django rest_framework custom exception error

Question

I'm new to django rest_framework, And tried to create customized error reponse in django!.

After going through that, all seems to be pretty straight forward, but the import error raise when i try to add the custom exception.

Settings.py

REST_FRAMEWORK = {
    'EXCEPTION_HANDLER': 'project.restapi.utils.custom_exception_handler'
}

ImportError Exception Value:
Could not import 'project.restapi.utils.custom_exception_handler' for API setting 'EXCEPTION_HANDLER'. AttributeError: module 'project.restapi.utils' has no attribute 'custom_exception_handler'

custom_exception_handler.py

from rest_framework.views import exception_handler

def custom_exception_handler(exc, context):
    # Call REST framework's default exception handler first,
    # to get the standard error response.
    response = exception_handler(exc, context)

    # Now add the HTTP status code to the response.
    if response is not None:
        response.data['status_code'] = response.status_code

    return response

model.py

class Users(viewsets.ModelViewSet):
    queryset = User.objects.all()
    serializer_class = UserSerializer

    def retrieve(self, request, *args, **kwargs):
        # call the original 'list' to get the original response
        response = super(Users, self).retrieve(request, *args, **kwargs) 

        response.data = {"collection": {"data": response.data},"statusCode":response.status_code,"version":"1.0"}
        # customize the response data
        if response is not None:
            return response
        else:
            # return response with this custom representation
            response.data = {"collection": {"data": response.data},"statusCode":response.status_code,"version":"1.0","error":response.exception}
            return response

So on the above model works fine, except when i try to hit the user which is not in the database should raise error - not found, so i tried to customise the not found to be meaningful to my own. that's it

I tried to sort out, but hard to do so!!,

Django Version: 2.1.5 Python - 3.7.0

This is probably an import/module problem. You should include on the question the contents of project.restapi.utils. Without that it's hard to tell what the problem is. You probably need to have an __init__.py file on that folder and import custom_exception_handler there. — cristiano2lopes
– cristiano2lopes, Commented Feb 17, 2019 at 17:03

mehamasum · Accepted Answer · 2019-02-17 17:59:17Z

4

Since your custom_exception_handler resides in a file named custom_exception_handler.py. You can try changing the EXCEPTION_HANDLER setting to this:

REST_FRAMEWORK = {
    'EXCEPTION_HANDLER': 'project.restapi.utils.custom_exception_handler.custom_exception_handler'
}

answered Feb 17, 2019 at 17:59

mehamasum

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2 Comments

mehamasum Over a year ago

DRF's setting implementation would try to import custom_exception_handler function (i.e. the part after the last dot) from project.restapi.utils.custom_exception_handler. In your attempt it was trying to import custom_exception_handler function from project.restapi.utils.

EngineSense Over a year ago

(val, setting_name, e.__class__.__name__, e) this actually matters a lot!!

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