Core Data: Get Managed Object by unique part of the objectID

In my Core Data application, I need to get the pointers to different managed objects whose CoreData objectIDs end with the number I provide. e.g.:
Get the Person object whose objectID ends with unique number 317. The whole ID is:
<x-coredata://A3EDF6C1-229D-4658-A04E-598ADF1C749A/Person/p317>
or I need to get Department object, which ends with 5; again full ID is:
<x-coredata://A3EDF6C1-229D-4658-A04E-598ADF1C749A/Department/p5>
These numbers are actually primary keys in the SQLite database's tables and I can see them if I open the database directly with sqlite3, and I can of course select the records using SQL query;
*but I can not figure out how to get these objects using CoreData. I guess I should create the NSPredicate for the fetch request; but I don't know how to write the predicate which will give me the exact object based on the unique part of the objectID*
As I understand, objectIDs are not object's "normal" attributes.
Please help. Thanks in advance.

etresoft wrote:
DavidMan wrote:
*but I can not figure out how to get these objects using CoreData. I guess I should create the NSPredicate for the fetch request; but I don't know how to write the predicate which will give me the exact object based on the unique part of the objectID*
I think you are supposed to consider the entire ID to be unique. You can retrieve the associated object using "objectWithID:" from NSManagedObjectContext.
The problem is that I am parsing the text from another application and I have only the "unique part" at hand and not the whole objectID. So, I need to cope with that.
What I see is that the IDs of every entity start with the same text, e.g. here are the IDs of two different entities:
<x-coredata://A3EDF6C1-229D-4658-A04E-598ADF1C749A/Person/p317>
<x-coredata://A3EDF6C1-229D-4658-A04E-598ADF1C749A/Department/p5>
As you see, the difference is only in the end, after the entity names "Paper" and "Department". But this is my case and I am not completely sure that this will hold true for EVERY future installation on any system for every entity.
*Question: will the part like <x-coredata://A3EDF6C1-229D-4658-A04E-598ADF1C749A be constant for the particular installation, for every entity/object?*
If YES, then I will:
- after getting any/first object, extract the non-unique part, i.e. <x-coredata...749A which is the same for every object in this particular installation on this particular computer
- get the unique part, i.e. /Person/p317, /Person/p23, /Department/p5 etc.
- synthesize the "real ID" by appending these two strings
- ask managedObjectContext to return the object with this ID
- continue with the acquired object
How does it sound? Will this work on other computers?
P.S. FYI: the coredata of this program has only one store i.e. all the data are stored in single sqlite file.

