DRF 使用序列化器验证正文并序列化响应

Question

我在 django 中有以下视图，它登录用户并在使用序列化程序序列化用户数据后发回响应。

@api_view(['POST'])
def sign_in(request):
    username = request.data['username']
    password = request.data['password']
    user = authenticate(username=username, password=password)

    if user is not None:
        update_last_login(None, user)  # update the user's last login date
        serializer = UserSignInSerializer(user)
        return Response(serializer.data)

    return Response('Invalid login credentials', status=401)

我不喜欢这个视图的地方是我直接从正文中提取用户名和密码的方式。我想使用相同的序列化程序来检查正文是否有效。这是可能的还是我必须创建一个新的序列化程序来验证请求？这是现有的序列化程序：

class UserSignInSerializer(serializers.ModelSerializer):

    class Meta:
        model = User
        fields = ['first_name', 'last_name', 'email', 'username', 'profile']

Answer 1

您可以使用 django rest 框架中的object level validation。这是一个不错的代码，您可以从django rest auth 使用。我在这里给你一个例子：

class LoginSerializer(serializers.Serializer):
    username = serializers.CharField(required=False, allow_blank=True)
    password = serializers.CharField(style={'input_type': 'password'})

    def authenticate(self, **kwargs):
        return authenticate(self.context['request'], **kwargs)

    def _validate_username(self, username, password):
        user = None

        if username and password:
            user = self.authenticate(email=email, password=password)
        else:
            msg = _('Must include "username" and "password".')
            raise exceptions.ValidationError(msg)

        return user

    def validate(self, attrs):
        username = attrs.get('username')
        password = attrs.get('password')
        user = self._validate_username(username, password)
        if user:
            if not user.is_active:
                msg = _('User account is disabled.')
                raise exceptions.ValidationError(msg)
        else:
            msg = _('Unable to log in with provided credentials.')
            raise exceptions.ValidationError(msg)

        attrs['user'] = user
        return attrs

并在视图中使用此序列化程序：

@api_view(['POST'])
def sign_in(request):
    serializer = LoginSerializer(data=request.data, context={'request': request})
    if serializer.is_valid():
        user = serializer.validated_data['user']
        update_last_login(None, user)  # update the user's last login date
        u_serializer = UserSignInSerializer(user)
        return Response(u_serializer.data)

    return Response(serializer.errors, status=401)