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  • Relationship Modelling in Core Data

    - by Stevie
    Hi there, I'm fairly new to Objective C and Core Data and have a problem designing a case where players team up one-on-one and have multiple matches that end up with a specific result. With MySQL, I would have a Player table (player primary key, name) and a match table (player A foreign key, player B foreign key, result). Now how do I do this with Core Data? I can easily tie a player entity to a match entity using a relationship. But how do I model the inverse direction for the second player ref. in the match entity? Player Name: Attribute Match: Relationship Match Match Result: Attribute PlayerA: Relationship to Player (<- Inverse to Player.Match) PlayerB: Relationship to Player (<- Inverse to ????) Would be great if someone could give me an idea on this! Thanks, Stevie.

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  • Add Core Data Index to certain Attributes via migration

    - by steipete
    For performance reasons, i want to set the Indexed Attribute to some of my entities. I created a new core data model version to perform the changes. Core Data detects the changes and migrates my model to the new version, however, NO INDEXES ARE GENERATED. If I recreate the database from scratch, the indexes are there. I checked with SQLite Browser both on the iPhone and on the Simulator. The problem only occurs if a database in the prior format is already there. Is there a way to manually add the indexes? Write some sql for that? Or am I missing something? I did already some more critical migrations, no problems there. But those missing indexes are bugging me. Thanks for helping!

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  • Producer Consumer Issue with Core Data

    - by Mugunth Kumar
    I've a Core Data application. In the producer thread, I pull data from a web service and store it in my object and call save. My consumer object is a table view controller that displays the same. However, the app crashes and I get NSFetchedResultsController Error: expected to find object (entity: FeedEntry; id: 0xf46f40 ; data: ) in section (null) for deletion on the console. When I debug it, everything works fine. So I understood that it's like a race issue. How is these kind of problem solved? What's the best way to design a producer-consumer app with core-data?

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  • using core data with web services

    - by Jayshree
    Hi. i am a noob in xcode. I am developing an iphone app where i need to send and receive data from a web service. And i need to store them temporarily in my app. i dont want to use sqlite. so i was wondering if i should use core data for this purpose. I read some articles but i still dont have a clear picture of how to do it, coz i have used core data only with sqlite. I want to do the following things : Will receive table data from a web service. Have to perform certain calculations on those fields. Will send the data back in xml format to the server. How do i convert the xml data into int, date or any other data type? and how do i store it in managed data objects? Can anyone please help me with this??? thnx for your time.

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  • Core Data and Relationships

    - by alku83
    I have two objects, a Trip and a Place. A Trip represents a journey from one Place to another Place, ie. a Trip needs a fromPlace and a toPlace. So, this is a 1-to-2 relationship, but I need to know which is the "from" and which is the "to". I am not sure how to model this in Core Data. I have created two entities (Trip, Place), and now I want to setup the relationship(s) so I have a fromPlace and a toPlace. Do I need to add an extra field on the Place entity called isFrom, or similar? If this was in a database, I would just have a id column on the Place table, and then two columns in the Trip table - fromPlaceId and toPlaceId. How do I achieve something similar in Core Data?

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  • How can I compare Core Data models?

    - by Don
    I noticed while doing system testing that a feature of our app had been removed. It looks like at some point, an older version of a file was checked into SVN that was missing a property. This specific file was generated from the Core Data model, and sure enough, the latest version of the model in SVN is missing the same attribute. I need to find out if any other attributes are missing, or if anything else in the model changed. However, the elements file in the .xcodedatamodel folder appears to binary and I can't compare the revisions. Is there a way to find the differences between two Core Data models in SVN? Barring that, what would be the best way to accomplish this task?

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  • copy file from one location to another location in linux using java program

    - by Mouli
    Using JSP am trying to move customer logo into another location in linux but its not working. thanks in advance Here is my program String customerLogo = request.getParameter("uploadCustomerLogo").trim(); StringBuffer absoluteFolderPath = new StringBuffer(); absoluteFolderPath.append("/zoniac"); absoluteFolderPath.append("/Companies/"); absoluteFolderPath.append("companyCode/"); absoluteFolderPath.append("custom/"); String destination = absoluteFolderPath.toString(); File sourcefile = new File(customerLogo); File destfile = new File(destination+sourcefile.getName()); FileUtils.copyFile(sourcefile,destfile);

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  • File location for config file to app installed to local user location

    - by user54064
    I have a WinForm app that has inside of the app's config file locations to find files for the app to use as it runs. However, the app will be installed locally for each user so it can't be hard coded. For Vista and Windows 7 the installer puts the app in c:\users\\Documents area. Under Windows XP it puts it in a different location. How can I write the config file to use some sort of placeholder to be filled in at runtime with the specific user's information? I am just using the default areas that Windows wants to install a per-user install but need the config file to be flexible at runtime for the specific user.

