def get_last_text_sender()

in phones/models.py [0:0]

• 22 lines of code
• 10 McCabe index (conditional complexity)

def get_last_text_sender(relay_number: RelayNumber) -> InboundContact | None:
    """
    Get the last text sender.

    MPP-2581 introduces a last_text_date column for determining the last sender.
    Before MPP-2581, the last_inbound_date with last_inbound_type=text was used.
    During the transition, look at both methods.
    """
    try:
        latest = InboundContact.objects.filter(
            relay_number=relay_number, last_text_date__isnull=False
        ).latest("last_text_date")
    except InboundContact.DoesNotExist:
        latest = None

    try:
        latest_by_old_method = InboundContact.objects.filter(
            relay_number=relay_number, last_inbound_type="text"
        ).latest("last_inbound_date")
    except InboundContact.DoesNotExist:
        latest_by_old_method = None

    if (latest is None and latest_by_old_method is not None) or (
        latest
        and latest_by_old_method
        and latest != latest_by_old_method
        and latest.last_text_date
        and latest_by_old_method.last_inbound_date > latest.last_text_date
    ):
        # Pre-MPP-2581 server handled the latest text message
        return latest_by_old_method

    return latest