As I continue working on the new product management app, I was trying to get a quick CoreData count. To be precise, I needed to get the count for how many of its relationships met a given criteria. There’s quite a few approaches but none as clean as “the filter”:
Using it for boolean arguments:
entity.childOfEntity?.filter({ ($0 as! entityType).booleanAgument != true}).count
Using the image example above:
noteObject.tasksOfNote?.filter({ ($0 as! Task).completed != true}).count
Using it for string arguments:
entity.childOfEntity?.filter({ ($0 as! entityType).stringArgument != ”Something“}).count
Definitely recommended it for most CoreData relationship work, simplifies things quite a bit.
Marc