Core Data NSPredicate: Return all objects which are related to another object whos ID appears in a g-CodePudding

My object graph looks like this

Servers <-->> Events

Each event entity has an non-optional attribute ID.

An event can only belong to one server, but a server can be related to many events

Given an array of event IDs [1, 2, 3]

I want all the Servers that have an Event who's ID appears in the given array

I tried this but I get 'unable to parse the format string'

NSPredicate(format: "SUBQUERY(events, $event, ANY $event.clientID in %@)", clientIDs as CVarArg)

CodePudding user response：

Try adding an @count to your subquery.

NSPredicate(format: "SUBQUERY(events, $event, ANY $event.clientID in %@).@count != 0", clientIDs as CVarArg)

Checkout these docs for bit of a reference.