Passing data from one table to the other on PARSE - pointers

Question

everyone been trying to get data from one table using pointers, example User table and songs table, when you tap on a user it displays list of songs in the songs table specific to that users object id i tried using this method but i get an error query.wherekey("" equalTo: (PFUser.current()?.objectId!)!)
HERE IS MY CODE
var users = [""]
var userIDs = [""]
var isFollowing = ["" : true]
override func viewDidLoad() {
super.viewDidLoad()
//load user query
let query = PFUser.query ()
query?.findObjectsInBackground(block: { (objects, error) in
if error != nil {
print(error!)
} else if let users = objects {
for objects in users {
if let user = objects as? PFUser {
self.users.append(user.username!)
self.userIDs.append(user.objectId!)
let query = PFQuery(className: "Followers")
query.whereKey("Follower", equalTo: (PFUser.current()?.objectId!)!)
query.whereKey("Following", equalTo: user.objectId!)
query.findObjectsInBackground(block: { (objects, error) in
if let objects = objects {
if objects.count > 0 {
self.isFollowing[user.objectId!] = true
} else {
self.isFollowing[user.objectId!] = false
}
if self.isFollowing.count == self.users.count {
self.tableView.reloadData()
}
}
})
}
}
}
})
Thank You All
**HERE IS MY CODE FOR THE FIRST VIEW WHERE I AM ABLE TO GET ALL USERS AND SEGUE TO ANOTHER TABLE VIEW CONTROLLER**
//
// users.swift
//
//
// Created by Nawir on 1/17/17.
// Copyright © 2017 Nawir. All rights reserved.
//
import Foundation
import Parse
class artistsviewcontroller: UITableViewController {
var users = [""]
var userIDs = [""]
override func viewDidLoad() {
super.viewDidLoad()
//updating users array
let query = PFUser.query ()
query?.findObjectsInBackground(block: { (objects, error) in
if error != nil {
print(error!)
} else if let users = objects {
for objects in users {
if let user = objects as? PFUser {
self.users.append(user.username!)
self.userIDs.append(user.objectId!)
}
}
}
self.tableView.reloadData()
})
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return users.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let Usercell = tableView.dequeueReusableCell(withIdentifier: "Cell") as! mTableViewCell
Usercell.textLabel!.text = users[indexPath.row]
return Usercell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
// print("rowtapped: \(indexPath.row)")
let ItemlistTableViewController = self.storyboard?.instantiateViewController(withIdentifier: "itemviewscont") as! itemviewscont
self.navigationController?.pushViewController(ItemlistTableViewController, animated: true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
HERE IS MY SECOND TABLEVIEWCONTROLLER
// itemviews.swift
//
//
// Created by Nawir on 1/17/17.
// Copyright © 2017 Nawir. All rights reserved.
//
import Foundation
import Parse
class itemviewscont: UITableViewController {
var users = [String: String] ()
var itemname = [String] ()
override func viewDidLoad() {
super.viewDidLoad()
//query to get all user data from parse
let query = PFUser.query()
query?.findObjectsInBackground { (objects, error) in
if let users = objects {
self.users.removeAll()
for object in users {
if let user = object as? PFUser {
// self.users = [user.objectId!]
self.users[user.objectId!] = user.username!
}
}
}
//query to make connection
let getfollow = PFQuery(className: "Mkitems")
getfollow.whereKey("user", equalTo: PFUser.current()!)
getfollow.findObjectsInBackground(block: { (objects, error) in
if let followers = objects {
for object in followers {
if let follower = object as? PFObject {
let mainuser = follower["User"]
let query = PFQuery(className: "Music")
query.whereKey("fuser", equalTo: mainuser!)
query.findObjectsInBackground(block: { (objects,error) in
if let nitems = objects {
for object in nitems {
if let nitem = object as? PFObject {
self.musicname.append(nitem["name_title"] as! String)
self.tableView.reloadData()
}
}
}
})
}
}
}
})
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return itemname.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "mscell", for: indexPath)
cell.textLabel?.text = itemname[indexPath.row]
return cell
}
//dont pass this line its the end!
}
THANK YOU ALL

Answer 1

If you searching for current user object (assuming Follower is a pointer ) then use
query.whereKey("Follower", equalTo: PFUser.current()!)
and not :
query.whereKey("Follower", equalTo: (PFUser.current()?.objectId!)!)