Related to foreign key , Django

Question

I am a new user to Django, I have two models, one is Department and the other is Employee. I need to link these two tables so that I would be able to view the details under each department in a table. But I am getting an error as "NOT NULL constraint failed: pom_employee.department_id". I am not using forms in this project. Kindly help me

class Department(models.Model):
    name = models.CharField(max_length=50)

    def __str__(self):
        return self.name

class Employee(models.Model):
    name = models.CharField(max_length=124)
    age = models.IntegerField()
    department = models.ForeignKey(Department,on_delete=models.CASCADE,null=True)

    def __str__(self):
        return self.name

def empdata(request):
    if request.method == "POST":
        name = request.POST.get('empname', False)
        age = request.POST.get('empage', False)

        try:
            Employee.objects.create(name=name, age=age)

            return redirect('/showemp')
        except Employee.DoesNotExist:
            print("I am in except")
            Employee.objects.get(name=name, age=age).save()
    return render(request, 'showempdetails.html')

Answer 1

You can try this one. If it gives any error then let me know what it says:

class Department(models.Model):
    name = models.CharField(max_length=50)

    def __str__(self):
        return self.name

class Employee(models.Model):
    name = models.CharField(max_length=124)
    age = models.IntegerField()
    department = models.ForeignKey(Department,on_delete=models.CASCADE,null=True, blank=True)

    def __str__(self):
        return self.name


views.py

    def empdata(request):
        if request.method == "POST":
            name = request.POST.get('empname')
            age = request.POST.get('empage')
            
            try:
                emp = Employee(name=name, age=age)
                emp.save()
                return redirect('/showemp')
            except Employee.DoesNotExist:
                print("I am in except")
        return render(request,'showempdetails.html')

You can delete your old migrations and run again new migrations.

Answer 2

if you want blank then don't use cascade

    department = models.ForeignKey(Department,on_delete=models.CASCADE,null=True, blank=True)

change

    department = models.ForeignKey(Department,null=True, blank=True)