I am trying to increment by 1 a column called "ThumbsDown" in my Parse Database, but the line of code where I perform such increment makes the app to crash. The column is of type "Number".
PFQuery *downvoteUser = [PFQuery queryWithClassName:#"UserRating"];
[downvoteUser whereKey:#"User" equalTo:PFUser.currentUser.username];
NSArray *downVote = [downvoteUser findObjects];
NSLog(#"objectID : %#", [downVote valueForKey:#"objectId"]);
NSLog(#"ThumbsDown : %#", [downVote valueForKey:#"ThumbsDown"]);
// Here we update the Rated column in Event Class
PFObject *CurrentUserThumbsDown = [PFObject objectWithoutDataWithClassName:#"UserRating" objectId:[downVote valueForKey:#"objectId"]];
[CurrentUserThumbsDown incrementKey:#"ThumbsDown"];
[CurrentUserThumbsDown save];
According to my tests :
If I remove the incrementKey, it won't crash; but it won't do anything
The NSLogs actually return the expected values, fetched from the cloud.
I cant event print out the error from save, because it crashes before being able to catch it
The crash error that I get is this one:
2020-01-19 19:25:41.024887+0100 Sporteve[39724:418054] Warning: A long-running operation is being executed on the main thread.
Break on warnBlockingOperationOnMainThread() to debug.
2020-01-19 19:25:41.025422+0100 Sporteve[39724:418243] -[__NSSingleObjectArrayI length]: unrecognized selector sent to instance 0x600001572ef0
2020-01-19 19:25:41.027731+0100 Sporteve[39724:418243] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSSingleObjectArrayI length]: unrecognized selector sent to instance 0x600001572ef0'
EDIT/HINT:
If I change the objectID in the PFObject for a real objectId from the database, it actually works, so the problem must be in the NSArray.
Super simple.
#Vadian asked me the correct question. I am retrieving just 1 object, so the correct line would be this one :
PFObject *CurrentUserThumbsDown = [PFObject objectWithoutDataWithClassName:#"UserRating" objectId:[downVote[0] valueForKey:#"objectId"]];
EDIT:
A better idea provided in the comments below is to to just getFirstObject, and it is a better idea:
PFObject *CurrentUserThumbsDown = [downvoteUser getFirstObject];
Related
My iOS app terminates with Thread 1: signal SIGABRT error. The strange thing is, when I hover the cursor over the NSNumber object (where the error has occurred), it displays the objects of an NSDictionary with Key/Value pair. Following is my code snippet:
for(id obj in [MainDict allKeys])
{
NSArray *AnArrayInsideMainDict = [MainDict objectForKey:obj];
double i=1;
for(NSUInteger n=0; n<4; n++)
{
NSNumber *anObject = [AnArrayInsideMainDict objectAtIndex:n];
NSNumber *nextObject = [nextDict objectForKey:[NSNumber numberWithDouble:i]];
NSNumber *HereIsTheError = [NSNumber numberWithFloat:(powf(([anObject floatValue]-[nextObject floatValue]),2))];
[ThisIsMutableArray addObject:HereIsTheError];
i++
}
}
Here, the MainDict contains 64 key/value pairs (each key contains an NSArray of 5 objects).nextDictis an NSDictionary with 4 key/value pairs (each key contains one NSNumber object // EDIT: each key actually contained an NSArray with single NSNumber Object, this was the reason for the error). After the app termination and hovering the cursor over the HereIsTheError, I get following key/value pair:
The terminating error at the console is:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayM floatValue]: unrecognized selector sent to instance 0x170257a30'
*** First throw call stack:
(0x18b032fe0 0x189a94538 0x18b039ef4 0x18b036f54 0x18af32d4c 0x1000891a0 0x10008bd74 0x10020d598 0x100579a50 0x100579a10 0x10057eb78 0x18afe10c8 0x18afdece4 0x18af0eda4 0x18c979074 0x1911c9c9c 0x1000906b4 0x189f1d59c)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
How can NSNumber conation the objects of NSDictionary? I use Xcode Version 9.0.1 (9A1004) and Objective-C.
As the comments state, but most importantly your error message states, your objects anObject and nextObject are not NSNumber's - they are NSMutableArray's, hence the
-[__NSArrayM floatValue]: unrecognized selector...
part of your error.
