我试图创建一个 db usign python 和 django 并有一个方法“DELETE”，它不执行并在邮递员中返回错误 500

Question

刚接触python编程，Django SQL，尝试创建一个DB，用Postman和SQLLiteStudio验证！ 使用 Django 创建 DB 和 python (3.9.6)。当我运行 DELETE 方法时，在 postman 中返回错误 500 而不执行 DELETE。 {在我的 cmd 中我没有看到任何错误消息}

观看次数：

from django.shortcuts import render
from django.views.decorators.csrf import csrf_exempt
from rest_framework.parsers import JSONParser
from django.http.response import JsonResponse 

from EmployeeApp.models import Departments,Employees
from EmployeeApp.serializers import DepartmentSerializer,EmployeeSerializer 

# Create your views here.
@csrf_exempt
def departmentApi(request,id=0):
    if request.method=='GET':
        departments = Departments.objects.all()
        departments_serializer = DepartmentSerializer(departments, many=True)
        return JsonResponse(departments_serializer.data, safe=False)

    elif request.method=='POST':
        department_data=JSONParser().parse(request)
        department_serializer = DepartmentSerializer(data=department_data)
        if department_serializer.is_valid():
            department_serializer.save()
            return JsonResponse("Added Successfully!!" , safe=False)
        return JsonResponse("Failed to Add.",safe=False)
    
    elif request.method=='PUT':
        department_data = JSONParser().parse(request)
        department=Departments.objects.get(DepartmentId=department_data['DepartmentId'])
        department_serializer=DepartmentSerializer(department,data=department_data)
        if department_serializer.is_valid():
            department_serializer.save()
            return JsonResponse("Updated Successfully!!", safe=False)
        return JsonResponse("Failed to Update.", safe=False)

    elif request.method=='DELETE':
        department=Departments.objects.get(DepartmentId=id)
        department.delete()
        return JsonResponse("Deleted Succeffully!!", safe=False)    

型号：

from Django.DB import models

class Departments(models.Model):
    DepartmentId = models.AutoField(primary_key=True)
    DepartmentName = models.CharField(max_length=100)

class Employees(models.Model):
    EmployeeId = models.AutoField(primary_key=True)
    EmployeeName = models.CharField(max_length=100)
    Department = models.CharField(max_length=100)
    DateOfJoining = models.DateField()
    PhotoFileName = models.CharField(max_length=100)

序列化程序：

from rest_framework import serializers
from EmployeeApp.models import Departments, Employees

class DepartmentSerializer(serializers.ModelSerializer):
      class Meta:
            model=Departments
            fields=('DepartmentId','DepartmentName')


class EmployeeSerializer(serializers.ModelSerializer):
      class Meta:
            model=Employees
            fields=('EmployeeId',
            'EmployeeName',
            'Department',
            'DateOfJoining',
            'PhotofileName') ```