Getting data from pointer column in Parse (iOS)

Question

I have seen the following questions. Get data from a pointer's row in Parse (ios)

and various other questions but still unable to figure out.

I have a class in Parse called 'Plumber'

As you can see the 'practiceArea' is a pointer to this class called 'PracticeArea' (mind the uppercase P in the class) So from here I want to extract the corresponding 'title' column value for the corresponding pointer. How can I do this?

This is my code so far

//
//  Directory.swift
//  plumber_main
//
//  Created by James on 13/4/16.
//  Copyright © 2016 James. All rights reserved.
//

import UIKit
import Parse

class Directory: UITableViewController {




    @IBOutlet var plumbersDirectory: UITableView!

    var profImages = [PFFile]()
    var plumberName = [String]()
    var plumberRate = [NSNumber]()
    var plumberPracArea = [PFObject]()
    var plumberExp = [String]()



    var refresher: UIRefreshControl!



    func refresh()
    {
        let query_one = PFQuery(className: "PracticeArea")
        query_one.includeKey("title")
        let query = PFQuery(className: "plumber")
        query.includeKey("practiceArea")
        query.orderByDescending("createdAt")

        query.findObjectsInBackgroundWithBlock(

            {
                (listll: [PFObject]?, error: NSError?) -> Void in

                if error == nil {
                    // The find succeeded.
                    print("Successfully retrieved \(listll!.count) names of the plumbers.")
                    // Do something with the found objects
                    if let objects = listll {
                        for object in objects {
                            print(object)

                            self.profImages.append(object["photo"] as! PFFile)
                            self.plumberName.append(object["name"] as! String)
                            self.plumberExp.append(object["expLevel"] as! String)
                            self.plumberPracArea.append(object["practiceArea"] as! PFObject)
                            print(object ["practiceArea"].objectId)
                            self.plumberRate.append(object["ratePerHr"] as! NSNumber)


                            // print(object["plumber_Name"] as! String )
                            // self.plumbersname.append(object["plumber_Name"] as! String)
                            //self.lblName.text = object["plumber_Name"] as? String

                        }
                        self.plumbersDirectory.reloadData()
                    }
                    print(self.plumberName.count)
                } else {
                    // Log details of the failure
                    print("Error: \(error!) \(error!.userInfo)")
                }
                self.tableView.reloadData()
                self.refresher.endRefreshing()
        })

    }





    override func viewDidLoad() {
        super.viewDidLoad()

        refresher = UIRefreshControl()
        refresher.attributedTitle = NSAttributedString(string: "Pull to refrehsh")
        refresher.addTarget(self, action: "refresh", forControlEvents: UIControlEvents.ValueChanged)
        self.tableView.addSubview(refresher)

        refresh()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // MARK: - Table view data source

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return 1
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
       return plumberName.count
    }

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let plumbercell: plumber_Directory_Cell = tableView.dequeueReusableCellWithIdentifier("plumberlistproto") as! plumber_Directory_Cell


        plumbercell.name.text = plumberName[indexPath.row]
        plumbercell.exp.text = plumberExp[indexPath.row]



        plumbercell.pracArea.text = String(plumberPracArea[indexPath.row])
        plumbercell.price.text = String (plumberRate[indexPath.row])
        profImages[indexPath.row].getDataInBackgroundWithBlock{(imageData: NSData?, error: NSError?) -> Void in
            if imageData != nil {
                let image = UIImage(data: imageData!)
                plumbercell.mini_image.image = image
            }
            else
            {
                print(error)
            } }

        //cell.textLabel?.text = plumbersname[indexPath.row]

        return plumbercell
    }


    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)
    {
        print(indexPath.row)
    }



}

Answer 1

Try this

    func refresh()
       {

          let query = PFQuery(className: "PracticeArea")
          query.includeKey("practiceArea")
          query.orderByDescending("createdAt")

          query.findObjectsInBackgroundWithBlock( {
                (listll: [PFObject]?, error: NSError?) -> Void in

                if error == nil {
                   // The find succeeded.
                   print("Successfully retrieved \(listll!.count) names of the plumbers.")
                   // Do something with the found objects
                   if let objects = listll {
                      self.plumberName = objects
                    } else {
                      self.plumberName.removeAllObjects()
                   }
                      self.plumbersDirectory.reloadData()

                   print(self.plumberName.count)
                } else {
                   // Log details of the failure
                   print("Error: \(error!) \(error!.userInfo)")
                }
          })

       }

       override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
          let plumbercell: plumber_Directory_Cell = tableView.dequeueReusableCellWithIdentifier("plumberlistproto") as! plumber_Directory_Cell

          let object = plumberName[indexPath.row]

          plumbercell.name.text = object["name"]
          plumbercell.exp.text = object["expLevel"]
          let practiceArea = object["practiceArea"]
          plumbercell.pracArea.text = practiceArea["title"]



          plumbercell.pracArea.text = String(plumberPracArea[indexPath.row])
          plumbercell.price.text = String (plumberRate[indexPath.row])
          profImages[indexPath.row].getDataInBackgroundWithBlock{(imageData: NSData?, error: NSError?) -> Void in
             if imageData != nil {
                let image = UIImage(data: imageData!)
                plumbercell.mini_image.image = image
             }
             else
             {
                print(error)
             } }

          //cell.textLabel?.text = plumbersname[indexPath.row]

          return plumbercell
       }

Answer 2

you should query the different class if you want to use the pointer with the "includeKey"...

let query: PFQuery = PFQuery(className: "PracticeArea")
    query.orderByDescending("createdAt")
    query.includeKey("practiceArea")
    query.findObjectsInBackgroundWithBlock{
        (objects:[PFObject]?, error:NSError?)->Void in
        if error == nil{
            for object in objects! {
                //do stuff with each object
            }
        }
    }

Answer 3

You were really close and definitely not "doing it all wrong". Since you've already included the key in the query request, when you want the information from that object too, then you just need this

let practiceArea = object["projectArea"] as! PFObject
let title = practiceArea["title"] as? String