_class = MyPageNumberPagination
def get(self,request,*args,**kwargs):
obj = self.get_queryset() #=> obj = models.BookInfo.objects.all()
# 获取当前分页的数据
page_data = self.paginate_queryset(obj) #=>page_obj = MyPageNumberPagination() #获取分页数据page_data = page_obj.paginate_queryset()
# 获取序列化之后的数据
ser = self.get_serializer(instance=page_data,many=True) #->ser = BookinfoSeralizer(instance=page_data,many=True)
return Response(ser.data)
"""
第二个:GenericViewSet 视图的如下使用,注意路由会发生变化
"""
class BookView(GenericViewSet):
# queryset: 设置获取的数据
queryset = models.BookInfo.objects.all()
# serializer_class: 设置序列化的类
serializer_class = BookinfoSeralizer
# pagination_class : 设置分页的类
pagination_class = MyPageNumberPagination
def list(self,request,*args,**kwargs):
obj = self.get_queryset() #=> obj = models.BookInfo.objects.all()
# 获取当前分页的数据
page_data = self.paginate_queryset(obj) #=>page_obj = MyPageNumberPagination() #获取分页数据page_data = page_obj.paginate_queryset(
# 获取序列化之后的数据
ser = self.get_serializer(instance=page_data,many=True) #->ser = BookinfoSeralizer(instance=page_data,many=True)
return Response(ser.data)
"""
路由会发生变化,配置如下
"""
url(r"bookpage/$",views.BookView.as_view({‘get‘: ‘list‘}),name=‘bookpage‘)
"""
第三个:ListModelMixin,CreateModelMixin,RetrieveModelMixin,
DestroyModelMixin,UpdateModelMixin 等视图的使用
"""
from rest_framework.mixins import ListModelMixin,CreateModelMixin,RetrieveModelMixin,DestroyModelMixin,UpdateModelMixin
from rest_framework.viewsets import GenericViewSet
# ListModelMixin : 返回列表数据据( get请求)
# CreateModelMixin : 新增一条数据 (Post请求)
# RetrieveModelMixin, : 获取详情数据 (get请求)
# DestroyModelMixin, : 删除数据的时候 (delete)
# UpdateModelMixin : 跟新数据的时候使用 (put)
class BookView(ListModelMixin,RetrieveModelMixin,CreateModelMixin,DestroyModelMixin,UpdateModelMixin,GenericViewSet):
# queryset: 设置获取的数据
queryset = models.BookInfo.objects.all()
# serializer_class: 设置序列化的类
serializer_class = BookinfoSeralizer
# pagination_class : 设置分页的类
pagination_class = MyPageNumberPagination
"""
第四个:ModelViewSet视图的使用
ModelViewSet继承自istModelMixin,CreateModelMixin,
RetrieveModelMixin,DestroyModelMixin,UpdateModelMixin视图
如果要实现最基本的增删改查功能,就直接继承自ModelViewSet
"""
from rest_framework.viewsets import ModelViewSet
class BookView(ModelViewSet):
# queryset: 设置获取的数据
queryset = models.BookInfo.objects.all()
# serializer_class: 设置序列化的类
serializer_class = BookinfoSeralizer
# pagination_class : 设置分页的类
pagination_class = MyPageNumberPagination
"""
视图使用小总结
只想实现简单的增删改查
ModelViewSet
只想增
CreateModelMixin,GenericViewSet
只想增删改
CreateModelMixin,DestroyModelMixin,UpdateModelMixin,GenericViewSet
如果视图中的业务逻辑复杂,以上都不能满足的时候,直接使用
APIView
#自动路由配置
"""
from django.conf.urls import url,include
from api import views
from rest_framework import routers
router = routers.DefaultRouter()
router.register(r"bookpage",views.BookView,base_name=‘bookpage‘)
urlpatterns = [
url(r‘v1/‘,include(router.urls)),
]
"""
自动路由会生成四个接口
^api/ v1/ ^bookpage/$ [name=‘bookpage-list‘]
^api/ v1/ ^bookpage\.(?P
频率限制节流
节流:
自定义节流类
"""
VISIT_RECORD = {}
class VisitThrottle(object):
def __init__(self):
self.history = None
def allow_request(self,request,view):
#实现节流的逻辑
#基于ip做节流
# #获取用户访问的IP地址
# ip_address = request._request.META.get(‘REMOTE_ADDR‘)
ctime = time.time()
