I'm trying to create a predicate with the below line, but it keeps telling me it's unable to parse the format string.
var request = NSFetchRequest(entityName: "Player")
request.predicate = NSPredicate(format: "ANY matches.bracket == %@", self)On Player's entity 'matches' is an optional to-many relationship to a Match entity. The Match entity has a to-one required attribute 'bracket' that points to a Bracket entity. I'm inside of the Bracket class with the above code, so thus the 'self' property.
I want to get all Player entities where at least one of the matches pointed to belongs to the current bracket.
What am I doing wrong here?
The problem is that "MATCHES" is a predicate keyword (used for regular expression matches), and predicate keywords are case-insensitive. Using the "%K" keypath expansion should solve the problem:
let request = NSFetchRequest(entityName: "Player")
request.predicate = NSPredicate(format: "ANY %K == %@", "matches.bracket", self)This is generally a good idea to avoid name conflicts. For more information, see Predicate Format String Syntax in the "Predicate Programming Guide".