'Returns the default value for this field.'

def get_default(self):

    if self.has_default():
        if callable(self.default):
            return self.default()
        return force_text(self.default, strings_only=True)
    if ((not self.empty_strings_allowed) or (self.null and (not connection.features.interprets_empty_strings_as_nulls))):
        return None
    return u''
