iOS Realm Filter objects in a list of a relationship

Question

I have three objects nested via lists like this:

class Canteen: Object {

        dynamic var name: String?
        let lines = List()
}

class L         


        

Answer 1

Try this:

let predicate = NSPredicate(format: "name == %@", "")
var canteens: [Canteen] = realm.objects(Canteen).filter(predicate).map { can in
    // Iterate through all the Canteens
    let lines: [Line] = can.lines.map { (line: Line) in
        // Iterate through all the lines in each canteene
        // Filter all the Meals that are NOT vegan
        let meals = line.meals.filter { $0.vegan == true }
        line.meals = List(meals)
        return line
    }
    can.lines = List(lines)
    return can
}