Ensure the objects in AnArrayInsideMainDict are in fact
NSNumber's before attempting to cast them as numbers,
I would suggest flagging your objects before "assuming" their types, but I doubt that would help you get your desired outcome (as this would most likely from your case here skip each object that is not an NSNumber).
Before you even enter the for loop in [MainDict allKeys], backtrace to make sure you are in fact passing arrays of NSNumber's as the dictionaries objects.
IF you are actually not sure of the object types, you can just throw a flag to make sure you are not misinterpreting any of the objects:
...
for (NSUInteger n=0; n<4; n++) {
NSNumber *anObject = [AnArrayInsideMainDict objectAtIndex:n];
NSNumber *nextObject = [nextDict objectForKey:[NSNumber numberWithDouble:i]];
if ([anObject isKindOfClass:NSNumber.class] && [nextObject isKindOfClass:NSNumber.class]) {
// Good to continue now that you know the objects
} else NSLog(#"whoops.. anObject: %# nextObject: %#", anObject.class, nextObject.class);
...
LASTLY, if you are so daring, and are sure that somewhere in this dictionary are your NSNumber's, you could flag your steps to check for instances of the NSNumber.class in order to seek out your floats.
Otherwise, I suggest deep diving into the how and where you are getting your MainDict from.
Happy coding - cheers!
I'm trying to create a nested json using the sequent code. The problem is that when the system executes the line
jsonOnCloud = #{
#"server_item_id": i.ref_cloud_id,
#"client_item_id": extra.id_item,
#"extras": extras
};`
generates me the error
-[__NSDictionaryI length]: unrecognized selector sent to instance 0x110cefc0
2016-05-25 12:32:25.733 LiSchool[3145:745044] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSDictionaryI length]: unrecognized selector sent to instance 0x110cefc0'
this is the code
NSMutableArray *extras = [[NSMutableArray alloc] init];
NSDictionary *jsonOnCloud = [[NSDictionary alloc] init];
NSDictionary *extraJson = #{
#"action": action,
#"client_id": extra.id.stringValue,
#"id_repo": g.id_repository,
#"page": extra.page.stringValue,
#"creation_utc_client": extra.datetime_creation
};
[extras addObject:extraJson];
jsonOnCloud = #{
#"server_item_id": i.ref_cloud_id,
#"client_item_id": extra.id_item,
#"extras": extras
};
You have not provided enough information for us to be able to help you. the code you say is crashing:
jsonOnCloud = #{
#"server_item_id": i.ref_cloud_id,
#"client_item_id": extra.id_item,
#"extras": extras
};
Refers to objects that you don't describe.
What is i? And what is its ref_cloud_id property? What is extra, and what is its id_item property? It looks like extras is an empty mutable dictionary, so that part won't be the problem, but either i.ref_cloud_id or extra.id_item could cause a crash, depending on what those variables contain.
(To other readers: I realize this is not a complete answer, but I need the formatting of an answer in order to show code. Comments do not allow any formatting. Please forgive my mis-use of an "answer" in this case.)
I'm trying to iterate through an NSArray and check if an objectAtIndex is equal to a string.
NSLog(#"%#", myArray) // 3 items. 1 of them is "a"
for (id object in myArray)
{
NSLog(#"What"); // 3 times
if ([object isEqual:#"a"]) {
NSLog(#"Hello"); // Never gets executed
}
}
The problem is, the NSLog in the if statement never gets executed?
Edit
(
(
a
),
(
01
),
(
a
),
(
03
)
)
When I set it to isEqualToString, I get this error:
2015-03-30 14:42:54.206 MyApp[1575:50954] -[__NSArrayM isEqualToString:]: unrecognized selector sent to instance 0x7fe721ce3bf0
2015-03-30 14:42:54.215 MyApp[1575:50954] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayM isEqualToString:]: unrecognized selector sent to instance 0x7fe721ce3bf0'
Your problem is that you have an array that contains three sub-arrays, each of which contain, what is presumably, a single string. You can tell this because of the extra ()'s around the strings in the log output, and by the fact that it's telling you that you tried to send a selector to __NSArrayM.
