问题
I have a cloudkit record with 5 fields:
Active
User1
User2
User3
User4
I am trying to pick the record where one of the 4 user fields match with the userID variable.
Only one other the 4 user fields will match the userID variable.
This is the code I am using:
var userID = "0984093843897"
predicate = NSPredicate(format: "userID1 = %@ OR userID2 = %@ OR userID3 = %@ OR userID4 = %@ AND active = %@", userID, userID, userID, userID, true)
Basically what I am trying to achieve is something similar to the statement bellow:
if userID1 == userID || userID2 == userID || userID3 == userID || userID4 == userID && active = true
Unfortunatelly cloudkit is returning an error for the predicate format. I am not sure if what I am trying to do here is achievable with cloudkit predicates or if there is a better way for doing it.
Most of the examples I found here on stack deals with predicates with AND operators, not sure how to use an OR operator. Looking at Apple Docs it does not exist, so not sure if there a work around that.
回答1:
Cloud Kit's CKQuery doesn't support OR in a predicate. See the documentation for CKQuery. It shows all the supported predicate operators and while AND and NOT are supported, OR is not.
One possible replacement for OR would be IN. I've only seen this where you wish to see if a single field contains one of several values. But your case is in reverse. Try the following but it may not work.
var userID = "0984093843897"
NSPredicate(format:"%@ IN { %K, %K, %K, %K } AND active = true", userID, "userID1", "userID2", "userID3", "userID4"]
来源：https://stackoverflow.com/questions/37311758/use-of-or-operator-on-cloudkit-predicate