Hi,
I'm developing an application for iPhone where the persistence is
managed with CoreData. I've introduced a singleton to initialize and
manage the NSManagedObjectContext, this is how I've defined the
singleton:
static Persistence *singletonPersistence = nil;
@implementation Persistence
+ (void)initSingletonWithDataStoreName:(NSString*)aDataStoreName {
[singletonPersistence release];
singletonPersistence = nil;
singletonPersistence = [[Persistence alloc]
initWithDataStoreName:aDataStoreName];
}
+ (Persistence*)singleton {
return singletonPersistence;
}
In my NSManagedObjects I've introduced a static constructor that
associate the object with the context of the singleton:
+ (id)persistentFeed {
return [NSEntityDescription insertNewObjectForEntityForName:@"Feed"
inManagedObjectContext:[Persistence singleton].managedObjectContext];
}
I've written some tests with SenTestCase: in setUp a new db is created
and in tearDown is removed. In a new test where several managed
objects are associated each other I've the following error:
Unknown.m:0: error: -[FeedTest testUpdateEntries] : Illegal attempt to
establish a relationship 'feed' between objects in different contexts
(source = <Entry: 0x411da20> (entity: Entry; id: 0x411daa0
<x-coredata:///Entry/t508D0501-EC29-423E-A87E-E9410DD4ACD721> ; data:
{
authorUsername = "jean_1971_2";
feed = 0x4118040
<x-coredata:///Feed/t508D0501-EC29-423E-A87E-E9410DD4ACD720>;
publishTime = 2010-02-15 19:20:17 +0100;
text = "Xxxxx\nxxxxx\nxxxxx\nxxxxx";
}) , destination = <Feed: 0x4118560> (entity: Feed; id: 0x16d0f0
<x-coredata:///Feed/t508D0501-EC29-423E-A87E-E9410DD4ACD717> ; data: {
feedId = "tag:twitter.com,2007:Status";
title = "Twitter / jean_1971 with friends";
updateTime = "2010-02-26T10:30:20+00:00";
user = 0x4118d10
<x-coredata:///User/t508D0501-EC29-423E-A87E-E9410DD4ACD718>;
}))
It seems as the managed objects are built with different context but
for each object I've used the context referenced in the singleton.
Debugging I've found out that the reference of the static variable
that keep the singleton (singletonPersistence) changes in the
following manner:
1 - at the start of the test is called the method
initSingletonWithDataStoreName and the variable take a value, ex.
0x41001d0
2 - the method singleton is called several times and the static
variable always return that value
3 - Suddenly (without a call to initSingletonWithDataStoreName) the
value to singleton changes, ex. 0x11ac70, and then is used a different
context
4 - at the end of the test the value of the static variabile return the former
How is possible this behaviour? I thought a static variable in a
module may be changed only in the module.
Any suggestion?
Thanks.
Jean
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