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  • Adding single row one by one in tableview from core data of iPhone

    - by user336685
    I am working on RSS reader code where articles get downloaded and are viewable offline. The problem is only after all articles are downlaoded the tableview containing headlines gets updated. Core data is used. So everytime NSobjectcontext is saved , [self tableview updatebegins ] is called.The table is getting updated via fetchcontroller core data. I tried saving NSobjectcontext everytime an article is saved but that is not updating the tableview. I want a mechanism similar to instapaper tableview where articles get saved and tableview gets updated immediately. Please help if you know the solution. Thanks in advance.

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  • How to view existing data in Core Data?

    - by mshsayem
    Well, may be this question is silly, but I couldn't find a way (except programmatically). I built a project (for iPhone OS 3.0) which uses Core Data. The xcdatamodel file shows the schema description, but I want to see the data in tabular form (like the management studio for mssql server or phpmyadmin for mysql). Is there any way (except coding)? What is that? Also, which file (in disk/device) those data are stored into? [ I built the tutorial (from apple) on Core Data, named Locations. They used this line somewhere in the code: NSURL *storeUrl = [NSURL fileURLWithPath: [[self applicationDocumentsDirectory] stringByAppendingPathComponent: @"Locations.sqlite"]]; But, I did not see any "xxxxx.sqlite" file in project location (nor in the disk).]

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  • Core Data produces Analyzer warnings

    - by RickiG
    Hi I am doing the final touch ups on an app and I am getting rid of every compiler/analyzer warning. I have a bunch of Class methods that wrap my apps access to Core Data entities. This is "provoking" the analyzer. + (CDProductEntity*) newProductEntity { return (CDProductEntity*)[NSEntityDescription insertNewObjectForEntityForName:@"CDProductEntity" inManagedObjectContext:[self context]]; } Which results in an Analyzer warning: Object with +0 retain counts returned to caller where a +1 (owning) retain count is expected In the method that calls the above Class Method I have this: CDProductEntity *newEntity = [self newProductEntity]; Which results in an Analyzer warning: Method returns an Objective-C object with a +1 retain count (owning reference) Explicitly releasing or autoreleasing a Core Data entity is usually very very bad, but is that what it is asking me to do here? First it tells me it has a +0 retain count and that is bad, then it tells me it has a +1 which is also bad. What can I do to ensure that I am either dealing with a Analyzer hiccup or that I release correctly? Thanks in advance

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  • EXC_MEMORY_ACCESS when trying to delete from Core Data ($cash solution)

    - by llloydxmas
    I have an application that downloads an xml file, parses the file, and creates core data objects while doing so. In the parse code I have a function called 'emptydatacontext' that removes all items from Core Data before creating replacements items from the xml data. This method looks like this: -(void) emptyDataContext { NSFetchRequest * allCon = [[NSFetchRequest alloc] init]; [allCon setEntity:[NSEntityDescription entityForName:@"Condition" inManagedObjectContext:managedObjectContext]]; NSError * error = nil; NSArray * conditions = [managedObjectContext executeFetchRequest:allCon error:&error]; DebugLog(@"ERROR: %@",error); DebugLog(@"RETRIEVED: %@", conditions); [allCon release]; for (NSManagedObject * condition in conditions) { [managedObjectContext deleteObject:condition]; } // Update the data model effectivly removing the objects we removed above. //NSError *error; if (![managedObjectContext save:&error]) { DebugLog(@"%@", [error domain]); } } The first time this runs it deletes all objects and functions as it should - creating new objects from the xml file. I created a 'update' button that starts the exact same process of retrieving the file the proceeding with the parse & build. All is well until its time to delete the core data objects. This 'deleteObject' call creates a "EXC_BAD_ACCESS" error each time. This only happens on the second time through. Captured errors return null. If I log the 'conditions' array I get a list of NSManagedObjects on the first run. On the second this log request causes a crash exactly as the deleteObject call does. I have a feeling it is something very simple I'm missing or not doing correctly to cause this behavior. The data works great on my tableviews - its only when trying to update I get the crashes. I have spent days & days on this trying numerous alternative methods. Whats left of my hair is falling out. I'd be willing to ante up some cash for anyone willing to look at my code and see what I'm doing wrong. Just need to get past this hurdle. Thanks in advance for the help!

