class MultipleTypedChoiceModelField(models.Field): """ Saving value of all the checked checkboxes in the string """ def get_internal_type(self): return 'MultipleTypedChoiceModelField' def get_prep_value(self, value): # In typical cases, you do not need to call additional methods, # as incoming list already contains strings. unicoded_val = [val.__unicode__() for val in value] return ', '.join(unicoded_val)