# if ip_address not in VISIT_RECORD:
# #第一次访问的时候将访问的时间存储在字典中(ip地址为Key,访问的时间为value值)
# VISIT_RECORD[ip_address] = [ctime,]
#
# #第二次访问的时候取出访问的历史记录
# history = VISIT_RECORD[ip_address]
# 基于用户的节流
username = request.user.username
if username not in VISIT_RECORD:
VISIT_RECORD[username] = [ctime, ]
history = VISIT_RECORD[username]
self.history = history
while history and history[-1]
版本控制
自定义版本控制类
"""
class ParmasVersion(object):
def determine_version(self, request, *args, **kwargs):
version = request.query_params.get(‘version‘)
return version
"""
使用(局部)
"""
class VersionView(APIView):
#设置获取版本的类
versioning_class = ParmasVersion
"""
全局设置
"""
‘DEFAULT_VERSIONING_CLASS‘:‘unitls.version.ParmasVersion‘,
"""
使用 DRF内置的版本控制类QueryParameterVersioning(局部)
"""
from rest_framework.versioning import QueryParameterVersioning
class VersionView(APIView):
#设置获取版本的类
versioning_class = QueryParameterVersioning
"""
设置文件中的配置信息
"""
REST_FRAMEWORK = {
‘VERSION_PARAM‘:‘version‘,
‘DEFAULT_VERSION‘:‘v1‘,
‘ALLOWED_VERSIONS‘:[‘v1‘,‘v2‘],
}
"""
全局设置
"""
REST_FRAMEWORK = {
‘VERSION_PARAM‘:‘version‘,
‘DEFAULT_VERSION‘:‘v1‘,
‘ALLOWED_VERSIONS‘:[‘v1‘,‘v2‘],
‘DEFAULT_VERSIONING_CLASS‘:‘rest_framework.versioning.QueryParameterVersioning‘,
}
"""
使用 DRF内置的版本控制类URLPathVersioning(局部)
"""
from rest_framework.versioning import URLPathVersioning
class VersionView(APIView):
#设置获取版本的类
versioning_class = URLPathVersioning
"""
设置文件中的配置信息
"""
REST_FRAMEWORK = {
‘VERSION_PARAM‘:‘version‘,
‘DEFAULT_VERSION‘:‘v1‘,
‘ALLOWED_VERSIONS‘:[‘v1‘,‘v2‘],
}
"""
全局设置
"""
REST_FRAMEWORK = {
‘VERSION_PARAM‘:‘version‘,
‘DEFAULT_VERSION‘:‘v1‘,
‘ALLOWED_VERSIONS‘:[‘v1‘,‘v2‘],
‘DEFAULT_VERSIONING_CLASS‘:‘rest_framework.versioning.URLPathVersioning‘,
}
"""
如果使用URLPathVersioning,路由格式如下
"""
url(r"^(?P
解析器
因为开发人员post请求上传数据时,传递的数据类型不同,我们可能在request._request.POST中获取不到数据
case1: Content-Type : application/x-www-form-urlencoded
服务端接收到的post请求的数据格式:username=xxxxx&age=18&sex=男
我们就可以在request._request.POST中获取到数据
"""
class UserInfoView(APIView):
def post(self,request,*args,**kwargs):
username = request._request.POST.get(‘username‘)
age = request._request.POST.get(‘age‘)
sex = request._request.POST.get(‘sex‘)
"""
case2:Content-Type:application/json
服务端接收到的post请求的数据格式就是json数据:{"username":"xxxx","age":"18","sex":"男"}
在request._request.POST中就获取不到数据,但是在request.body中可以拿到
"""
class UserInfoView(APIView):
def post(self,request,*args,**kwargs):
import json
data = json.loads(request.body.decode(‘utf8‘))
print(data)
"""
DRF内置的解析器FormParser,JSONParser
使用(局部):
"""
from rest_framework.parsers import FormParser,JSONParser
class UserInfoView(APIView):
parser_classes = [FormParser,JSONParser]
#这时DRF 内部代码会根据request.Content-Type和解析器支持的media_type比较
从而选择对应的解析器
def post(self,request,*args,**kwargs):
# 如果使用JSONParser、FormParser解析数据的话
data = request.data
print(data)
"""
渲染器
渲染器
INSTALLED_APPS = [
‘rest_framework‘,
]
from rest_framework.renderers import BrowsableAPIRenderer,JSONRenderer,AdminRenderer
class BookView(ModelViewSet):
# 设置渲染器类型
renderer_classes = [JSONRenderer]
序列化
Django的序列化
"""
#django序例化方式一
books = models.BookInfo.objects.all().values(‘id‘,‘bookname‘)
