join has no `fields`/`select`; rows pass through unenriched.

Warnings reference › data-router:join-no-fields

Identifier

data-router:join-no-fields

Raised by

Data Router

Since

1.39.0

What happened

The join resolves - it has a source and both keys - but names nothing to copy across, so the matched lookup row contributes no columns. The rows arrive exactly as they would with no join at all, at the cost of the lookup.

The fix

Name the fields to copy: an array of names, an object mapping source name to destination name, or a function returning the extra properties.

The smallest fix

join: { from: 'customers', localKey: 'customerId', fields: { name: 'customerName' } }

Reference

Covered in full at the API reference.