I'm doing a Facebook graph call to get friends of the user that are using my app. I get the facebook ID of the user's friends back from the graph call. Below is what I'm attempting to obtain from Parse with that ID, but's it's not getting all the users back, I believe since its an async call. How can I save an array of pointers of the user's fb friends that are using the app? Thanks in advance!!
graphConnection.addRequest(requestFriends, completionHandler: { (connection: FBSDKGraphRequestConnection!, result: AnyObject!, error: NSError!) -> Void in
if result.objectForKey("friends") != nil {
// parsing dictionary to get results
let firstDict = result.objectForKey("friends")
let dataArray = firstDict!.objectForKey("data")
let myFriendsUsingTheAppCount = dataArray!.count
print("\(myFriendsUsingTheAppCount)")
let friendsArray:NSMutableArray = []
for var i = 0; i < dataArray!.count; i++ {
let friend = dataArray![i]
let friendFbObjectID = friend.objectForKey("id")!
let query = PFUser.query()
query!.whereKey("facebookID", equalTo: friendFbObjectID)
query!.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if error == nil {
// this is where I was going to save this specific user as a pointer
} else {
// some error
}
})
// this is saving just the friend's name/fb id to an array, but I want an array of pointers to the PFUser
friendsArray.addObject(friend)
}
} else {
// fb friends is nil
print("FB friends came back nil")
}
})
This could be simplified into a single query by using whereKey:containedIn:
let facebookIDs = dataArray.map { $0.objectForKey("id")! }
let query = PFUser.query()!
query.whereKey("facebookID", containedIn: facebookIDs)
The query will now contain all users whose facebook id is in the array passed to the query.
(swift syntax may be incorrect did not double check)
Related
I am making a chat Application in ios through parse server. I have made a MessageRoom collection which has many to many relationship with users through PFRelation. Now i am struck . Whenever a user starts a new conversation , I add new entry in MessageRoom collection and use its id in the messages of that group. But when i want to fetch a previous conversation , let say a conversation between 5 users , how will i query the messageRoom which has exactly the same 5 users (not more or less) in its relation ?
This is the code i am using to create or get Message Room . It is not working correctly. What it does is instead of making a new messageRoom first time and fetching the same for latter user , it makes a new messaga room every time.
class func createOrGetMessageRoom(users:[PFUser], description:String)->PFObject{
var returnMessageRoom:PFObject = PFObject(className: PF_MESSAGE_ROOM_CLASS_NAME);
let users = users.sort(increasingIDs)
let query:PFQuery = PFQuery(className: PF_MESSAGE_ROOM_CLASS_NAME)
query.whereKey(PF_MESSAGE_ROOM_USERS, containsAllObjectsInArray : users)
query.findObjectsInBackgroundWithBlock{(objects, error )->Void in
if error == nil {
if objects?.count == 0 {
let messageRoom = PFObject(className: PF_MESSAGE_ROOM_CLASS_NAME)
messageRoom[PF_MESSAGE_ROOM_DESCRIPTION] = description
messageRoom[PF_MESSAGE_ROOM_LAST_USER] = PFUser.currentUser()
messageRoom[PF_MESSAGE_ROOM_LAST_MESSAGE] = ""
messageRoom[PF_MESSAGE_ROOM_COUNTER] = 0
messageRoom[PF_MESSAGE_ROOM_UPDATE_TIME] = NSDate()
let messageUsers = messageRoom.relationForKey(PF_MESSAGE_ROOM_USERS)
for user in users {
messageUsers.addObject(user)
}
messageRoom.saveInBackgroundWithBlock{(success,error)->Void in
if error == nil {
returnMessageRoom = messageRoom
}
}
}else{
returnMessageRoom = objects![0]
}
}else{
print("Message.createMessage Erorr");
print(error)
}
}
return returnMessageRoom
}
class func increasingIDs(user1: PFUser, user2: PFUser) -> Bool {
return user1.objectId < user2.objectId
}
I have also checked this application . What it does is whenever it starts a new chat , it concatenates objectIds of users in ascending order and use it as a groupId which is used for future references and used in chat messages as a foreign key.
It'll work in private chat and in group chat , but what happens if a user has started a group chat , and wants to add new users to this chat ?? If we simple change the group id by concatenating this users id , the previous messages which have used the old group id will no longer appear in this message group.
Also tell me if this approach of making groupID through concatenation is better or many to many relationship is better?
One problem with your function createOrGetMessageRoom is that findObjectsInBackgroundWithBlock is asynchronous, and you're not taking that into account.
What this means is that the findObjectsInBackgroundWithBlock function gets a response a long time after createOrGetMessageRoom has returned.
So, the PFObject you create on the first line of your function is always returned - your function does not wait for findObjectsInBackgroundWithBlock to return a MessageRoom.
