Django snippets

class NonTimeSplitDateTimeField(forms.SplitDateTimeField):
    
    """Variation on SplitDateTimeField that does not enforce the Time to be
    required, accepting a default instead.
    
    example usage:
    
    class MonkeyForm(forms.ModelForm):

        start_date = NonTimeSplitDateTimeField(
            default_time=datetime.time(00,00,00),
            widget=widgets.AdminSplitDateTime(), required=False )
        end_date = NonTimeSplitDateTimeField(
            default_time=datetime.time(11,59,59),
            widget=widgets.AdminSplitDateTime(), required=False )
    
    """
    
    
    def __init__(self, default_time, *args, **kwargs):
        self.default_time = default_time
        return super(NonTimeSplitDateTimeField, self).__init__(
            *args, **kwargs)
        
        
    def compress(self, data_list):
        if data_list:
            # Raise a validation error if date is empty
            # (possible if SplitDateTimeField has required=False).
            if data_list[0] in EMPTY_VALUES:
                raise ValidationError(self.error_messages['invalid_date'])
            if data_list[1] in EMPTY_VALUES:
                # Rather than raising an error (as super does) use the
                # default time passed in the constructor
                data_list[1] = self.default_time
            return datetime.datetime.combine(*data_list)
        return None