Getting data from pointer column in Parse (iOS) - 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 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

Answer 3

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
}
}
}