How to use reflection with Core Data and Swift - ios

Question

I'm trying to use reflection in Swift with Core Data entities, but when I execute the following code, my reflected var has only a reference for a super class, it didn't have a reference for any of it's attributes.
func printProperties() {
let mirror = reflect(self)
for var i = 0; i < mirror.count; i++ {
let (propertyName, childMirror) = mirror[i]
println("property name: \(propertyName)")
println("property value: \(childMirror.value)")
}
}
Does anyone have some idea why this happens?
Update: As suggested by Anderson in his answer I tried another approach and ended up with this code:
func loadFromJson(json: JSON) {
for attributeKey in self.entity.attributesByName.keys {
let attributeDescription = self.entity.propertiesByName[attributeKey]!
as! NSAttributeDescription
let attributeClassName = attributeDescription.attributeValueClassName
let jsonValue = json[(attributeKey as! String)]
var attributeValue: AnyObject? = attributeDescription.defaultValue
if jsonValue.type != .Null && attributeClassName != nil {
if attributeClassName == "NSNumber" {
attributeValue = jsonValue.number!
} else if attributeClassName == "NSString" {
attributeValue = jsonValue.string!
}
}
setValue(attributeValue, forKey: (attributeKey as! String))
}
}

Answer 1

I believe that this code can help you.
I wrote this extension to make a dictionary from a NSmanagedObject and it accesses all attributes and values of the object.
extension NSManagedObject {
func toDict() -> Dictionary<String, AnyObject>! {
let attributes = self.entity.attributesByName.keys
let relationships = self.entity.relationshipsByName.keys
var dict: [String: AnyObject] = [String: AnyObject]()
var dateFormater = NSDateFormatter()
dateFormater.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
for attribute in attributes {
if self.entity.propertiesByName[attribute]!.attributeValueClassName != nil && self.entity.propertiesByName[attribute]!.attributeValueClassName == "NSDate" {
let value: AnyObject? = self.valueForKey(attribute as! String)
if value != nil {
dict[attribute as! String] = dateFormater.stringFromDate(value as! NSDate)
} else {
dict[attribute as! String] = ""
}
} else {
let value: AnyObject? = self.valueForKey(attribute as! String)
dict[attribute as! String] = value
}
}
for attribute in relationships {
let relationship: NSManagedObject = self.valueForKey(attribute as! String) as! NSManagedObject
let value = relationship.valueForKey("key") as! String
dict[attribute as! String] = value
}
return dict
}
}
I hope to have helped you.