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I'm currently struggling with a core data issue with my app that defies (my) logic. I'm sure I'm doing something wrong but can't see what. I am doing a basic executeFetchRequest on my core data entity, but the array of managed objects returned never seems to be released ONLY when I run it on the iPhone, under the simulator it works exactly as expected. This is despite using an NSAutoreleasePool to ensure the memory footprint is minimised. I have also checked with Instruments and there are no leaks, just ever increasing allocations of memory (by '[NSManagedObject(_PFDynamicAccessorsAndPropertySupport) allocWithEntity:]'). In my actual app this eventually leads to a didReceiveMemoryWarning call. I have produced a minimal program that reproduces the problem below. I have tried various things such as faulting all the objects before draining the pool, but with no joy. If I provide an NSError pointer to the fetch no error is returned. There are no background threads running.
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    if (host_statistics(host_port, HOST_VM_INFO, (host_info_t)&vm_stat, &host_size) != KERN_SUCCESS) {
        NSLog(@"Failed to fetch vm statistics");
        return 0;
    /* Stats in bytes */
    natural_t mem_free = vm_stat.free_count * pagesize;
    return mem_free;
- (void)viewDidLoad
    [super viewDidLoad];
    // Set up the edit and add buttons.
    self.navigationItem.leftBarButtonItem = self.editButtonItem;
    UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(insertNewObject)];
    self.navigationItem.rightBarButtonItem = addButton;
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    // Obtain the Managed Object Context
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    // Check the free memory before we start
    NSLog(@"INITIAL FREEMEM: %d", [RootViewController get_free_memory]);
    // Loop around a few times
    for(int i=0; i<20; i++) {
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        // Check the free memory each time around the loop
        NSLog(@"FREEMEM: %d", [RootViewController get_free_memory]);
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        // 'request' released after fetch to minimise use of autorelease pool
        NSFetchRequest *request = [[NSFetchRequest alloc] init];
        [request setEntity:entityDescription];
        // Perform the fetch
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        // Drain the pool - should release the fetched managed objects?
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    // Check the free menory at the end
    NSLog(@"FINAL FREEMEM: %d", [RootViewController get_free_memory]);
When I run the above on the simulator I get the following output (which looks reasonable to me):
2011-06-06 09:50:28.123 renniksoft[937:207] INITIAL FREEMEM: 14782464
2011-06-06 09:50:28.128 renniksoft[937:207] FREEMEM: 14807040
2011-06-06 09:50:28.135 renniksoft[937:207] FREEMEM: 14831616
2011-06-06 09:50:28.139 renniksoft[937:207] FREEMEM: 14852096
2011-06-06 09:50:28.142 renniksoft[937:207] FREEMEM: 14872576
2011-06-06 09:50:28.146 renniksoft[937:207] FREEMEM: 14897152
2011-06-06 09:50:28.149 renniksoft[937:207] FREEMEM: 14917632
2011-06-06 09:50:28.153 renniksoft[937:207] FREEMEM: 14938112
2011-06-06 09:50:28.158 renniksoft[937:207] FREEMEM: 14962688
2011-06-06 09:50:28.161 renniksoft[937:207] FREEMEM: 14983168
2011-06-06 09:50:28.165 renniksoft[937:207] FREEMEM: 14741504
2011-06-06 09:50:28.168 renniksoft[937:207] FREEMEM: 14770176
2011-06-06 09:50:28.174 renniksoft[937:207] FREEMEM: 14790656
2011-06-06 09:50:28.177 renniksoft[937:207] FREEMEM: 14811136
2011-06-06 09:50:28.182 renniksoft[937:207] FREEMEM: 14831616
2011-06-06 09:50:28.186 renniksoft[937:207] FREEMEM: 14589952
2011-06-06 09:50:28.189 renniksoft[937:207] FREEMEM: 14610432
2011-06-06 09:50:28.192 renniksoft[937:207] FREEMEM: 14630912
2011-06-06 09:50:28.194 renniksoft[937:207] FREEMEM: 14651392
2011-06-06 09:50:28.197 renniksoft[937:207] FREEMEM: 14671872
2011-06-06 09:50:28.200 renniksoft[937:207] FREEMEM: 14692352
2011-06-06 09:50:28.203 renniksoft[937:207] FINAL FREEMEM: 14716928
However, when I run it on an actual iPhone 4 (4.3.3) I get the following result:
2011-06-06 09:55:54.341 renniksoft[4727:707] INITIAL FREEMEM: 267927552
2011-06-06 09:55:54.348 renniksoft[4727:707] FREEMEM: 267952128
2011-06-06 09:55:54.702 renniksoft[4727:707] FREEMEM: 265818112
2011-06-06 09:55:55.214 renniksoft[4727:707] FREEMEM: 265355264
2011-06-06 09:55:55.714 renniksoft[4727:707] FREEMEM: 264892416
2011-06-06 09:55:56.215 renniksoft[4727:707] FREEMEM: 264441856
2011-06-06 09:55:56.713 renniksoft[4727:707] FREEMEM: 263979008
2011-06-06 09:55:57.226 renniksoft[4727:707] FREEMEM: 264089600
2011-06-06 09:55:57.721 renniksoft[4727:707] FREEMEM: 263630848
2011-06-06 09:55:58.226 renniksoft[4727:707] FREEMEM: 263168000
2011-06-06 09:55:58.726 renniksoft[4727:707] FREEMEM: 262705152
2011-06-06 09:55:59.242 renniksoft[4727:707] FREEMEM: 262852608
2011-06-06 09:55:59.737 renniksoft[4727:707] FREEMEM: 262389760
2011-06-06 09:56:00.243 renniksoft[4727:707] FREEMEM: 261931008
2011-06-06 09:56:00.751 renniksoft[4727:707] FREEMEM: 261992448
2011-06-06 09:56:01.280 renniksoft[4727:707] FREEMEM: 261574656
2011-06-06 09:56:01.774 renniksoft[4727:707] FREEMEM: 261148672
2011-06-06 09:56:02.290 renniksoft[4727:707] FREEMEM: 260755456
2011-06-06 09:56:02.820 renniksoft[4727:707] FREEMEM: 260837376
2011-06-06 09:56:03.334 renniksoft[4727:707] FREEMEM: 260395008
2011-06-06 09:56:03.825 renniksoft[4727:707] FREEMEM: 259932160
2011-06-06 09:56:04.346 renniksoft[4727:707] FINAL FREEMEM: 259555328
The amount of free memory reduces each time round the loop in proportion to the managed objects I fetch e.g. if I fetch twice as many objects then the free memory reduces twice as quickly - so I'm pretty confident it is the managed objects that are not being released. Note that the entities that are being fetched are very basic, just two attributes, a string and a 16 bit integer. There are 1000 of them being fetched in the examples above. The code I used to generate them is as follows:
// Create test entities
for(int i=0; i<1000; i++) {
    id entity = [NSEntityDescription insertNewObjectForEntityForName:@"TestEntity" inManagedObjectContext:context];
    [entity setValue:[NSString stringWithFormat:@"%d",i] forKey:@"name"];
    [entity setValue:[NSNumber numberWithInt:i] forKey:@"value"];
if (![context save:nil]) {
    NSLog(@"Couldn't save");
If anyone can explain to me what is going on I'd be very grateful! This issue is the only only one holding up the release of my app. It works beautifully on the simulator!!
Please let me know if there's any more info I can supply.

