Django异常处理的推荐方式Http404

一般我们在定义视图的时候，会做各种数据校验，并进行捕获后以JsonResponse进行返回，在django中有一种推荐的方式是直接抛出异常，该异常django会自动进行处理

一、引用方式

from django.http import Http404

二、使用方法

示例：

from django.http import JsonResponse, Http404
from django.views import View
from django.db import connection
from .models import Projects
from .serializers import ProjectsModelSerializer


class ProjectsPage(View):
    '''
    类视图
    '''

    def get_object(self, pk):
        try:
            obj = Projects.objects.get(id__exact=pk)
        except Exception as e:
            raise Http404("参数错误")
        return obj

    def get(self, request, pk=None):
        if pk:
            obj = self.get_object(pk)
            serializer_obj = ProjectsModelSerializer(instance=obj)
            return JsonResponse({'code': 0, 'res': "success", 'msg': serializer_obj.data})
        else:
            qs = Projects.objects.all()
            serializer_obj = ProjectsModelSerializer(instance=qs, many=True)
            return JsonResponse({'code': 0, 'res': "success", 'msg': serializer_obj.data}, safe=False)

验证结果：