What should I do if the DRF serializer is unable to obtain parameters?

Django REST Framework (DRF) Solution for failure to obtain global verification parameters in serializer

When using DRF for serializer global verification, sometimes the validate method cannot get the expected parameters, and this article will analyze the causes and provide a solution.

Question description:

Suppose in the LoginView, use LoginSerializer to log in. When the user does not exist, LoginSerializer performs data verification, but the validate method cannot obtain code and mobile parameters.

Code example:

LoginView:

 serializer_obj = LoginSerializer(data=request.data)

LoginSerializer:

 class LoginSerializer(serializers.Serializer):
    code = serializers.CharField(write_only=True, max_length=255, required=True)
    mobile = serializers.CharField(max_length=11, min_length=11, required=True)
    # ...Other fields...

Cause of the problem:

request.data contains all request data, but LoginSerializer(data=request.data) only uses it as the data source and does not specify which fields participate in the verification. The attrs dictionary of validate method only contains fields that the serializer actually processes, while request.data may contain other undefined fields.

Solution:

Before creating LoginSerializer instance, explicitly extract the required parameters from request.data and pass them as a dictionary to the serializer:

 code = request.data.get('code')
mobile = request.data.get('mobile')
login_type = request.data.get('login_type')

serializer_obj = LoginSerializer(data={
    'code': code,
    'mobile': mobile,
    'login_type': login_type
})

In this way, the validate method can correctly access code , mobile and login_type parameters in attrs to complete global verification.

Important tips:

Be sure to check whether code , mobile and login_type keys exist in request.data . If it does not exist, request.data.get() returns None , which may result in an error. It is recommended to add null values ​​to judge:

 code = request.data.get('code')
mobile = request.data.get('mobile')
login_type = request.data.get('login_type')

If code is None or mobile is None or login_type is None:
    # Handle the situation where parameters are missing, such as returning error message Return Response({"error": "Missing parameters"}, status=status.HTTP_400_BAD_REQUEST)

serializer_obj = LoginSerializer(data={
    'code': code,
    'mobile': mobile,
    'login_type': login_type
})

Through the above modification, we can ensure that the validate method correctly obtains parameters, thereby realizing the global verification function of the DRF serializer.

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