I' m trying to make an instagram clone with swift, based on the Ribbit tuto. People can share photos and follow other users etc etc. I made a PFRelation between users using Parse. What i would like to do now, is to show in my WalltableViewController, only the followed users post.
I made a function to load all the post in a NSMutable array called timeLineData.
I ve even made a function to get the followed users ina NSMutableArray called followedFriends..
But i don't succeed in filtering the loading post function with followedFriends. I have this error : Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Cannot do a comparison query for type: __NSArrayM'
Here is my code :
import UIKit
import QuartzCore
class WallTableViewController: UITableViewController, UINavigationControllerDelegate {
@IBOutlet var posterAvatar: UIImageView!
override func preferredStatusBarStyle() -> UIStatusBarStyle {
return UIStatusBarStyle.LightContent
}
var timeLineData:NSMutableArray = NSMutableArray ()
var followedFriends:NSMutableArray = NSMutableArray ()
func loadUser () {
followedFriends.removeAllObjects()
var friendsRelation: AnyObject! = PFUser.currentUser().objectForKey("KfriendsRelation")
var findUser : PFQuery = friendsRelation.query()
findUser.findObjectsInBackgroundWithBlock { (objects:[AnyObject]!, error:NSError!) -> Void in
if !(error != nil) {
// The find succeeded.
println("succesfull load Users")
// Do something with the found objects
for object in objects {
self.followedFriends.addObject(object)
println("users added to userlist")
for item in self.followedFriends {
println(item) }
}
self.tableView.reloadData()
} else {
// Log details of the failure
println("error loadind user ")
}
}
}
func loadPost () {
timeLineData.removeAllObjects()
let currentUser = PFUser.currentUser()
var findPost:PFQuery = PFQuery(className: "UserPost")
findPost.whereKey("from", equalTo: followedFriends )
findPost.orderByDescending("createdAt")
findPost.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]! , error: NSError!) -> Void in
if !(error != nil) {
// The find succeeded.
println("current user post finded")
// Do something with the found objects
for object in objects {
self.timeLineData.addObject(object)
}
self.tableView.reloadData()
} else {
// Log details of the failure
println("error loadind user post")
}
}
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return timeLineData.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell:WallTableViewCell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as WallTableViewCell
let userPost:PFObject = self.timeLineData.objectAtIndex(indexPath.row) as PFObject
//define the username
var findUser:PFQuery = PFUser.query()
findUser.whereKey("objectId", equalTo: userPost.objectForKey("from").objectId)
findUser.findObjectsInBackgroundWithBlock{
(objects:[AnyObject]!, error:NSError!) -> Void in
if !(error != nil) {
if let user:PFUser = (objects as NSArray).lastObject as? PFUser {
cell.usernameLabel.text = user.username
// define avatar poster
if let avatarImage:PFFile = user["profileImage"] as? PFFile {
avatarImage.getDataInBackgroundWithBlock{(imageData:NSData!, error:NSError!)-> Void in
if !(error != nil) {
let image:UIImage = UIImage(data: imageData)
cell.posterAvatar.image = image as UIImage
cell.posterAvatar.layer.cornerRadius = 24
cell.posterAvatar.clipsToBounds = true
}
}
}
else {
cell.posterAvatar.image = UIImage(named: "Avatar-1")
cell.posterAvatar.layer.cornerRadius = 24
cell.posterAvatar.clipsToBounds = true
}
}
}
}
//define the imagepost
let imagesPost:PFFile = userPost["imageFile"] as PFFile
imagesPost.getDataInBackgroundWithBlock{(imageData:NSData!, error:NSError!)-> Void in
if !(error != nil) {
let image:UIImage = UIImage(data: imageData)
cell.imagePosted.image = image as UIImage
}
else {
println("error")
}
}
return cell
}
override func viewDidAppear(animated: Bool) {
var currentUser = PFUser.currentUser()
if (currentUser != nil) {
println("User allready logued")
}
else {
// Show the signup or login screen
self.performSegueWithIdentifier("goToLogIn", sender: self)
}
}
override func viewWillAppear(animated: Bool) {
self.tableView.separatorColor = UIColor.whiteColor()
tabBarController?.tabBar.tintColor = UIColor.whiteColor()
self.loadUser()
self.loadPost()
self.tableView.reloadData()
}
}
I also founded this solution :
//query for the friends of the user
var friendsRelation: AnyObject! = PFUser.currentUser().objectForKey("KfriendsRelation")
var findFriends : PFQuery = friendsRelation.query()
//using the friends from the query above, we find all the posts of the friends of the current user
var findPosts:PFQuery = PFQuery(className: "UserPost")
findPosts.whereKey("from", matchesQuery:findFriends)
findPost.orderByDescending("createdAt")
//run the query
findPosts.findObjectsInBackgroundWithBlock { (objects:[AnyObject]!, error:NSError!) -> Void in
if !(error != nil) {
//found posts
self.tableView.reloadData()
} else {
// Log details of the failure
println("error loadind posts ")
}
}