bradjasper/django-jsonfield — pull request #29 by z4r (2013-01-28 19:28:25+00:00)
Title: Raise ValidationError on ValueError

As discussed in [djangorestframework#628](https://github.com/tomchristie/django-rest-framework/issues/628#issuecomment-12798853):

> Converts the input value into the expected Python data type, raising django.core.exceptions.ValidationError if the data can't be converted.
Returns the converted value. Subclasses should override this.