I am using the following code at my application:didFinishLaunchingWithOptions: function,
[PFUser enableAutomaticUser];
[[PFUser currentUser] saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
if (succeeded && !error) {
[[UserContainer sharedUserContainer] addUser:[PFUser currentUser]];
}
}];
hoping that if the user was removed from the database, this would create a new user, or resurrect the previous user. This completes with no error and with succeeded = true, but there is no data at the cloud.
Is this expected or a bug? How should I handle recreating new anonymous users when the existing user is deleted?
Related
I'm using Parse SDK, login and signup are working perfectly : [PFUser currentUser] is returning the current user.
But after restarting app, [PFUser currentUser] is returning nil.
Why is the application not persisting the session ?
Login code (from parse.com) I'm using :
[PFUser logInWithUsernameInBackground:self.username.text password:self.password.text
block:^(PFUser *user, NSError *error) {
if (user) {
// Do stuff after successful login.
} else {
// The login failed. Check error to see why.
}
}];
EDIT 2: Create new project, it works. I don't know how and why, but it works.
EDIT: There is no logoutin the whole project
It looks like you are calling .logout somewhere, in which case the app will return nil for [PFUser currentUser].
The current user will persist from session to session if you do not automatically log out the user.
PFUser *currentUser = [PFUser currentUser];
if (currentUser) {
//save the installation
PFInstallation *currentInstallation = [PFInstallation currentInstallation];
currentInstallation[#"installationUser"] = [[PFUser currentUser]objectId];
// here we add a column to the installation table and store the current user’s ID
// this way we can target specific users later
// while we’re at it, this is a good place to reset our app’s badge count
// you have to do this locally as well as on the parse server by updating
// the PFInstallation object
}
I updated the ParseSDK to 1.7.5 and also ParseFacebookUtilsV4 (1.7.5)
Then some our users can not save PFObject like this.
PFObject* post = [PFObject objectWithClassName:#"PostData"];
PFUser* user = [PFUser currentUser];
[post setObject:user forKey: #"user"];
...
[post saveInBackgroundWithBlock: ^(BOOL success, NSError *error){
if ( !success || error != nil ){
....
}
}];
It returns with error "user objects cannot allow writes from other users".
The user is using Facebook login and siged up in previous version's Parse SDK
(before Facebook SDK 4.0).
Even if the user deleted the app and re-installed, it's same error.
And it never happens the user signed up after ParseSDK 1.7.5.
To login with Facebook, I'm doing like this
[PFFacebookUtils logInInBackgroundWithReadPermissions: #[ #"public_profile", #"user_friends", #"email" ] block:^(PFUser *user, NSError *error){
}];
When I commented out adding user to PFObject, it succeeded.
Please give me some advice.
Thanks.
NOTE: For the quick fix, I stopped adding user on client, and use CloudCode
Parse.Cloud.beforeSave( "PostData", function(request, response) {
Parse.Cloud.useMasterKey();
var user = request.user;
var obj = request.object;
obj.set("user", user);
response.success();
});
it works...
When I'm changing for example a bool in the Parse backend I can not retrieve this value in my iOS app. Please see the following screenshot where the first bool of the user object was changed manually and the second was changed from the app.
The first one does not work whereas the one (that was changed from the app) does work.
I'm getting the value with the following piece of code:
[[PFUser currentUser] objectForKey:#"is_pro"]
In the first case the return object is always nil (where I've changed the bool manually).
After you've made changes to your user's Parse table, call
[[PFUser currentUser] fetch]; //synchronous
or
[[PFUser currentUser] fetchInBackground]; //asynchronous
or
[[PFUser currentUser] fetchInBackgroundWithBlock:^(PFObject *object, NSError *error) { //asynchronous with completion block
before
[[PFUser currentUser] objectForKey:#"is_pro"]
to get an updated copy of your [PFUser currentUser] object.
Note: refresh and refreshInBackgroundWithBlock: are now deprecated and have been replaced with fetch and fetchInBackgroundWithBlock:
Update:
As Ryan Kreager pointed out in the comments, it's probably better/more efficient to use fetchIfNeeded, fetchIfNeededInBackground, or fetchIfNeededInBackgroundWithBlock: "since they will use the local cache when available."
Examples in Swift:
First and foremost, please have a look at isDataAvailable and isDirty.
var user = PFUser.currentUser()!
// Gets whether the PFObject has been fetched.
// isDataAvailable: true if the PFObject is new or has been fetched or refreshed, otherwise false.
user.isDataAvailable()
// Gets whether any key-value pair in this object (or its children) has been added/updated/removed and not saved yet.
// Returns whether this object has been altered and not saved yet.
user.isDirty()
Also it is probably better/more efficient to use fetchIfNeeded, fetchIfNeededInBackground, or fetchIfNeededInBackgroundWithBlock: "since they will use the local cache when available."
// Synchronously fetches the PFObject data from the server if isDataAvailable is false.
user.fetchIfNeeded()
// Fetches the PFObject data asynchronously if isDataAvailable is false, then sets it as a result for the task.
user.fetchIfNeededInBackground()
// Fetches the PFObject data asynchronously if isDataAvailable is false, then calls the callback block.
user.fetchIfNeededInBackgroundWithBlock({
(object: PFObject?, error: NSError?) -> Void in
// Code here
})
Otherwise you can also use fetch, fetchInBackground, fetchInBackgroundWithBlock if you do not need to use the local cache.
