I have PFUser saved as a pointer in this class. I'd like to retrieve the user's first name and corresponding "point value"
My attempt below to append that data to it's cell value, but it is only returning the last retrieved object for that key value.
var innerQuery : PFQuery = PFUser.query()!
innerQuery.whereKeyExists("objectId")
let query = PFQuery(className: "myClass")
query.whereKey("userId", matchesQuery: innerQuery)
query.whereKey("points", greaterThan: 1000)
query.findObjectsInBackgroundWithBlock{ (objects: [AnyObject]?, error: NSError?) -> Void in
if error == nil {
if let objects = query.findObjects() as? [PFObject]{
for object in objects {
if let listPoints = object.objectForKey("points") as? Int {
var temp = String(listPoints)
cell.pointStatus.text = temp
}
}
}
}
else{
println(error?.description)
}
}
I retrieve the users first name and profile picture in a separate call. Everything is functional aside from the query for points.
if let pfuser = userProfile["first_name"] as? String{
if let pfimage = userProfile["profile_picture"] as? PFFile{
pfimage.getDataInBackgroundWithBlock({
(result, error) in
cell.userIcon.image = UIImage(data: result!)
cell.userName.text = username
})
}
}
It appears that you are only writing the value of listPoints to one cell in
var temp = String(listPoints)
cell.pointStatus.text = temp
If you want to have multiple point values to be displayed, the cell reference will need to be changed.
Related
I have a chat filled with users and of course a username array. I want to get the profile picture associated with the username in order for each user in the username array. Parse, however, can only sort by ascending/descending order that I am aware of.
Therefore, I need to figure out how to sort the data once received.
I am ultimately appending a url to be used as the pic.
func getPics(_ completionHandler: #escaping () -> Void) {
let query = PFQuery(className: "_User")
var dictionary: [String : Int] = [:]
var unit = 0
for username in usernameArray {
unit += 1
dictionary[username] = unit
}
query.findObjectsInBackground(block: { (objects: [PFObject]?, error: Error?) in
if let objects = objects {
for object in objects {
if error == nil {
for user in self.usernameArray {
let pfuser = object["username"] as! String
if pfuser == user {
let imageFile = object["profilePic"] as? PFFileObject
let imageFileString = imageFile?.url as! String
if let url = URL(string: imageFileString) {
let replacedImageUrlString = imageFileString.replacingOccurrences(of: "[removed for privacy]", with: "removed for privacy")
let url = replacedImageUrlString as NSString
self.urlArray.append(url)
}
}
}
}
}
completionHandler()
}
})
}
I am not aware of Parse server, So I dont really know if there exists provision to get the response in specific order, if it exists that should be the optimal solution. But there is a generic issue with your solution, its the time complexity.
You have two nested for loops which makes its worst case complexity to be O(n^2), I guess the least you can do is to reduce its complexity to O(n)
func getPics(_ completionHandler: #escaping () -> Void) {
let query = PFQuery(className: "_User")
var dictionary: [String : Int] = [:]
var unit = 0
for username in usernameArray {
unit += 1
dictionary[username] = unit
}
query.findObjectsInBackground(block: { (objects: [PFObject]?, error: Error?) in
if let objects = objects, error == nil {
let objectsDict = Dictionary(grouping: objects, by: { $0["username"] as! String /* typically you should be accessing $0.username, but again am not aware of PFObject */})
for user in self.usernameArray {
if let pfuser = objectsDict[user]?[safe: 0] as? PFObject {
let imageFile = pfuser["profilePic"] as? PFFileObject
let imageFileString = imageFile?.url as! String
if let url = URL(string: imageFileString) {
let replacedImageUrlString = imageFileString.replacingOccurrences(of: "[removed for privacy]", with: "removed for privacy")
let url = replacedImageUrlString as NSString
self.urlArray.append(url)
}
}
}
completionHandler()
}
})
}
Once you get the array of PFObject, you can create a dictionary with username as the key and PFObject as value, once you have the dictionary you can get the PFObject for specific username in O(1), so you can run a single for loop which reduces your code's complexity to O(n)
P.S If you are wondering what [safe: 0] is you can add this handy extension to safely access object at specific index in an array
link: Safe (bounds-checked) array lookup in Swift, through optional bindings?
