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?
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
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