join aggregate "{name}" is not a { fn, field...

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

Identifier

data-router:join-aggregate-bad-spec

Raised by

Data Router

Since

1.84.0

What happened

A rollup-onto-parent join's aggregate entry is not the { fn, field? } object the router reduces over - it is missing a string fn (a bare value, say). The named result is omitted and the other reducers still compute.

The fix

Give each aggregate a { fn, field? } object: the reducer name and, for every fn except count, the child field.

The smallest fix

join: { from: 'line', foreignKey: 'orderId', many: true, aggregate: { lines: { fn: 'count' } } }

Reference

Covered in full at the API reference.