books = list(books)
print(type(books), books)
self.ret[‘books‘] = books
#django序例化方式二
books = models.BookInfo.objects.all()
books = [model_to_dict(item) for item in books]
self.ret[‘books‘] = books
"""
DRF 序列化
第一种:继承自serializers.Serializer
"""
class BookDetailSerializer(serializers.Serializer):
# 正常的字段序列化
id = serializers.IntegerField()
bookname = serializers.CharField()
author = serializers.CharField()
category = serializers.IntegerField()
bookdesc = serializers.CharField()
# 获取枚举类型的文本是 source=get_字段名_display
status = serializers.CharField(
source=‘get_status_display‘
)
categoryname = serializers.CharField(
source=‘get_category_display‘
)
# 自定义方法获取字段
chpaters = serializers.SerializerMethodField()
#序列化时可以自定义方法获取字段
def get_chpaters(self,row):
""" row - > bookinfo """
chpaters = models.ChpaterInfo.objects.filter(book=row)
ser = ChpaterSerializer(instance=chpaters,many=True,
context=self.context
)
return ser.data
"""
序列化时生成url
"""
url = serializers.HyperlinkedIdentityField(
view_name=‘chpaterdetail‘, lookup_field=‘id‘,
lookup_url_kwarg=‘pk‘,
)
"""
注意:如果序列化类中使用HyperlinkedIdentityField生成url,那我们在序例化时添加context={‘request‘: request}
"""
ser = BookDetailSerializer(
instance=obj,many=False,
context={‘request‘: request}
)
"""
如果出现关联关系时,获取model对像的某一个字段
"""
bookname = serializers.CharField(source=‘book.bookname‘)
"""
第二种继承自:serializers.ModelSerializer
"""
class ChpaterDetailSerializer(serializers.ModelSerializer):
#使用ModelSerializer进行章节详情的序列化
bookname = serializers.CharField(source=‘book.bookname‘)
class Meta:
model = models.ChpaterInfo
#fields = "__all__"
fields = [‘id‘,‘bookname‘]
"""
DRF (序列化时)自定义方法获取数据
"""
book = serializers.SerializerMethodField()
"""
"""
def get_book(self,row):
""" row - > UserInfo"""
print(‘======‘,row.book.all())
ser = UsersBooksSerializer(
instance=row.book.all(),
many=True
)
return ser.data
"""
DRF depth深度的使用
# depth会根据关联的数据不停的深入将数据获取出来(最多不超过10层)
# depth = 1
"""
class UsersSerializer(serializers.ModelSerializer):
class Meta:
model = models.UserInfo
fields = "__all__"
#depth会根据关联的数据不停的深入将数据获取出来(最多不超过10层)
depth = 1
"""
DRF序列化的验证功能
"""
class UsersSerializer(serializers.ModelSerializer):
#自定义验证错误的信息
username = serializers.CharField(error_messages={‘required‘:‘用户名不能为空‘})
class Meta:
model = models.UserInfo
fields = "__all__"
"""
"""
class UsersView(APIView):
def post(self,request,*args,**kwargs):
"""DRF 序列化自带验证功能"""
data = request.data
#print(data)
ser = UsersSerializer(data=data)
if ser.is_valid(): # ser.is_valid()y验证数据的有效性
print(‘验证后的数据‘,ser.validated_data)
#验证后的数据正确后,保存数据至数据库
ser.save()
else:
#上传数据不符合规范时ser.errors,返回错误详细
print(ser.errors)
return Response(data)
"""
自定义字段验证规则
"""
class UsersInfoSerializer(serializers.ModelSerializer):
username = serializers.CharField(error_messages={‘required‘:‘用户名不能为空‘})
class Meta:
model = models.UserInfo
fields = "__all__"
# 用户名中必须包含老王两个字,不包含则认为名字无效
def validate_username(self,validated_value):
print(validated_value)
from rest_framework.exceptions import ValidationError
if ‘老王‘ not in validated_value:
#验证不通过,抛出异常
raise ValidationError(‘用户名不合法‘)
#验证通过,返回数据
return validated_value
"""
文章标题:Python学习————drf各类组件的用法和作用
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