python Django Rest_Framework框架五个视图扩展类详解（图文并茂版）

Posted 2022-04-14 温柔且上进c

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五个视图扩展类详解

介绍

介绍

扩展类也叫混入类（Mixin）

作用：

提供了对数据资源进行增删改查的五种后端视图，当需要做出的操作数据此五种，可以通过继承相应的扩展类来复用代码，减少自己编写的代码量
这五个扩展类需要搭配GenericAPIView通用视图基类一起使用，因为五个扩展类的实现需要调用GenericAPIView提供的序列化器与数据库查询的方法
下述操作的数据模型均为前面博客中的同一模型，python Django Rest_Framework框架 APIView介绍与序列化器详解（图文并茂版）

ListModelMixin（列表视图扩展类）

列表视图扩展类，提供**list(request, *args, kwargs)方法快速实现列表视图，返回200状态码
该Mixin的list方法可以对数据进行过滤和分页
代码实现：

from rest_framework import status
from rest_framework.generics import GenericAPIView
from rest_framework.mixins import ListModelMixin
from rest_framework.response import Response
from rest_framework.views import APIView

from .models import Students
from .serilizers import StudentsSerializers, StudentModelSerializers


class StudentView(GenericAPIView, ListModelMixin):
    """ListModelMixin：展示全部数据"""
    queryset = Students.objects.all()
    serializer_class = StudentModelSerializers

    def get(self, request):
        return self.list(request)

路由：

from django.urls import path, re_path

from . import views

urlpatterns = [
    # 基出序列化器
    # 多数据操作
    path('students/', views.StudentsApiview.as_view()),
    # 单个数据进行操作
    re_path('students/(?P<pk>\\d+)/', views.StudentDerailApiview.as_view()),

    # 模型序列化器
    path('students1/', views.Students1Apiview.as_view()),
    re_path('students1/(?P<pk>\\d+)/', views.StudentDerail1Apiview.as_view()),

    # GenericAPIView[通用视图类]与模型序列化器
    path('students2/', views.StudentGenericAPIView.as_view()),
    re_path('students2/(?P<pk>\\d+)/', views.StudentDetailGenericAPIView.as_view()),

    # GenericAPIView[通用视图类]与扩展类
    path('students3/', views.StudentView.as_view())
]

CreateModelMixin（创建视图扩展类）

创建视图扩展类，提供**create(request, *args, kwargs)方法快速实现创建资源的视图，成功返回201状态码
如果序列化器对前端发送的数据验证失败，返回400错误
代码实现：

from rest_framework import status
from rest_framework.generics import GenericAPIView
from rest_framework.mixins import ListModelMixin, CreateModelMixin
from rest_framework.response import Response
from rest_framework.views import APIView

from .models import Students
from .serilizers import StudentsSerializers, StudentModelSerializers


class StudentView(GenericAPIView, ListModelMixin, CreateModelMixin):
    """ListModelMixin：展示全部数据"""
    queryset = Students.objects.all()
    serializer_class = StudentModelSerializers

    def get(self, request):
        return self.list(request)

    def post(self, request):
        return self.create(request)

路由与上一个扩展类相同

RetrieveModelMixin（详情视图扩展类）

详情视图扩展类，提供**retrieve(request, *args, kwargs)方法，可以快速实现返回一个存在的模型数据对象
如果存在，返回200状态码，否则返回404状态码
代码实现：

from rest_framework import status
from rest_framework.generics import GenericAPIView
from rest_framework.mixins import ListModelMixin, CreateModelMixin, RetrieveModelMixin, UpdateModelMixin
from rest_framework.response import Response
from rest_framework.views import APIView

from .models import Students
from .serilizers import StudentsSerializers, StudentModelSerializers


class StudentDetailView(GenericAPIView, RetrieveModelMixin):
    """RetrieveModelMixin：查看一个存在的数据对象
    """
    queryset = Students.objects.all()
    serializer_class = StudentModelSerializers

    def get(self, request, pk):
        return self.retrieve(request, pk)

路由文件：

# @Time: 2022/4/6-10:02
# @User: Ycx
from django.urls import path, re_path

from . import views

urlpatterns = [
    # 基出序列化器
    # 多数据操作
    path('students/', views.StudentsApiview.as_view()),
    # 单个数据进行操作
    re_path('students/(?P<pk>\\d+)/', views.StudentDerailApiview.as_view()),

    # 模型序列化器
    path('students1/', views.Students1Apiview.as_view()),
    re_path('students1/(?P<pk>\\d+)/', views.StudentDerail1Apiview.as_view()),

    # GenericAPIView[通用视图类]与模型序列化器
    path('students2/', views.StudentGenericAPIView.as_view()),
    re_path('students2/(?P<pk>\\d+)/', views.StudentDetailGenericAPIView.as_view()),

    # GenericAPIView[通用视图类]与扩展类
    path('students3/', views.StudentView.as_view()),
    re_path('students3/(?P<pk>\\d+)/', views.StudentDetailView.as_view()),

]

UpdateModelMixin（更新视图扩展类）

更新视图扩展类，提供**update(request, *args, kwargs)方法，可以快速实现更新一个存在的数据对象
同时也提供**partial_update(request, *args, kwargs)方法，可以实现局部更新
成功返回200状态码，序列化器校验数据失败时，返回400错误状态码
代码实现：

from rest_framework import status
from rest_framework.generics import GenericAPIView
from rest_framework.mixins import ListModelMixin, CreateModelMixin, RetrieveModelMixin, UpdateModelMixin
from rest_framework.response import Response
from rest_framework.views import APIView

from .models import Students
from .serilizers import StudentsSerializers, StudentModelSerializers


class StudentDetailView(GenericAPIView, RetrieveModelMixin, UpdateModelMixin):
    """RetrieveModelMixin：查看一个存在的数据对象
    """
    queryset = Students.objects.all()
    serializer_class = StudentModelSerializers

    def get(self, request, pk):
        return self.retrieve(request, pk)

    def put(self, request, pk):
        return self.update(request, pk)

查看是否修改成功

DestroyModelMixin（删除视图扩展类）

删除视图扩展类，提供**destroy(request, *args, kwargs)方法，可以快速实现删除一个存在的数据对象
成功返回204状态码，不存在返回404状态码
代码实现：

from rest_framework import status
from rest_framework.generics import GenericAPIView
from rest_framework.mixins import ListModelMixin, CreateModelMixin, RetrieveModelMixin, UpdateModelMixin, 
    DestroyModelMixin
from rest_framework.response import Response
from rest_framework.views import APIView

from .models import Students
from .serilizers import StudentsSerializers, StudentModelSerializers


class StudentDetailView(GenericAPIView, RetrieveModelMixin, UpdateModelMixin, DestroyModelMixin):
    """RetrieveModelMixin：查看一个存在的数据对象
       UpdateModelMixin：更新一个存在的数据对象
       DestroyModelMixin：删除一个存在的数据对象
    """
    queryset = Students.objects.all()
    serializer_class = StudentModelSerializers

    def get(self, request, pk):
        return self.retrieve(request, pk)

    def put(self, request, pk):
        return self.update(request, pk)

    def delete(self, request, pk):
        return self.destroy(request, pk)