join with a fn `localKey` needs an explicit string/fn `foreignKey`; ignoring the join.

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

Identifier

data-router:join-no-foreignkey

Raised by

Data Router

Since

1.39.0

What happened

When localKey is a field *name*, the router uses the same name on the lookup side by default. When it is a function there is no name to reuse, so the lookup side has to be named explicitly; it was not, and the join was dropped.

The fix

Add foreignKey - a field name on the lookup rows, or a function that reads one.

The smallest fix

join: { from: 'customers', localKey: (r) => r.cust.id, foreignKey: 'id', fields: ['name'] }

Reference

Covered in full at the API reference.