我有两个django身份验证后端。我如何在我的特定网页上设置使用哪一个的条件？

Question

我可以在视图或settings.py中编写什么，使用哪个身份验证系统？

这是我的views.py

@require_POST
def login_view(request):
    filled_form = LoginForm(request.POST)
    if filled_form.is_valid():
        user = filled_form.get_user()
        login(request,user)
        context = { 'user': user }
        return render(request,'home.html',context)
    else:
        return HttpResponse("Does not Exist")

settings.py

AUTHENTICATION_BACKENDS =   ['accounts.backends.TeacherBackend','accounts.backends.StudentBackend']

backends.py

class StudentBackend(object):
def authenticate(self, username=None, password=None):
    print("AT STUDENT BACK")
    try:
        student = Student.objects.get(student_id=username)
    except Student.DoesNotExist:
        return None
    if student.check_password(password):
        return student
    else:
        return None


def get_user(self, student_id):
    try:
        return Student.objects.get(pk=student_id)
    except Student.DoesNotExist:
        return None


class TeacherBackend(object):
print("AT TEACHER BACK")
   def authenticate(self, username=None, password=None):
      try:
        teacher = Teacher.objects.get(email=username)
      except Teacher.DoesNotExist:
        return None
      if teacher.check_password(password):
        return teacher
      else:
        return None


   def get_user(self, teacher_id):
     try:
        return Teacher.objects.get(pk=teacher_id)
     except UsTeacherer.DoesNotExist:
        return None

请告诉我如何编写代码来决定调用哪个后端?？

请不要读堆栈溢出迫使我写更多的描述，但我无法思考，所以我写这个虚拟文本作为描述。保持冷静。提前感谢

Answer 1

您必须在登录表单中区分登录类型。一种方法是在登录表单中使用下拉框。为此，必须在登录表单中添加一个自定义字段：

在forms.py中

from django.contrib.auth.forms import AuthenticationForm

class CustomLoginForm(AuthenticationForm):
    # Choose login type
    login_type = forms.ChoiceField(
        choices=(
            ('student', 'Student'),
            ('teacher', 'Teacher')
        )
    )

在views.py中

class CustomLoginView(LoginView):
    authentication_form = CustomLoginForm

在urls.py中

url(r'^login/', CustomLoginView.as_view(redirect_authenticated_user=True), name='login')

在backends.py中

from django.core.exceptions import PermissionDenied

class StudentBackend:
    def authenticate(self, username=None, password=None):
        print("AT STUDENT BACK")
        if self.request.POST.login_type != 'student':
            return None
        try:
            student = Student.objects.get(student_id=username)
        except Student.DoesNotExist:
            raise PermissionDenied("No such student exists") # Stop executing other backends
        if student.check_password(password):
            return student
        else:
            raise PermissionDenied("Wront credentials for student")


    def get_user(self, student_id):
        try:
            return Student.objects.get(pk=student_id)
        except Student.DoesNotExist:
            return None

class TeacherBackend:
   def authenticate(self, username=None, password=None):
      print("AT TEACHER BACK")
      if self.request.POST.login_type != 'teacher':
        return None
      try:
        teacher = Teacher.objects.get(email=username)
      except Teacher.DoesNotExist:
        raise PermissionDenied("No such teacher exists")
      if teacher.check_password(password):
        return teacher
      else:
        raise PermissionDenied("Wront credentials for teacher")


   def get_user(self, teacher_id):
     try:
        return Teacher.objects.get(pk=teacher_id)
     except UsTeacherer.DoesNotExist:
        return None  

在settings.py中

AUTHENTICATION_BACKENDS =   [
    'accounts.backends.TeacherBackend',
    'accounts.backends.StudentBackend'
    # ... Any other following backends
    ]

在模板/注册/login.html中

# ... Include with other Login fields
{{ form.login_type }}   

Django按照给定的顺序检查每个后端，如果任何后端引发PermissionDenied异常，则执行将停止。因此，每种登录类型都将仅由相应的后端进行验证。