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You can access the serializer context:
def get_sources(self, category):
num_parameter = self.context['request'].query_params['num']
sources = category.source_set.filter(amount=num_parameter)
In your case, you need to pass the context when instantiating the serializer:
CategorySerializers(category, many=True, context={'request': request})
This is usually done automatically when using generic GenericAPIViews.
Source:stackexchange.com