attach({ writable: true }) needs a grid exposing grid.on and grid.edit.setCells; write-back is off for this route.

Warnings reference › data-router:writable-target

Identifier

data-router:writable-target

Raised by

Data Router

Since

1.34.0

What happened

Write-back listens to the target's committed cell:changed events through its public event surface, and this target has neither on nor edit.setCells - it is not an editable grid. The route is attached and delivers rows normally; it simply never sends anything back.

The fix

Attach a grid for a writable route. A plain handler function cannot be written back through, because there is no editing surface to listen to.

Reference

Covered in full at the API reference.