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.
Related
I am importing an array from parse, and I want to add that array to an array of arrays, but the app crashes when it tries to append the imported array. Why is that occurring and how can I fix it? Crash error is Thread 1: EXC_BAD_INSTRUCTION(code=EXC_I386_INVOP, subcode=0x0 I commented the append line and it does not crash, so it has to be that line.
var animalarray: [[String]] = []
let query = PFQuery(className: "animals")
query.findObjectsInBackgroundWithBlock { (objects: [PFObject]?, error: NSError?) -> Void in
if error == nil{
for object in objects!{
if let animalss = object["CoordinateTest"]{
print("coord \(animalss)")
self.animalarray.append(animalss as! [String])//crashes here
}
}
}
}
You should create a method that retrieves the data, and use queries to specify what you want. Also you should create a temporary variable to hold to retrieved data and append that variable to the array.
Ex.)
var animalsArray: [String] = []
func retrieveData(){
let query = PFQuery(className: "animals")
query.whereKey("Key", equalTo: object)
query.orderByDescending("createdAt")
query.findObjectsInBackgroundWithBlock {
(object:[PFObject]?, error:NSError?) -> Void in
if ( error != nil ){
print(error?.localizedDescription, error?.userInfo)
} else {
for temp: PFObject in object! {
let animals: String = temp["CoordinateTest"] as! String
self.animalsArray.append(animals!)
}
}
}
}
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.
}
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.
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.
I'm using Parse findObjectsInBackgroundWithBlock that returns [AnyObject]? how do I extract the column data?
You need to cast your results like so:
objects as? [PFObject], then each result will contain a PFObject dictionary with the column name as the key. for example o["id"] will return the value of the id column for a specific object
Just do
let data = objects as! [PFObject]
let firstObject = objects[0]
// firstObject["Column"]
Well it is easy like the code below,
In my case i get the score you can use your DB table column names
query.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]?, error: NSError?) -> Void in
if error == nil {
if let objects = objects as? [PFObject] {
for object in objects {
var score : Int? = object["score"] as! Int?
}
} else {
// Log details of the failure
println("Error: \(error!) \(error!.userInfo!)")
}
}