join aggregate "{name}" uses fn "{fn}", whic...

Warnings reference › data-router:join-aggregate-bad-fn

Identifier

data-router:join-aggregate-bad-fn

Raised by

Data Router

Since

1.84.0

What happened

A rollup-onto-parent join's aggregate map names a reducer the router does not know. The named result is omitted from the parent row - the other reducers in the map still compute - rather than the router throwing or inventing a value.

The fix

Use one of the supported fn names: count, sum, avg, min, max, distinctCount, first or last.

The smallest fix

join: { from: 'line', foreignKey: 'orderId', many: true, aggregate: { lineTotal: { field: 'amount', fn: 'sum' } } }

Reference

Covered in full at the API reference.