Related items
A rollup field shows items from another collection that reference the current one — without you copying or syncing anything. Point it at a collection and a reference field, and it lists the matches live, wherever the current item is displayed: in the CMS, in a member’s account area, or on a published page.
Setting one up
Section titled “Setting one up”Add a field of type Related items to a collection, and configure:
- From — the collection to look in (for example, Works).
- Where — the reference field on that collection which points back at this one (for example, Works → Edition).
- Group by (optional) — bucket the matches by another field on the matched items.
- Limit — how many matched items to show (default 50, capped at 100).
The field always reflects the current state of the other collection — add, remove, or edit an item over there, and every rollup pointing at it updates on the next view. Nothing is stored on the item carrying the rollup field.
Where it shows up
Section titled “Where it shows up”- On a collection item in the CMS, as a read-only list of matches.
- On a member’s account area, as “my [things]” pulled from a participation collection (see Recurring editions).
- On a published page, bound into a repeater or a table like any other data source.
Example
Section titled “Example”A “2026 Edition” item gets a rollup field named Entries, set to look in Works where Edition points back at it. Opening that edition in the CMS immediately shows every work submitted to it — no manual bookkeeping, and no risk of the list going stale.
Limits
Section titled “Limits”A rollup looks one collection away — it can’t chain through a second rollup, and it can’t itself be used as a filter condition elsewhere. It is never a form input and never exported as if it were a stored column; treat it as a live view, not a value.