// Synchronously fetches the PFObject with the current data from the server.
user.fetch()
// Fetches the PFObject asynchronously and sets it as a result for the task.
user.fetchInBackground()
// Fetches the PFObject asynchronously and executes the given callback block.
user.fetchInBackgroundWithBlock({
(object: PFObject?, error: NSError?) -> Void in
// Code here
})
When you have pointers you can not use fetch. this is the best way:
PFQuery *userQuery = [PFUser query];
[userQuery includeKey:#"addresses"];
[userQuery includeKey:#"cards"];
[userQuery whereKey:#"objectId" equalTo:[PFUser currentUser].objectId];
[userQuery getFirstObjectInBackgroundWithBlock:^(PFObject * _Nullable object, NSError * _Nullable error) {
}];
I'm trying to delete the image connected to the current user from the imageOne column in Parse.com. From the user class.
PFQuery *query = [PFUser query];
[query selectKeys:#[#"imageOne"]];
[query getObjectInBackgroundWithId:[[PFUser currentUser] objectId] block:^(PFObject *object, NSError *error) {
if (!error) {
[object deleteInBackground];
}
}];
My code doesn't work and the console logs this error "User cannot be deleted unless they have been authenticated via logIn or signUp".
How can I fix this?
Seems like the problem comes from the fact that object (image) comes from the user class, am I right?
Why are you doing a query for all users and then doing the delete for just the current user, that's the worst possible way to structure the query (and most likely to fail).
If the current user isn't in the first 100 returned your above code would never find a match.
This sort of query should instead be done using getObjectInBackgroundWithId:block:, but in the case of the current user you already have the object, just do this:
[[PFUser currentUser] deleteInBackground];
If instead you just want to delete information in a column, use the following:
PFUser *currentUser = [PFUser currentUser];
[currentUser removeObjectForKey:#"imageOne"];
[currentUser saveInBackground];
I would like write a PFUser object by the currentUser, i've added the ACL based on the Parse developer guide, but i still get an error:
'User cannot be saved unless they have been authenticated via logIn or signUp'
_ My code:
PFQuery *query = [PFUser query];
[query whereKey:#"username" equalTo:self.bBo];
PFObject *friendData = [query getFirstObject];
PFUser *user = (PFUser *)friendData;
PFACL *userACL = [PFACL ACL];
user.ACL = userACL;
[userACL setWriteAccess:YES forUser:[PFUser currentUser]];
PFRelation *friendRelation = [user relationforKey:#"array"];
[friendRelation addObject:[PFUser currentUser]];
[user saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
if (error){
NSLog(#"Error %# %#", error, [error userInfo]);
}
}];
I think i did everything correct, so i can't figure out what can be the problem. So if you made earlier something like this or know where is the problem, i would really appreciate any suggestions.
For security reasons, Parse won't allow you to save any changes to a user that is not currently logged in.
If you want to be able to make and save changes to user, you need to use Cloud Code and the Master Key to get around this roadblock.
I have had multiple problems like this before, and every time I've been forced to use a workaround via Cloud Code.
Here's an example of a workaround I did for creating a friends relationship between two users:
[PFCloud callFunction:#"editUser" withParameters:#{#"userId": user.objectId}];
The above code statement is in xcode, and executes the function I have added to my Cloud Code file.
Then, here's what my Cloud Code file looks like:
Parse.Cloud.define('editUser', function(request, response) {
var userId = request.params.userId;
var User = Parse.Object.extend('_User'),
user = new User({ objectId: userId });
var currentUser = request.user;
var relation = user.relation("friendsRelation");
relation.add(currentUser);
Parse.Cloud.useMasterKey();
user.save().then(function(user) {
response.success(user);
}, function(error) {
response.error(error)
});
});
The above code uses the Master Key to save changes to both the currently logged in user, and to the user who's objectId was passed into this function.
Code details:
var relation
This is just a variable I'm creating to hold what the following fucntion returns:
user.relation("friendsRelation");
In the above function, "friendsRelation" is the name of my PFRelation key in Parse.
Now that we have a valid relation object contain in our variable called relation, we execute this function with an argument of our currentUser object.
After that, all that's left is saving everything. I don't program with javascript, but I was still able to come up with the above solution by looking at the Parse Cloud Code docs, and searching around on their support forums.
If you take my template from above, and make some small changes, then you should be able to easily accomplish what you need. You just have to jump through these extra hoops because the Parse SDK doesn't want a situation where someone can login and somehow make changes to another user's account, whether by their own fault or a developer's mistake.
EDIT:
Here is the code to add the relationship for the current user:
PFRelation *friendsRelation = [[PFUser currentUser]relationforKey:#"friendsRelation"];
PFUser *user = [self.parseUsers objectAtIndex:indexPath.row];
[friendsRelation addObject:user];
[currentUser saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
if (error) {
NSLog(#"%# %#", error, [error userInfo]);
}
}];
And then you can call the Cloud Code method right after:
[PFCloud callFunction:#"editUser" withParameters:#{
#"userId": user.objectId
}];