def create(self, validated_data):
"""
Override the create method to deal with duplicate questions and
other API-specific errors that can happen on Question creation.
"""
## Check to make sure there is no duplicate
hash = signature(validated_data['text'])
if Question.objects.filter(hash=hash).exists():
raise DuplicateQuestion()
## Create the model as before
return super(QuestionSerializer, self).create(validated_data)
def dedupe(self, raise_for_exceptions=False, **kwargs):
"""
Essentially a GET or CREATE method that checks if a duplicate
question already exists in the database by its hash. If
raise_for_exceptions is True, then will raise a DuplicateQuestion
exception, otherwise it will return None.
Returns question, created where created is a Boolean
"""
hash = signature(kwargs['text'])
query = self.filter(hash=hash)
if query.exists():
if raise_for_exceptions:
raise DuplicateQuestion()
return query.first(), False
return self.create(**kwargs), True
def question_normalization(sender, instance, *args, **kwargs):
instance.hash = signature(instance.text)