Swift NSPredicate, first name AND last name NSCompoundPredicate? - swift

Question

In my code below I am using NSPredicates specifically I am using NSCompoundPredicate to check for multiple different parameters in my search function. How would I go about searching with both the First Name AND Last Name, I am currently using AND but it does not return anything in my UITableView. All my other predicates listed in the compound predicate work great.
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
textInSearchField = searchBar.text!
if searchBar.text == ""{
print("Searching for all clients.")
retrieveClients()
view.endEditing(true)
clientTableView.reloadData()
}else{
print("Enter a client name to search.")
isFilteringSearch = true
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let context = appDelegate.persistentContainer.viewContext
let firstAndLast = NSPredicate(format: "firstName = %# AND lastName = %#", textInSearchField)
let firstNamePredicate = NSPredicate(format: "firstName = %#", textInSearchField)
let lastNamePredicate = NSPredicate(format: "lastName = %#", textInSearchField)
let idPredicate = NSPredicate(format: "id = %#", textInSearchField)
let orPredicate = NSCompoundPredicate(type: NSCompoundPredicate.LogicalType.or, subpredicates: [firstAndLast,firstNamePredicate, lastNamePredicate, idPredicate])
clientsEntity.predicate = orPredicate
clients = try! context.fetch(clientsEntity) as! [NSManagedObject]
view.endEditing(true)
clientTableView.reloadData()
}
}
Something to bear in mind is that I still need to be able to use
LogicalType.or since I want to have the option for the user to search by first name, last name but also a combination of both for example Harold Finch or Finch/Harold etc.
Cheers!

Answer 1

let firstAndLast = NSPredicate(format: "firstName = %# AND lastName = %#", textInSearchField)
let firstNamePredicate = NSPredicate(format: "firstName = %#", textInSearchField)
let lastNamePredicate = NSPredicate(format: "lastName = %#", textInSearchField)
let idPredicate = NSPredicate(format: "id = %#", textInSearchField)
let orPredicate = NSCompoundPredicate(type: NSCompoundPredicate.LogicalType.or, subpredicates: [firstAndLast,firstNamePredicate, lastNamePredicate, idPredicate])
I hope that for orPredicate, it should be [firstAndLast, idPredicate] instead, but you didn't make it work. Else you need to rethink about it, that's your orPredicate current logic:
if ((a == x AND b == x) OR (a == x) OR (b == x) OR (c = x)) {
}
The (a == x AND b == x) is useless.
There is an issue on that line:
let firstAndLast = NSPredicate(format: "firstName = %# AND lastName = %#", textInSearchField)
You have two placeholders (%#), but only one argument (textInSearchField).
let firstAndLast = NSPredicate(format: "firstName = %# AND lastName = %#", textInSearchField, textInSearchField)

Answer 2

Thank for the help, I ended up using an alternative method with contains[c] my code is below for anyone who needs help with a similar function, you can use contains[c](contains character) to search via character specifically this applies to all strings i.e first name or last name and in my case also an ID which is stored as a String also.
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
textInSearchField = searchBar.text!
if searchBar.text == ""{
retrieveClients()
view.endEditing(true)
clientTableView.reloadData()
}else{
isFilteringSearch = true
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let context = appDelegate.persistentContainer.viewContext
let words = textInSearchField.components(separatedBy: " ")
for word in words{
if (word).count == 0{
continue
}
let firstNamePredicate = NSPredicate(format: "firstName contains[c] %#", word)
let lastNamePredicate = NSPredicate(format: "lastName contains[c] %#", word)
let idPredicate = NSPredicate(format: "id contains[c] %#", word)
let orPredicate = NSCompoundPredicate(type: NSCompoundPredicate.LogicalType.or, subpredicates: [firstNamePredicate, lastNamePredicate, idPredicate])
clientsEntity.predicate = orPredicate
}
clients = try! context.fetch(clientsEntity) as! [NSManagedObject]
view.endEditing(true)
clientTableView.reloadData()
}
}
I followed the second answer on this post NSPredicate: Combine CONTAINS with IN
Thank You