extension Collection {
subscript (safe index: Index) -> Element? {
return indices.contains(index) ? self[index] : nil
}
}
P.P.S: My answer is completely ignoring the complexity of Dictionary(grouping: API itself, I tried to look for the info, but couldnt find. But I think its O(n) not really sure though, whatever it is if its not O(n^2) you will still be benefited
I'm trying to write a Swift query that will get the object in the Avatar table that matches the User's avatar Pointer column. The following query doesn't pull any results:
var userAvatar = self.user["avatar"]
let avatarQuery = PFQuery(className: "Avatar")
avatarQuery.whereKey("objectId", equalTo: userAvatar)
avatarQuery.limit = 1
avatarQuery.findObjectsInBackgroundWithBlock{
(results: [PFObject]?, error: NSError?) -> Void in
if error != nil {
print(error)
} else if let results = results as? [PFObject]! {
for result in results {
I think the problem is that the whereKey clauses is looking for a String, yet userAvatar is a PFObject. I tried converting the PFObject to String but that's not possible.
Am I overthinking this? How can I just get the Avatar object that matches the PFObject stored in User -> avatar(Pointer)?
Thanks!
EDIT: Thanks to Daniel, this is the working code (I think adding the includeKey might have helped too):
let userAvatar = self.user["avatar"] as! PFObject
let avatarQuery = PFQuery(className: "Avatar")
avatarQuery.whereKey("objectId", equalTo: userAvatar.objectId!)
avatarQuery.includeKey("avatar")
avatarQuery.limit = 1
avatarQuery.findObjectsInBackgroundWithBlock{
(results: [PFObject]?, error: NSError?) -> Void in
if error != nil {
print(error)
} else if let results = results as? [PFObject]! {
for result in results {
So I think your problem is that you should not be comparing a string to a PfObject the object is not a string but a price of the object may be a string so you should compare something like the object.id to a string. If that makes sense.
I'm getting objects from Parse and display it in my UI. Now I am working on saving the data in Local DataStorage of Parse. I looked at the following Parse example:
let query = PFQuery(className: "GameScore")
query.fromLocalDatastore()
query.getObjectInBackgroundWithId("xWMyZ4YE").continueWithBlock {
(task: BFTask!) -> AnyObject in
if let error = task.error {
// Something went wrong.
return task;
}
// task.result will be your game score
return task;
}
The above example if for fetching 1 object. I dont know how to do the same for multiple objects. I am fetching the objects through MY following code:
let query:PFQuery = PFQuery(className: "Events")
query.findObjectsInBackgroundWithBlock {
(object, error) -> Void in
if object != nil
{
if(object!.count != 0)
{
for messageObject in object! {
let eventName:String? = (messageObject as! PFObject)["EventName"] as? String
let createdBy:String? = (messageObject as! PFObject)["CreatedBy"] as? String
let eventDate:String? = (messageObject as! PFObject)["EventDate"] as? String
objModalClass.eveName = eventName!
objModalClass.crtedBy = createdBy!
objModalClass.eveVenue = eventVenue!
}
}
}
}
In my above code, how can I save all the fetched objects in objModalClass in Local DataStorage. Kindly explain in detail.
You should look object pinning. As long as you have enabled the local datastore, you can retrieve objects by a pin name, as well as releasing those objects from the local datastore with unpinning. From the docs:
"Asynchronously stores the object and every object it points to in the local datastore, recursively."
For single objects:
public func pinInBackgroundWithName(name: String, block:PFBooleanResultBlock?)
For many objects:
public class func pinAllInBackground(objects: [AnyObject]?, withName name: String, block: PFBooleanResultBlock?)
The complementary unpinWithName(name: String) is available for both scenarios. Pinning only works with PFObjects and its subclasses.
You can also query from a pin name like so
var query = PFQuery.queryWithClassname("PFObject_subclass")
query.fromPinWithName("Your_given_pin_name")
query.findObjectsInBackgroundWithBlock { (objects: [PFObject]?, error: NSError?) -> Void in
//objects from pin name returned.
}
On Parse I have users with Facebook profile and Email login profile. So I want to bury for users data in my twitter-like app.
In my "messages" class on Parse I have column "sender" that contains pointers to parse users.
