{recompute:item_ids:fields_ids}

Recomputes the computed fields on one or more items, as if those items had just been saved. A computed field is a slice field whose value is generated by an expression (its Computed insert/update function) - a counter, a slug, a cached total, an aggregate of related items. recompute re-runs those expressions and writes the fresh values back. It is most often placed inside another item own computed field, so that saving item A also refreshes a derived value on related item B (recompute a parent link count, refresh a cached sum, propagate a change down a relation). recompute produces no visible output: it returns an empty string and does its work as a side effect. The first argument is a dash-separated list of item long ids; empty entries and ids with no matching item are skipped. The optional second argument is a dash-separated list of field ids that limits the recompute to those fields - otherwise every computed field on the item is refreshed.