Update: I modified the above code so that the fetch (and looppool etc.) take place when a timer fires. This means that the fetches aren't blocked in viewDidLoad.
The result of this is that the issue happens exactly as before, but the applicationDidReceiveMemoryWarning is fired as expected:
2011-06-08 09:54:21.024 renniksoft[5993:707] FREEMEM: 6131712
2011-06-08 09:54:22.922 renniksoft[5993:707] Received memory warning. Level=2
2011-06-08 09:54:22.926 renniksoft[5993:707] applicationDidReceiveMemoryWarning
2011-06-08 09:54:22.929 renniksoft[5993:707] FREEMEM: 5615616
2011-06-08 09:54:22.932 renniksoft[5993:707] didReceiveMemoryWarning
2011-06-08 09:54:22.935 renniksoft[5993:707] FREEMEM: 5656576

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ok.
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Message was edited by: Edward Devlin1

Hi kids, yet again I have answered my own question. in my application, I could not make my object graph self populate, and then when i did get it to populate programatically, I could not access the data.
I have solved both problems. one was a conceptual problem, and the other was operator error building off of a conceptual problem.
first, lets tackle why my object graph doesn't auto populate. in IB i made an Object controller, and I hooked it up to my entity. I told the controller to automatically prepare content. I had assumed that it meant that when my Object Context was instantiated, it would automatically create an instance of my referenced object. this is Not how core data works. Currently i am working under the impression that "automatically prepares content" mean that when an entity is instantiated, it will fill out the appropriate values, with the defaults you set up in your object model.
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This is called a fetch request. Its a much more elaborate way to look for stuff than a simple objectForKey: method. its how you get your information from core data. Information comes back as an array of NSManagedObjects. The documentation made everything so much more difficult because it spoke of fetched values as something extra or added on to core data. Kids say it along w/ me.... fetch requests are how you get info from core data. repeat.

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The query of the extraction is to extract the annoucement that is posted for day. Once the summary is generated, an email will be sent out to users with the extracted data.
How can i have part of the content of each announcement extracted using c# in visual studio 2013?

May be you can plan to extract all the data from list and then filter the content you are looking for
http://stackoverflow.com/questions/490968/how-do-you-read-sharepoint-lists-programatically
You have several options both of which are going to require further research on your part they are:
Use the SharePoint object model (Microsoft.Sharepoint.dll), you must be on a PC within the SharePoint farm.
Use the SharePoint web services which can be found at SiteURL/_vti_bin/ you might want to start with Lists.asmx and work from there.
You are going to need some further research as I have said, but remember GIYF.

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Core Data: Get Managed Object by unique part of the objectID

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