Property default values based on another property's value - ios

Question

In Realm,
Is it possible to set the default value of a persisted property, based on the value of another property?
For example. I have a name property that includes UpperCase/LowerCase/Accents/etc. I want to have a tokenizedName that transforms the name property into a more simple string (all undercase, no accents).

Answer 1

You could easily do this with derived properties:
class Person: Object {
var name: String {
get {
return _name
}
set {
_name = newValue
// perform tokenization...
tokenizedName = _name.lowercaseString
}
}
private dynamic var _name = ""
dynamic var tokenizedName = ""
override class func ignoredProperties() -> [String] { return ["name"] }
}
Here _name and tokenizedName are properties persisted in Realm, while name is ignored. Every time you read from name, you're just from its underlying storage. Every time you write to name, you set its backing storage and update the tokenized version.
Edit: In Objective-C
#interface Person : RLMObject
#property (nonatomic, copy) NSString *name;
#property NSString *_name;
#property NSString *tokenizedName;
#end
#implementation Person
- (NSString *)name {
return self._name;
}
- (void)setName:(NSString *)name {
self._name = name;
// perform tokenization...
self.tokenizedName = name.lowercaseString;
}
+ (NSArray<NSString *> *)ignoredProperties {
return #[#"name"];
}
#end