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  • android, find the nearest location without going through all the locations

    - by Marwan
    I am building a taxi dispatching app first: I need the passenger app to show the nearest taxis, now I know how to do that in code but in my way I have to go through all the taxis locations(in database on server) and calculate the distance from the passenger location and get the lowest ones - I don't want to do this because there will be a lot of taxis and going through all of them and making some math is kind of pain on the server- is there a way to get the nearest ones without going through all of them? second: what the best database to use - first, should it be sql or non-sql - I need a very robust database, because there will be a lot of updates (I mean the passengers locations added then deleted when arriving to destination && the taxis location changes frequently) finally: I will use RubyOnRails to do the server side and json as data transfer format, do you have a recommendation to me on something better? Thanks

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  • Connection to .mdb file fails on windows 2008 core - 32bit

    - by amritad
    Hi, I have an application where I am doing connection with .mdb file. Here are the steps we are following : Creating object for database utils inteface Calling the connect() function, to get connected to the database whose extension is .mdb file Above flow is working correct on all windows platform but not on windows server 2008 CORE 32-bit. I also checked whether the ODBC drivers are installed or not, by opening regedit. I found that all drivers specially Microsoft access driver (*.mdb) is installed. ANd I think it is by default get installed while installing OS. Is anyone aware of any thing about ODBC drivers and connectivity to the database (like .mdb) on windows 2008 CORE ( which runs only on command line and no interface)

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  • window.location call popup up empty dialog on safari

    - by memical
    Hi, on a web page i am trying to redirect the browser to another page on the same site. the code is very simple for that: window.location = "/path1/path2" on safari - both windows as well as mac - a message box containing only the text "http://domain.com" comes up. I have tried different ways of specifying this: location.href, windows.assign(...) ... and the all have the same behavior. Did any of you see this? and do you have a solution for this? Thanks.

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  • Core Data strategy using in memory cache, or no core data at all?

    - by randombits
    I have a user interface where the user can check off a bunch of items from a tableview, almost like a todo list. The items are populated from a Core Data stack. I need to be able to take all of the items they're clicking through and put them into a "temporary" shopping cart. Once they're in the shopping cart, users can go through the list and remove the items, or just submit them to a server. The thing is, the selected items are temporary just like an internet based shopping cart. It's nothing something that gets persisted once the application closes. Once the view is no longer in display, I can assume that the shopping cart is safe to discard. What's the best way to approach this? Since the user is essentially clicking on instances that map back to a Core Data entity .. should I setup a different persistence store such as in memory and add that store to my managed object context?

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  • PHP "header (location)" isnide IFRAME, to load in _top location?

    - by Spoonk
    Hi Webmasters. I have a simple form which is inside IFRAME. When user click on SUBMIT, it redirects to a specific page on my server. The function I use for the redirect is header ('Location: mypage2.html'); exit (); But I want the new page to open in _top location, not inside the same IFRAME that I use. How can I tell the browser to open the new page in _top not inside the IFRAME? Thanks in advance.

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  • AMD Phenom II X2 555 BE, core unlock suddenly not working?

    - by user328271
    I've had a Phenom II X2 555 BE for around 2 - 3 years. When I got it, I immediately core unlocked it with my ECS A880GM-A3 mobo, which makes it turn into a Phenom II X4 B55. A few days ago, I installed Windows 7 64 bit to compensate for my 4 gigs of ram. When I start my system with its cores unlocked, it will restart after the BIOS screen. If I disable the core unlock, it boots to OS just fine. My question is: Does 64 bit OS makes a difference in core unlocking? Does my 3rd and 4th core burnt out? Also extra info: I tried core unlocking but keeping the 3rd and 4th core disabled and it still won't boot into OS. Could it be motherboard problems? Sorry for bad English. I will try to give additional information if needed. Thanks! Also it is worth mentioning I'm no computer expert but I tried to make my explanation as short as possible. I also asked my question on TomsHardware, but I had no answer till now so I decided to ask here too. anyone...?

