Trying to dynamically init the correct class based on a string

something.swift

class Entity
{
	var objectID: String?
	var createdAt: NSDate?
	var updatedAt: NSDate?
	var avatarURL: NSURL?
	var wallpaperURL: NSURL?
	
	required init()
	{
	}
	
	required init(dictionary: Dictionary<String, AnyObject>)
	{
		if let objectID = dictionary["objectId"] as? String
		{
			self.objectID = objectID
		}

		if let createdAt = dictionary["createdAt"] as? String
		{
			self.createdAt = NSDate.dateFromJSONDateString(createdAt)
		}

		if let updatedAt = dictionary["updatedAt"] as? String
		{
			self.updatedAt = NSDate.dateFromJSONDateString(updatedAt)
		}

		if let wallpaper = dictionary["avatar"] as? Dictionary<String, String>,
			urlString = wallpaper["url"],
			URL = NSURL(string: urlString)
		{
			self.avatarURL = URL
		}
		
		if let wallpaper = dictionary["wallpaper"] as? Dictionary<String, String>,
		   urlString = wallpaper["url"],
		   URL = NSURL(string: urlString)
		{
			self.wallpaperURL = URL
		}
	}
	
	func dictionaryRepresentation() -> Dictionary<String, String>
	{
		return Dictionary<String,String>()
	}

}

// Organization is also a subclass that has additional properties and the same init(dictionary:...)
	
This works:

func typeForName(name: String) -> Entity.Type
{
	if name == "Organization"
	{
		return Organization.self
	}
		
	return Entity.self
}
	
let expectedClass = self.typeForName("Organization")
let result = expectedClass.init(dictionary: resultsDictionary);