Django-GenericAPIView 和mixins实现增删改查

1.GenericAPIView 和mixins 的使用：

1.1 在 user/urls.py 中添加路由

from django.contrib import admin
from django.urls import path
from dayapp.views import *

urlpatterns = [
    path('admin/', admin.site.urls),
    path('cate', CateView.as_view()),
    path('cate/<int:pk>/', CateInfoView.as_view()),#修改和删除重新写一个视图
    path('good', GoodView.as_view()),
    path('good/<int:pk>/', GoodInfoView.as_view()),#修改和删除重新写一个视图
]

1.2创建user/serializers.py写序列化器

from rest_framework import serializers
from .models import *
from rest_framework.validators import ValidationError


class Cateser(serializers.ModelSerializer):
    class Meta:
        model = Cate
        fields = '__all__'


class Goodser(serializers.ModelSerializer):
    # 自定义验证上传图片
    pic = serializers.ImageField(use_url=False)

    def validate_pic(self, file):
        # 获取文件名 大小
        name = file.name
        size = file.size  # 大小返回的单位是字节数
        print(name, size)  # 打印文件名 文件大小

        if size > 2 * 1024 * 1024:
            raise ValidationError('文件大小超过2M')  # 抛出异常
        else:
            pass
        if name.split(".")[-1] not in ("jpg", "jpeg"):
            raise ValidationError('文件格式不是jpg或jpeg')  # 抛出异常
        return file

    class Meta:
        model = Good
        fields = '__all__'

1.3 在 user/views.py 中添加视图函数

from rest_framework.generics import GenericAPIView
from rest_framework.mixins import ListModelMixin,CreateModelMixin,
RetrieveModelMixin, UpdateModelMixin, DestroyModelMixin
from .sers import *

# 导入列表分页类
from rest_framework.pagination import PageNumberPagination
from rest_framework.response import Response


class CateView(GenericAPIView, ListModelMixin, CreateModelMixin):
    queryset = Cate.objects.all()
    serializer_class = Cateser

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

    def post(self, request):	#增加
        response = self.create(request)
        return response


class CateInfoView(GenericAPIView, RetrieveModelMixin, UpdateModelMixin, DestroyModelMixin):
    queryset = Cate.objects.all()
    serializer_class = Cateser

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

    def put(self, request, pk):	#修改
        return self.partial_update(request)  # partial_update 部分更新

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

#自定义分页
class BookPage(PageNumberPagination):
    page_size = 3  # 设置 一页 大小
    page_query_param = 'p'  # 重新配置页码的参数名

    def get_paginated_response(self, data):  # data 是本页的数据
        # 我们需要返回 上一页页码 下一页页码  当前页的数据 还有总页数
        number = self.page.number  # 当前页数
        page_nums = self.page.paginator.num_pages  # 总页数
        if number > 1:
            prev_number = number - 1
        else:
            prev_number = None
        if number < page_nums:
            next_number = number + 1
        else:
            next_number = None

        resp = {}
        resp['prev_number'] = prev_number
        resp['next_number'] = next_number
        resp['page_nums'] = page_nums
        resp['data'] = data

        return Response(resp)


class GoodView(GenericAPIView, ListModelMixin, CreateModelMixin):
    queryset = Good.objects.all()
    serializer_class = Goodser

    # 设置列表分页
    pagination_class = BookPage

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

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


class GoodInfoView(GenericAPIView, RetrieveModelMixin, UpdateModelMixin, DestroyModelMixin):
    queryset = Good.objects.all()
    serializer_class = Goodser

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

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

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