func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let valueToPass = jobs[indexPath.row].text; jobs[indexPath.row].addedByUser<- ERROR; jobs[indexPath.row].like(); jobs[indexPath.row].dislike()
    performSegue(withIdentifier: "toDetails", sender: valueToPass)
}

class Job {
var text: String = ""
var addedByUser: String!

init(text: String, addedByUser: String) {
    self.text = text
    self.addedByUser = addedByUser
}

init(snapshot: DataSnapshot){
    if let value = snapshot.value as? [String : Any] {
        text = value["text"] as! String
        addedByUser = value["addedByUser"] as? String
}
}

func toDictionary() -> [String : Any] {
        return [
        "text" : text,
        "addedByUser" : addedByUser,
    ]
}
}