To fix this, make your code take a callback like this:
class func createOrGetMessageRoom(users:[PFUser], description:String, callback: (PFObject? -> Void)) {
let users = users.sort(increasingIDs)
let query:PFQuery = PFQuery(className: PF_MESSAGE_ROOM_CLASS_NAME)
query.whereKey(PF_MESSAGE_ROOM_USERS, containsAllObjectsInArray : users)
query.findObjectsInBackgroundWithBlock{(objects, error )->Void in
if error == nil {
if objects?.count == 0 {
let messageRoom = PFObject(className: PF_MESSAGE_ROOM_CLASS_NAME)
messageRoom[PF_MESSAGE_ROOM_DESCRIPTION] = description
messageRoom[PF_MESSAGE_ROOM_LAST_USER] = PFUser.currentUser()
messageRoom[PF_MESSAGE_ROOM_LAST_MESSAGE] = ""
messageRoom[PF_MESSAGE_ROOM_COUNTER] = 0
messageRoom[PF_MESSAGE_ROOM_UPDATE_TIME] = NSDate()
let messageUsers = messageRoom.relationForKey(PF_MESSAGE_ROOM_USERS)
for user in users {
messageUsers.addObject(user)
}
messageRoom.saveInBackgroundWithBlock{(success,error)->Void in
if error == nil {
callback(messageRoom)
}
callback(nil)
}
}else{
callback(objects![0])
}
}else{
print("Message.createMessage Erorr");
print(error)
callback(nil)
}
}
}
Usage:
YourClass.createOrGetMessageRoom([], description: "description") { messageRoom in
// Do something...
}
The db schema in my mind, you should have 3 collections, _User, MessageRoom, and Message.
MessageRoom: users, roomName and other infos.
Message: room(pointer of MessageRoom), msg(content), sender(pointer of _User)
below are pseudo code
In your app, query all current user involved messageRooms.
var query = new Parse.Query("MessageRoom")
query.equalTo("users", currentUser);
//other constraint, roomName, createdAt, limit ...
query.find(...)
Pick a messageRoom object, and then use it to getMessages.
var query2 = new Parse.Query("Message");
query2.eqaulTo("room", roomObj);
query2.include("sender");
query2.descending("createdAt");
query2.find(...)
Hi guys I'm trying to build a simple swipe app to like and dislike uploaded photos. I'm struggling with adding the likes/dislikes to Parse the way that I want them to. I've tried two ways so far:
adding the objectId of the posted image to the User who liked/disliked it but the problem is only one of the objectId's shows up in the array.
staying in the Parse class where the images are posted to (Post), add the userID of the liker/disliker to the image. This doesn't happen at all, new rows are created with new objectId's everytime an image is liked/disliked.
Ideally I want the users who have liked/disliked the photo in a single array so I can query this later. I don't have a great understanding of Parse, it's my first time using it so any help will be massively appreciated.
Here is the code I'm using when an image is swiped (adding to Post class):
if gesture.state == UIGestureRecognizerState.Ended {
var likedOrDisliked = ""
if label.center.x < 100 {
print("Dislike")
likedOrDisliked = "disliked"
} else if label.center.x > self.view.bounds.width - 100 {
print("Like")
likedOrDisliked = "liked"
}
if likedOrDisliked != ""{
var post = PFObject(className: "Post")
post.addUniqueObjectsFromArray([(PFUser.currentUser()?.objectId!)!], forKey: likedOrDisliked)
post.saveInBackground()
}
This is the snippet of when I try adding to User class:
PFUser.currentUser()?.addUniqueObjectsFromArray([displayedUserID], forKey: likedOrDisliked)
do {
try PFUser.currentUser()?.save()
} catch {
}
Here is what happens in the dashboard,
new rows created
What you wanted is to update the actual Post with the like/dislike user
Create a Post (This part you have not explained but i am show a simple assumption - pseuodo code)
var post = PFObject(class:"Post")
post["image"] = PFFile(image)
post.save()
Next you show the image on screen by getting the image from the post
When the user dislikes/likes
you add the current PFUser to the liked/disliked column and save back the object.
let arrayMut = NSMutableArray()
var array = NSArray()
if let arrayData = post.objectForKey("likedUser") as? NSArray {
array = arrayData
}
loop through now the array to find if current user is there.. if not find .. add current PFUser
arrayMut.addObject(PFUser.currentUser().objectId);
post.setObject(arrayMut, forKey: "likedUser")
post.save()
I've tried a lot of things and eventually something stuck, the desired effect was achieved through (added the current user to the liked or disliked fields) :
if likedOrDisliked != ""{
var post = PFQuery(className: "Post")
post.findObjectsInBackgroundWithBlock({ (objects: [PFObject]?, error: NSError?) -> Void in
if error == nil {
if let objects = objects {
for object in objects {
var objId = object["objectId"]
var query = PFQuery(className: "Post")
query.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if error == nil {
object.addUniqueObjectsFromArray([(PFUser.currentUser()?.objectId)!], forKey: likedOrDisliked)
object.saveInBackground()
}
})
}
}
}
})
I am trying to check if user entered data matches object data in a class. Comparing works, but refreshing does not.
