How to filter Core Data objects with NSPredicate based on array

Question

Let's say I have some data inside Core Data based on the following object:

class TestObject {
   var name: String
   var type: String
}

type can have one of the following names: "red", "green", "blue", "black".

Now I want to filter my data not based on one type, but an array of types, something like this:

public static func typePredicate(types: [String]) -> NSPredicate {

    return NSPredicate(format: "type == %@", types) // this line should test for an array of types, not one type
}

Is this possible to do with NSPredicate ?

You're looking for the IN keyword. Ex. ("type IN %@", types); Here's a reference if you would like to read further: Using Predicates with Arrays — Jonathan
– Jonathan, Commented Dec 28, 2015 at 18:50

Suresh Kumar Durairaj · Accepted Answer · 2015-12-28 19:01:53Z

3

You could try something like below

[NSPredicate predicateWithFormat:@"ANY %K IN %@",object.field,types]

EDIT: In Swift

var types = ["Red","Blue","Green"]
var predicate : NSPredicate = NSPredicate(format: "ANY %K IN %@", 
                               argumentArray: [object.field, types])

edited Dec 28, 2015 at 19:01

answered Dec 28, 2015 at 18:56

Suresh Kumar Durairaj

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