I have a second class in parse where each row is linked to the user and stores an int number. This is already setup.
Now I want to check for the current user and get the int that is saved and put that in a label. Any Ideas?
you will need to query with constraints ("meaning that get data only for the currentUser"). Then you have two options to retrieve their data either use getfirstobjectinbackgroundwithblock() method which will get at least one row of data from parse. Or use findObjectsInBackgroundWithBlock() method which will return multiple rows from parse.
if in parse, the user is being saved as pointer use that line:
let userT = PFUser.CurrentUser() //<-- to get CurrentUser
if in parse, the user is being saved as string use that line
let userT = PFUser.CurrentUser().username //<-- to get CurrentUser
In this code, I use the getFirstObjectInBackgroundWithBlock method because I think you are only displaying one thing for the user, So if I am wrong use the second method findObjectsInBackgroundWithBlock
let query = PFQuery(className:"whateverNameYourClassIs")
let userT = PFUser.CurrentUser() //<-- to get CurrentUser
query.whereKey("NameOfUserColummInParse" equalTo:userT!)
query.getFirstObjectInBackgroundWithBlock { (object: PFObject?, error: NSError?) -> Void in
if error == nil
{
if let retreiveObject = object
{
let data = retreiveObject["IntValue"] as! Int //<-- IntValue supposed to be the name of your class column in parse where you want to retrieve the value.
}
}
})
Related
As I try to update an existing entry in my Core Data DB, I fetch the desired item by id, change it to a new item and save in context.
However, when I fetch the object and replace it, I get the warning "Core Data Object was written to, but never read." It does make sense since I'm not really using that object, but as I understand it, just giving it a value saves it in Core Data.
static var current: User? {
didSet {
if var userInCoreData = User.get(with: current?.id), let current = current { //userInCoreData is the value with the warning
userInCoreData = current
}
CoreDataManager.saveInContext()
}
}
static func get(with id: String?) -> User? {
guard let id = id else { return nil }
let request: NSFetchRequest = User.fetchRequest()
let predicate = NSPredicate(format: "id = %#", id)
request.predicate = predicate
do {
let users = try CoreDataManager.managedContext.fetch(request)
return users.first
} catch let error {
print(error.localizedDescription)
return nil
}
}
I want to make sure, is this the recommended process to overwrite a value in Core Data, or am I doing something wrong?
This section
if var userInCoreData = User.get(with: current?.id), let current = current { //userInCoreData is the value with the warning
userInCoreData = current
}
seems just updating local variable userInCoreData, not User object in Core Data.
So the warning says "you fetched data from core data and set to a variable, but you set another value to the variable soon, never use the first value from core data. Is it OK?"
What you really want to do is something like this?
if var userInCoreData = User.get(with: current?.id), let current = current {
userInCoreData.someValue = current.someValue
userInCoreData.anotherValue = current.anotherValue
}
I have a PFObject, Account that contains an array of Users which are subclasses of PFUserss. The User then has a NSDictonary property, allowableApps, that's a NSDictionary of arrays, where they arrays contain PFObjects.
So as a structure:
Account
var users: [User]
which points to....
User
// Each key is an array of AllowApp
var allowableApps: NSMutableDictionary
which points to...
AllowableApp
var appName: String
var appURL: String
var isAllowed: Bool
I'm trying to fetch all of these relations down to AllowableApp in a single query. I've tried using the .includeKey like this:
accountQuery?.includeKey("users")
accountQuery?.includeKey("allowableApps")
which didn't work. I've also tried:
accountQuery?.includeKey("users.allowableApps.appName")
accountQuery?.includeKey("users.allowableApps.appURL")
accountQuery?.includeKey("users.allowableApps.isAllowed")
I try to populate a UITableView with all the AllowableApp objects but I get this error:
Key "appName" has no data. Call fetchIfNeeded before getting its value.
Which I understand, I need to fetch all of them before trying to access the appName property. (which I'm trying to set cellForRowAtIndexPath).
Here is my full query:
let currentUser = User.currentUser()
let accountQuery = Account.query()
accountQuery?.whereKey("primaryUser", equalTo: currentUser!)
accountQuery?.includeKey("users.allowableApps")
accountQuery?.getFirstObjectInBackgroundWithBlock({ (account, error) in
if (error != nil) {
completion(users: nil, error: error)
}
else {
let users = (account as? Account)!.users
completion(users: users, error: nil)
}
})
My thought right now is to just loop through all of the AllowableApp objects in viewDidAppear calling fetchInBackgroundWithBlock. Then once they are all loaded I reload the table data.
