如何在swift中将[String:[Object]]的字典保存到Firebase

将字典从类型[String:[object]]保存到firebase的最佳方法是什么

对象类是：

class Product {

let name:String
var cost:Double
let image:UIImage
var quantity:Int

init(name:String,cost:Double,imageName:String)
{
    self.name=name
    self.cost=cost
    self.image = UIImage(named: imageName)!
    self.quantity = 0
}
init()
{
    self.name=""
    self.cost=0
    self.image = UIImage()
    self.quantity=0
}

}

谢谢