Swimlanes

php

->swimlanes(Member::class)

The foreign key is inferred from Task::member(). Set it when it isn't:

php

->swimlaneAttribute('owner_id')

Dragging across rows reassigns the card.
Cards without a lane collect in an Unassigned row.
People can hide lanes, isolate one with Only, collapse rows, or switch lanes off with Display → No grouping.

Board without grouping

Swimlanes ​