struct GroceryList {

let ref: DatabaseReference?
let key: String
let groceryListName: String

init(groceryListName: String, key: String = "") {
    self.ref = nil
    self.key = key
    self.groceryListName = groceryListName
}

init?(snapshot: DataSnapshot) {
    guard
    let value = snapshot.value as? [String: AnyObject],
        let groceryListName = value["groceryListName"] as? String else { return nil }

    self.ref = snapshot.ref
    self.key = snapshot.key
    self.groceryListName = groceryListName
}

func toAnyObject() -> Any {

    return ["groceyListName": [Items.toAnyObject]]
}

struct Items {

let ref: DatabaseReference?
let key: String
let product: String
let price: String
var completed: Bool


init(product: String, price: String, completed: Bool, key: String = "") {
    self.ref = nil
    self.key = key
    self.product = product
    self.price = price
    self.completed = completed

}

init?(snapshot: DataSnapshot) {
    guard
        let value = snapshot.value as? [String: AnyObject],
        let product = value["product"] as? String,
        let price = value["price"] as? String,
        let completed = value["completed"] as? Bool else { return nil }

    self.ref = snapshot.ref
    self.key = snapshot.key
    self.product = product
    self.price = price
    self.completed = completed
}

func toAnyObject() -> Any {
    return ["product": product,
            "price": price,
            "completed": completed
        ]
}