I just want to retrive and show the name of users in class "messages" contained in the column "sender" wich contains pointers to PFUsers of which I need data for keys
"first_name"
"last_name"
"profile_picture"
How can I retrive their data like name and image in order to show them in a tableview?
these are the declarations of my arrays:
var sendersArray : [String] = []
var picturesArray : [NSData] = []
maybe I could use something like this tuple, but I can't understand how to grab data from pointers
for user in list {
let firstName = "fist_name"
let lastName = "last_name"
let oProfileImage = NSData() //"image_profile" as! NSData
otherUsers.append((oName: firstName, oLastName: lastName, oImageProfle: oProfileImage))
}
version - 1:
I started with printing the whole pf object
//******************************************************
func theSearch() {
let theSearchQuery = PFQuery(className: "Messages")
theSearchQuery.findObjectsInBackgroundWithBlock({
(objects : [AnyObject]?, error : NSError?) -> Void in
for object in objects! {
let theName = object.sender!
print(object)
print(theName)
sendersArray.append(theName)
let profilePicture = object["profile_pic"] as! PFFile
picturesArray.append(profilePicture)
}
self.tableView.reloadData()
})
}
//*******************************************************
version - 2:
then, found this solution, but still, doesn't
func theSearch() {
let theSearchQuery = PFQuery(className: "Messages" )
theSearchQuery.includeKey("sender")
theSearchQuery.findObjectsInBackgroundWithBlock({
(objects : [AnyObject]?, error : NSError?) -> Void in
for object in objects! {
let theName = object.sender!["first_name"] as? String
print(object)
print(theName)
sendersArray.append(theName)
let profilePicture = object["profile_pic"] as! PFFile
picturesArray.append(profilePicture)
}
self.tableView.reloadData()
})
}
errors:
seems to be a problem with sender, maybe I shouldn't use it
thanks in advance
let theName = object.objectForKey("sender")!.objectForKey("first_name") as! String
Complete Code:
func theSearch() {
let theSearchQuery = PFQuery(className: "Messages")
theSearchQuery.includeKey("sender")
theSearchQuery.findObjectsInBackgroundWithBlock({
(objects : [AnyObject]?, error : NSError?) -> Void in
for object in objects! {
let theName = object.objectForKey("sender")!.objectForKey("first_name") as! String
print(object)
print(theName)
self.sendersArray.append(theName)
let profilePicture = object["profile_picture"] as! PFFile
self.picturesArray.append(profilePicture)
}
self.tableView.reloadData()
})
}
Also, your picturesArray should be of type PFFile, like this:
var picturesArray = [PFFile]()
NOT NSData. change that at the top of your class.
-----EDIT------:
If you want to retrieve an image from a parse query, do this:
1) at the top of your class, declare the following arrays to store the results:
// your images will be stored in the file array
var fileArray = [PFFile]()
// your first and last names will be stored in String Arrays:
var firstNameArray = [String]()
var lastNameArray = [String]()
2) perform the query:
let query1 = PFQuery(className: "_User")
query1.orderByDescending("createdAt")
query1.findObjectsInBackgroundWithBlock({
(objects : [AnyObject]?, error : NSError?) -> Void in
if error == nil {
for x in objects! {
let firstName = x.objectForKey("first_name") as! String
let lastName = x.objectForKey("last_name") as! String
self.firstNameArray.append(firstName)
self.lastNameArray.append(lastName)
if x.objectForKey("profile_picture") as? PFFile == nil {
print("do nothing cause it's nil")
}
else {
let file:PFFile = x.objectForKey("profile_image") as! PFFile
self.fileArray.append(file)
}
}
self.tableView.reloadData()
}
})
Note I am using Swift 2 and Xcode 7. Syntax is slightly different in Xcode 6.4 and Swift 1.2.
I need to get some 'Kurse' (PFObjects) from the database and then I need to get the name of another PFObject which is a pointer of the 'kurs' but if I try to do this nothing happens. There is no error and the program does not break or something like that but the "test2" is not printed!
let user = PFUser.currentUser()
let query = PFQuery(className: "Kurs")
query.whereKey("stufe", equalTo: user!["stufe"])
query.findObjectsInBackgroundWithBlock { (objects: [PFObject]?, error: NSError?) -> Void in
if error != nil {
print(error)
}
else if let kurse = objects{
print("kurse:", kurse)
for kurs in kurse{
print("kurs:", kurs)
var gibtEsSchon = false
if gibtEsSchon == false{
print("test1")
let fach = kurs["fach"] as! PFObject
print("fach", fach)
let name = fach["name"] as! String
print("test2")
self.daten.append(Fach(dieKurse: [kurs], name: name))
print("daten 3", self.daten)
}
}
}
So the line
let name = fach["name"] as! String
is not called.
But I think I know why: If I print("fach", fach) the result doesn't have the attribute 'name' that it should have. I think that the PFObject is not loaded completely:
What I get:
fach {
}
What I want:
fach {
name = German;
}
Adding query.includeKey("fach") above query.findObjectsInBackgroundWithBlock should fix that.
From the PFQuery class reference, includeKey will
Make the query include PFObjects that have a reference stored at the provided key.