[SOLVED] Create complicated NSCompoundPredicate in swift 3

Create complicated NSCompoundPredicate in swift 3

I want to create a complicated NSCompoundPredicate in swift 3, however, I don't know how to do this.

Suppose I have 5 predicates (p1,p2,p3,p4,p5). I want to implement below conditions:

compound1 = (p1 AND p2 AND p3) // NSCompoundPredicate(type: .and, 
                              //subpredicates: predicates)
compound2 = (p4 AND p5) // NSCompoundPredicate(type: .and, 
                       //subpredicates: predicates)
compound3 = (compound1 OR compound2) // problem is here

fetchRequest.predicate = compound3

NSCompoundPredicate as it's second argument gets array of NSPredicates that it doesn't desire. What is the best solution?

Solution

NSCompoundPredicate inherits from NSPredicate, therefore you can pass the compound predicates created in the first steps as subpredicate to another compound predicate:

let compound1 = NSCompoundPredicate(type: .and, subpredicates: [p1, p2, p3])
let compound2 = NSCompoundPredicate(type: .and, subpredicates: [p4, p5])
let compound3 = NSCompoundPredicate(type: .or, subpredicates: [compound1, compound2])

fetchRequest.predicate = compound3