This is the code.
let query = PFQuery(className: "registeredCodes")
query.whereKey("code", equalTo: userCodeEnter.text!)
query.getFirstObjectInBackgroundWithBlock {
(object: PFObject?, error: NSError?) -> Void in
if error != nil || object == nil {
print("The getFirstObject request failed.")
} else {
// The find succeeded.
print("Successfully retrieved the object.")
let totalPoints = PFUser.currentUser()?["points"] as? Int
self.userPointsLabel.text = "Punkte: " + "\(totalPoints)"
}
}
After
let totalPoints = PFUser.currentUser()?["points"] as? Int
self.userPointsLabel.text = "Punkte: " + "\(totalPoints)"
It just puts an "optional" in front of the original number, but not the new one. It looks something like optional(5)
Your code is querying (pulling an object from the server, with some check) for the registeredCodes class. Then, when that's done, your code is using the PFUser.currentUser to do something. This is a different class. The query will not result in an update to the PFUser.currentUser.
If PFUser.currentUser is expected to have changed then you need to call refreshInBackgroundWithBlock: on it to get those updates so you can use them (they will be ready when the completion block is called.
How can I update all rows with the same key value in a Parse class?
As my code, I think Parse would cost a lot of my money if there are 100 objects per user.
Is there any other way to do that?
let username = PFUser.currentUser()?.username
let objectQuery = PFQuery(className: "FriendList")
objectQuery.whereKey("username", equalTo: username!)
objectQuery.findObjectsInBackgroundWithBlock { (friendList:[AnyObject]?, error:NSError?) -> Void in
if let friendList = friendList as? [PFObject] {
for myInfo in friendList {
myInfo["contact"] = contact
myInfo["portrait"] = PFFile(data: portraitNSData)
myInfo["company"] = company
myInfo["position"] = position
myInfo.save() // create a request?
}
}
}
Form array of needed objects and than just
PFObject.saveAllInBackground(objectsArray)
Parse has a functions to object see to save many objects (see documentation here)
PFObject.saveAllInBackground(array, block: {
(succeeded: Bool, error: NSError!) -> Void in
if (error != nil) {
println("Error saving: \(error)")
}
})
Unfortunately the documentation is not update to Swift but you can see a list of the function in objective-c
saveAll:
saveAll:error:
saveAllInBackground:
saveAllInBackground:block:
It would be best to create a CloudCode function. Then call that function from iOS. It's not difficult, see their documentation here: Parse.com
I'm using the TwitterKit SDK and listing a group of Tweets. The function has an error handler that stores any tweets that have been removed by the user and thus not shown. I am attempting to retrieve these particular ID's from the NSError user info dictionary. I can find them but end up with an anyObject.
This code is getting the tweet objects and filtering out the bad ones...
// load tweets with guest login
Twitter.sharedInstance().logInGuestWithCompletion {
(session: TWTRGuestSession!, error: NSError!) in
// Find the tweets with the tweetIDs
Twitter.sharedInstance().APIClient.loadTweetsWithIDs(tweetIDs) {
(twttrs, error) - > Void in
// If there are tweets do something magical
if ((twttrs) != nil) {
// Loop through tweets and do something
for i in twttrs {
// Append the Tweet to the Tweets to display in the table view.
self.tweetsArray.append(i as TWTRTweet)
}
} else {
println(error)
}
println(error)
if let fails: AnyObject = error.userInfo?["TweetsNotLoaded"] {
println(fails)
}
}
}
The println(error) dump is...
Error Domain=TWTRErrorDomain Code=4 "Failed to fetch one or more of the following tweet IDs: 480705559465713666, 489783592151965697." UserInfo=0x8051ab80 {TweetsNotLoaded=(
480705559465713666,
489783592151965697
), NSLocalizedDescription=Failed to fetch one or more of the following tweet IDs: 480705559465713666, 489783592151965697.}
and refining the results from the error "error.userInfo?["TweetsNotLoaded"]" I can end up with...
(
480705559465713666,
489783592151965697
)
My question is, is there a better way to get this data?
If not, how am I able to convert the (data, data) anyObject into an array of [data, data] ?
Best guess is that TweetsNotLoaded is an NSArray of NSNumber (or maybe NSString, not sure how they're coding/storing message ids), so you can cast the result and go from there:
if let tweetsNotLoaded = error.userInfo?["TweetsNotLoaded"] as? [String] {
// here tweets not loaded will be [String], deal with them however
...
}
If that doesn't work, assume they're longs and use:
if let tweetsNotLoaded = error.userInfo?["TweetsNotLoaded"] as? [Int64] {
// here tweets not loaded will be [Int64], deal with them however
...
}