I have Parse.enableLocalDatastore() in my app delegate before Parse.setApplicationId
Then I have var newPosts = PFObject(className: "Post") as a global variable.
Then I want to get 1,000 latest objects from the "Post" table from localDataStore that I enabled earlier so I do this:
var getNewPosts = PFQuery(className: "Post")
getNewPosts.fromLocalDatastore()
getNewPosts.limit = 1000
getNewPosts.orderByDescending("createdAt")
getNewPosts.findObjectsInBackgroundWithBlock {
(downloadedPosts, error) -> Void in
if downloadedPosts != nil && error == nil {
println(downloadedPosts) // I am getting table with no data
}
}
But I only get empty data rows.
If I comment out the getNewPosts.fromLocalDatastore() line results are fine.
I understand that I am missing the critical Pinning step but not sure from Parse documentation hoe and where to implement it. Can you please help?
You are getting no data....
reasons my be...
Wrong name of class (class names are case sensitive)
Data is not there in local storage
Try synchronous version of findObject: method and pin: method.
Related
I am trying to build a flutter plugin for the Sendbird iOS SDK. For some reason whenever I try to fetch data, I get null from a NSDictionary<NSString *,NSObject *> when I know for a fact that it is not (I have created the keys and values separately).
Most likely it's the fact that being a beginner with Swift I am doing something wrong. This is my code:
let channelMetadata = NSMutableDictionary()
// metadata is the NSDictionary<NSString *,NSObject *>
channel.getAllMetaData{ (metaData, error) in
guard let metadata = metaData, error == nil else {
// Error.
return
}
channelMetadata["status"] = metadata["status"]
channelMetadata["type"] = metadata["type"]
}
js["status"] = channelMetadata["status"]
it's:
js["status"]
Which returns null. I assume this is because I am doing something wrong with the way I am populating my empty dictionary, but I don't know what, even after searching for hours. Any help would be really appreciated.
I'm trying to save back to CloudKit after updating a reference list and getting the error on the first line of this code block.
Error: Ambiguous reference to member 'save(_:completionHandler:)'
CKContainer.default().publicCloudDatabase.save(establishment) { [unowned self] record, error in
DispatchQueue.main.async {
if let error = error {
print("error handling to come")
} else {
print("success")
}
}
}
This sits within a function where the user going to follow a given location (Establishment). We're taking the existing establishment, and its record of followers, checking to see if the selected user is in it, and appending them to the list if not (or creating it if the list of followers is null).
Edit, in case helpful
//Both of these are passed in from the prior view controller
var establishment: Establishment?
var loggedInUserID: String?
#objc func addTapped() {
// in here, we want to take the logged in user's ID and append it to the list of people that want to follow this establishment
// which is a CK Record Reference
let userID = CKRecord.ID(recordName: loggedInUserID!)
var establishmentTemp: Establishment? = establishment
var followers: [CKRecord.Reference]? = establishmentTemp?.followers
let reference = CKRecord.Reference(recordID: userID, action: CKRecord_Reference_Action.none)
if followers != nil {
if !followers!.contains(reference) {
establishmentTemp?.followers?.append(reference)
}
} else {
followers = [reference]
establishmentTemp?.followers = followers
establishment = establishmentTemp
}
[this is where the CKContainer.default.....save block pasted at the top of the question comes in]
I've looked through the various posts on 'ambiguous reference' but haven't been able to figure out the source of my issue. tried to explicitly set the types for establisthmentTemp and followers in case that was the issue (based on the solutions to other related posts) but no luck.
Afraid I'm out of ideas as a relatively inexperienced newbie!
Help appreciated.
Documenting the solution that I figured out:
Combination of two issues:
I was trying to save an updated version of a CK Record instead of updating
I was not passing a CK Record to the save() call - but a custom object
(I believe point two was the cause of the 'ambiguous reference to member'
error)
I solved it by replacing the save attempt (first block of code in the question) with:
//first get the record ID for the current establishment that is to be updated
let establishmentRecordID = establishment?.id
//then fetch the item from CK
CKContainer.default().publicCloudDatabase.fetch(withRecordID: establishmentRecordID!) { updatedRecord, error in
if let error = error {
print("error handling to come")
} else {
//then update the 'people' array with the revised one
updatedRecord!.setObject(followers as __CKRecordObjCValue?, forKey: "people")
//then save it
CKContainer.default().publicCloudDatabase.save(updatedRecord!) { savedRecord, error in
}
}
}
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.
}
}
})
I'm trying to insert a text under description column, and it keep giving me error, I think I'm having this issue because I wasn't able to use the pointer properly.. is there any one can help, I watched a number of tutorial video's as to how to setup the pointer in Parse, and that didn't solve the issue.
Thanks.
let me = self.textField.text
let query = PFQuery(className: "Store")
query.getObjectInBackgroundWithId ("product", block: {
(object: PFObject?, error: NSError?) -> Void in
if error != nil
{
print(error)
}
else if let transaction = object {
transaction["discription"] = "\(me)"
transaction.saveInBackground()
print(object!.objectForKey("discription"))
}
})
I finally got the answer, the best possible answer I got was, not store any information to the DB till all the input is done from the last page. It means you carry over the input as temp to each pages, then save it at the end... :)
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.