Review query

func writeToDB(UID: String, restName: String, numberOfDiners: Int, experience: String, goBack: String, dishInfo: [(String, Double, String, String)]) {

    let restPath = "restaurant/" + restName + "/reviews"
    let dishPath = "menu/" + restName + "/"
    let reviewPath = "review data/" + restName + "/" + UID

    Database.database().reference().child(restPath).setValue([UID: experience])
    Database.database().reference().child(reviewPath).setValue(["Number of Diners": numberOfDiners, "Would you go back": goBack])

    for dish in dishInfo {
        Database.database().reference().child(dishPath).observeSingleEvent(of: .value) { snapshot in
            if (snapshot.hasChild(dish.0)) {
                let newSnap = snapshot.childSnapshot(forPath: dish.0)
                if (newSnap.hasChild(UID)) {
                    Database.database().reference().child(dishPath + dish.0 + "/user reviews/" + UID).setValue(["rating": dish.1, "text review": dish.2, "image": dish.3])
                } else {
                    Database.database().reference().child(dishPath + dish.0 + "/user reviews/").setValue([UID: ["rating": dish.1, "text review": dish.2, "image": dish.3]])
                }
            } else {
                print("This dish does not exist in our DB!")
            }
        }
    }
}