Here is a quick fix:
NSLog(#"%#", myArray) // 3 items. 1 of them is "a"
for (NSArray *array in myArray)
{
NSLog(#"What"); // 3 times
if ([array.firstObject isEqualToString:#"a"])
{
NSLog(#"Hello"); // Never gets executed
}
}
But as others have pointed out you probably want to use isEqualToString: since it will be more performant.
You may also want to reconsider the code that is generating this nested array structure, or the schema that you're using in general, because it seems... unnecessary. Without further information there's not much to be done.
I am new to Obj-C and somehow I can get the output of a JSON-Request due to difficulties with arrays, dictionareis and syntax. It would be great if someone could get me on my way.
NSLog(#"JSON Feed: %#", self.classified);
NSDictionary *test = self.classified;
NSLog(#"andy %#", [test objectForKey:#"text"]);
this throws an exception :
JSON Feed: (
{
text = "test text";
}
)
2014-06-05 17:25:28.170 Nerdfeed[2321:4107] -[__NSCFArray objectForKey:]: unrecognized selector sent to instance 0x10b988da0
2014-06-05 17:25:28.173 Nerdfeed[2321:4107] * Terminating app due to uncaught exception
I now tried to find a solution for hours but cant fix it. Thank you so much for any help.
self.classified seems to be a NSArray with a single item (and not a NSDictionary). Try [[self.classified firstObject] objectForKey:#"text"]
I'm trying to receive a certain value in a json using AFNetworking. The value only contains digits and I want to receive it as a NSString. When I compare the received value, I get a exception (exception is also mentioned later in this post)
here is the coding producing the error.
NSArray *overallGameResultsArray = [resultDictionary valueForKey:#"overall_game_results"];
winCountDictionary = [[NSDictionary alloc] init];
for (NSDictionary *gameResultsDictionary in overallGameResultsArray)
{
NSString *userId = [gameResultsDictionary valueForKey:#"winner_user_id"];
NSString *winCount = [gameResultsDictionary valueForKey:#"win_count"];
if ([winCount isEqualToString:#"0"])
{
NSLog(#"0 wins");
}
}
I don't get the exception if the "if comparison" is commented. The win_count only consists of digits in the jSON response.
Following is the exception error I'm getting.
2012-10-10 15:41:35.086 FMB[3549:c07] -[__NSCFNumber isEqualToString:]: unrecognized selector sent to instance 0x7230af0 2012-10-10 15:41:35.086 FMB[3549:c07] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFNumber isEqualToString:]: unrecognized selector sent to instance 0x7230af0'
*** First throw call stack: (0x1638012 0x1345e7e 0x16c34bd 0x1627bbc 0x162794e 0x11e03 0x20583 0x1fab4 0x245053f 0x2462014 0x24527d5 0x15deaf5 0x15ddf44 0x15dde1b 0x26997e3 0x2699668 0x28d65c 0x2512 0x2445) libc++abi.dylib: terminate called throwing an exception
i think you'll have to do :
NSString *winCount=[NSString stringWithFormat:#"%d",[[gameResultsDictionary valueForKey:#"win_count"]intValue];
With this, you get the number value into the winCount NSString, and then you can use isEqualToString method
I suppose you use JSON. Then the type of the object is determined by JSON encoding. If there are " around, it's a string. If it's a number and you want string there, change how the data is encoded on the server.
However, in this context, using a number makes more sense. You should change the implementation in the following way.
NSNumber* winCount = [gameResultsDictionary valueForKey:#"win_count"];
if ([winCount intValue] == 0) { //this would actually work for both NSNumber and NSString
NSLog(#"0 wins");
}
Comparing numbers using string comparison is always a hint that you are doing something wrong.
The exception is thrown because you expect an object to be an NSString but actually is an NSNumber, so you try to call isEqualToString: on the NSNumber which doesn't implement the method.
Since you know that winCount is always a number and apparently the JSON deserializer that AFNetworking uses box the numbers in the response into NSNumber objects, you could easily grab a string out of the object like this:
NSString *winCount = [[gameResultsDictionary valueForKey:#"win_count"] stringValue];
Now you have a string representation of your number and you can therefor perform isEqualToString:
Also note that a more elegant solution might be to receive your objects as ids, find their class and do a comparison based on the class determined.