This seems realllly messy and a common problem. Is there a more elegant solution that I'm just not seeing?
From what i understand you have the following structure:
Account
Users (Array of User)
AllowsableApps (Array of AllowApps)
First of all change the NSMutableDictionary to Array. NSMutableDictionary is a key-value pairs and in parse you should create one field. So you can use Array of AllowApps and it will do the same effect.
In order to fetch all accounts and users in each of the account and allowable apps per user you need to build the following query:
// You can do it with sub classing if you want
let query = PFQuery(className: "Account")
query.includeKey("users.allowableApps")
query.findObjectsInBackgroundWithBlock {
(objects: [PFObject]?, error: NSError?) -> Void in
}
Now for your users array. If your users array is users that needs to login the app it's better to inherit from PFUser and not from PFObject because PFUser contains all the logic for handling users in your app.
I am very new to swift and I don't know Obj C at all so many of the resources are hard to understand. Basically I'm trying to populate the dictionary with PFUsers from my query and then set PFUser["friends"] to this dictionary. Simply put I want a friends list in my PFUser class, where each friend is a PFUser and a string.
Thanks!
var user = PFUser()
var friendsPFUser:[PFUser] = []
var friendListDict: [PFUser:String] = Dictionary()
var query = PFUser.query()
query!.findObjectsInBackgroundWithBlock {
(users: [AnyObject]?, error: NSError?) -> Void in
if error == nil {
// The find succeeded.
println("Successfully retrieved \(users!.count) users.")
// Do something with the found objects
if let users = users as? [PFUser] {
friendsPFUser = users
for user in friendsPFUser{
friendListDict[user] = "confirmed"
}
user["friends"] = friendListDict //this line breaks things
user.saveInBackground()
}
} else {
// Log details of the failure
println("Error: \(error!) \(error!.userInfo!)")
}
}
To be clear, this code compiles but when I add
user["friends"] = friendListDict
my app crashes.
For those who might have this issues with. "NSInternalInconsistencyException" with reason "PFObject contains container item that isn't cached."
Adding Objects to a user (such as arrays or dictionaries) for security reasons on Parse, the user for such field that will be modified must be the current user.
Try signing up and using addObject inside the block and don't forget do save it!
It helped for a similar problem I had.
How should I access columns that I've added to the User table when I have a currentUser object?
I have a PFUser.currentUser() and I want to access the nickname column that I added via the web interface.
Can I use the currentUser to get the data e.g.:
var nickname = PFUser.currentUser()["nickname"] as String
Or do I have to use a user query? e.g.:
var query = PFUser.query()
query.whereKey("username", equalTo:PFUser.currentUser().username)
var user = query.findObjects().first as PFUser
var nickname = user["nickname"]
If you added date to the column locally, then you have to use the first way as you wrote, or if you added date in the browser, or uploaded to parse.com some way, you have to use the second way.
I would like to give my two cents too. First of all, Daniel was right in saying that if you added the date in the browser or uploaded it to parse.com, you need to use the second way. This is an updated answer with iOS 9 and Xcode 7.2:
var query = PFUser.query()
query!.whereKey("username", equalTo:PFUser.currentUser()!.username!)
do {
user = try query!.findObjects().first as! PFUser
} catch {
print("Error finding user")
}
if user?["rankNumber"] as? Int == nil {
user!["rankNumber"] = 0
user!.saveInBackground()
} else {
print(user!["rankNumber"] as! Int)
}
If I did it any other way, xcode would give me an error saying "failing to unwrap optional". I hope this can help someone!
I have custom value in a PFUser column called "website". I am trying to get this value using the code below but it does not seem to change on the device if I update the value from Parse.com on their website using the data viewer. It also does not update across devices.
Any Ideas?
websiteField.text = currentUser.objectForKey("website") as String
I have managed to get it working with the code below.
var currentUser = PFUser.currentUser()
currentUser.refreshInBackgroundWithBlock { (object, error) -> Void in
println("Refreshed")
currentUser.fetchIfNeededInBackgroundWithBlock { (result, error) -> Void in
self.websiteStr = currentUser.objectForKey("website") as String
self.websiteField.text = self.websiteStr
println("Updated")
println(self.websiteStr)
}
}