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  • How to populate a core data store programmatically?

    - by jdmuys
    I have ran out of hairs to pull with a crash in this routine that populates a core data store from a 9000+ line plist file. The crash happened at the very end of the routine inside the call to [managedObjectContext save:&error]. While if I save after every object insertion, the crash doesn't happen. Of course, saving after every object insertion totally kills the performance (from less than a second to many minutes). I modified my code so that it saves every K insertions, and the crash happens as soon as K = 2. The crash is an out-of-bound exception for an NSArray: Serious application error. Exception was caught during Core Data change processing: *** -[NSCFArray objectAtIndex:]: index (1) beyond bounds (1) with userInfo (null) Also maybe relevant, when the exception happen, my fetch result controller controllerDidChangeContent: delegate routine is in the call stack. It simply calls my table view endUpdate routine. I am now running out of ideas. How am I supposed to populate a core data store with a table view? Here is the call stack: #0 0x901ca4e6 in objc_exception_throw #1 0x01d86c3b in +[NSException raise:format:arguments:] #2 0x01d86b9a in +[NSException raise:format:] #3 0x00072cb9 in _NSArrayRaiseBoundException #4 0x00010217 in -[NSCFArray objectAtIndex:] #5 0x002eaaa7 in -[UITableView(_UITableViewPrivate) _endCellAnimationsWithContext:] #6 0x002def02 in -[UITableView endUpdates] #7 0x00004863 in -[AirportViewController controllerDidChangeContent:] at AirportViewController.m:463 #8 0x01c43be1 in -[NSFetchedResultsController(PrivateMethods) _managedObjectContextDidChange:] #9 0x0001462a in _nsnote_callback #10 0x01d31005 in _CFXNotificationPostNotification #11 0x00011ee0 in -[NSNotificationCenter postNotificationName:object:userInfo:] #12 0x01ba417d in -[NSManagedObjectContext(_NSInternalNotificationHandling) _postObjectsDidChangeNotificationWithUserInfo:] #13 0x01c03763 in -[NSManagedObjectContext(_NSInternalChangeProcessing) _createAndPostChangeNotification:withDeletions:withUpdates:withRefreshes:] #14 0x01b885ea in -[NSManagedObjectContext(_NSInternalChangeProcessing) _processRecentChanges:] #15 0x01bbe728 in -[NSManagedObjectContext save:] #16 0x000039ea in -[AirportViewController populateAirports] at AirportViewController.m:112 Here is the code to the routine. I apologize because a number of lines are probably irrelevant, but I'd rather err on that side. The crash happens the very first time it calls [managedObjectContext save:&error]: - (void) populateAirports { NSBundle *meBundle = [NSBundle mainBundle]; NSString *dbPath = [meBundle pathForResource:@"DuckAirportsBin" ofType:@"plist"]; NSArray *initialAirports = [[NSArray alloc] initWithContentsOfFile:dbPath]; //********************************************************************************* // get existing countries NSMutableDictionary *countries = [[NSMutableDictionary alloc] initWithCapacity:200]; NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Country" inManagedObjectContext:managedObjectContext]; [fetchRequest setEntity:entity]; NSError *error = nil; NSArray *values = [managedObjectContext executeFetchRequest:fetchRequest error:&error]; if (!values) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } int numCountries = [values count]; NSLog(@"We have %d countries in store", numCountries); for (Country *aCountry in values) { [countries setObject:aCountry forKey:aCountry.code]; } [fetchRequest release]; //********************************************************************************* // read airports int numAirports = 0; int numUnsavedAirports = 0; #define MAX_UNSAVED_AIRPORTS_BEFORE_SAVE 2 numCountries = 0; for (NSDictionary *anAirport in initialAirports) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; NSString *countryCode = [anAirport objectForKey:@"country"]; Country *thatCountry = [countries objectForKey:countryCode]; if (!thatCountry) { thatCountry = [NSEntityDescription insertNewObjectForEntityForName:@"Country" inManagedObjectContext:managedObjectContext]; thatCountry.code = countryCode; thatCountry.name = [anAirport objectForKey:@"country_name"]; thatCountry.population = 0; [countries setObject:thatCountry forKey:countryCode]; numCountries++; NSLog(@"Found %dth country %@=%@", numCountries, countryCode, thatCountry.name); } // now that we have the country, we create the airport Airport *newAirport = [NSEntityDescription insertNewObjectForEntityForName:@"Airport" inManagedObjectContext:managedObjectContext]; newAirport.city = [anAirport objectForKey:@"city"]; newAirport.code = [anAirport objectForKey:@"code"]; newAirport.name = [anAirport objectForKey:@"name"]; newAirport.country_name = [anAirport objectForKey:@"country_name"]; newAirport.latitude = [NSNumber numberWithDouble:[[anAirport objectForKey:@"latitude"] doubleValue]]; newAirport.longitude = [NSNumber numberWithDouble:[[anAirport objectForKey:@"longitude"] doubleValue]]; newAirport.altitude = [NSNumber numberWithDouble:[[anAirport objectForKey:@"altitude"] doubleValue]]; newAirport.country = thatCountry; // [thatCountry addAirportsObject:newAirport]; numAirports++; numUnsavedAirports++; if (numUnsavedAirports >= MAX_UNSAVED_AIRPORTS_BEFORE_SAVE) { if (![managedObjectContext save:&error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } numUnsavedAirports = 0; } [pool release]; }

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  • Adding Core Data to existing iPhone project

    - by swalkner
    I'd like to add core data to an existing iPhone project, but I still get a lot of compile errors: NSManagedObjectContext undeclared Expected specifier-qualifier-list before 'NSManagedObjectModel' ... I already added the Core Data Framework to the target (right click on my project under "Targets", "Add" - "Existing Frameworks", "CoreData.framework"). My header-file: NSManagedObjectModel *managedObjectModel; NSManagedObjectContext *managedObjectContext; NSPersistentStoreCoordinator *persistentStoreCoordinator; [...] @property (nonatomic, retain, readonly) NSManagedObjectModel *managedObjectModel; @property (nonatomic, retain, readonly) NSManagedObjectContext *managedObjectContext; @property (nonatomic, retain, readonly) NSPersistentStoreCoordinator *persistentStoreCoordinator; What am I missing? Starting a new project is not an option... Thanks a lot! edit sorry, I do have those implementations... but it seems like the Library is missing... the implementation methods are full with compile error like "managedObjectContext undeclared", "NSPersistentStoreCoordinator undeclared", but also with "Expected ')' before NSManagedObjectContext" (although it seems like the parenthesis are correct)... #pragma mark - #pragma mark Core Data stack /** Returns the managed object context for the application. If the context doesn't already exist, it is created and bound to the persistent store coordinator for the application. */ - (NSManagedObjectContext *) managedObjectContext { if (managedObjectContext != nil) { return managedObjectContext; } NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator]; if (coordinator != nil) { managedObjectContext = [[NSManagedObjectContext alloc] init]; [managedObjectContext setPersistentStoreCoordinator: coordinator]; } return managedObjectContext; } /** Returns the managed object model for the application. If the model doesn't already exist, it is created by merging all of the models found in application bundle. */ - (NSManagedObjectModel *)managedObjectModel { if (managedObjectModel != nil) { return managedObjectModel; } managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain]; return managedObjectModel; } /** Returns the persistent store coordinator for the application. If the coordinator doesn't already exist, it is created and the application's store added to it. */ - (NSPersistentStoreCoordinator *)persistentStoreCoordinator { if (persistentStoreCoordinator != nil) { return persistentStoreCoordinator; } NSURL *storeUrl = [NSURL fileURLWithPath: [[self applicationDocumentsDirectory] stringByAppendingPathComponent: @"Core_Data.sqlite"]]; NSError *error = nil; persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]]; if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:nil error:&error]) { /* Replace this implementation with code to handle the error appropriately. abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. If it is not possible to recover from the error, display an alert panel that instructs the user to quit the application by pressing the Home button. Typical reasons for an error here include: * The persistent store is not accessible * The schema for the persistent store is incompatible with current managed object model Check the error message to determine what the actual problem was. */ NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } return persistentStoreCoordinator; }

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