Illegal attempt to establish a relationship 'checklists' between objects in different contexts

Illegal attempt to establish a relationship 'checklists' between objects
in different contexts

I'm using Core Data for the offline storage of my iOS app, and I keep
getting the following error:
Illegal attempt to establish a relationship 'checklists' between objects
in different contexts
The problem is, I'm definitely using the same context to create the
relationship. Below is the block of code that is triggering the issue:
NSMutableSet *checklists = [[NSMutableSet alloc] init];
for (NSDictionary *dict in array){
Checklists *checklist = [self addChecklist:dict withContext:context];
[checklists addObject:checklist];
DLog(@"context: %@", checklist.managedObjectContext);
}
//Delete any lists that aren't from the server
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
Users *currentUser = (Users *)[self getUserWithId:[defaults
objectForKey:@"user_id"] withContext:context];
DLog(@"context: %@", context);
currentUser.checklists = checklists;
The exception is thrown at the last line, currentUser.checklists =
checklists. The log from the context is the same, and the objects are in
the same thread. Has anyone run into this before?
Code for addChecklist:withContext::
- (Checklists *) addChecklist:(NSDictionary *) dict
withContext:(NSManagedObjectContext *)context{
//Pull the list from the database and update
Checklists *checklist = [self getChecklistWithId:dict[@"_id"]
withContext:context];
//If the list doesn't exist, add it to the database
if(!checklist)
checklist = (Checklists *)[NSEntityDescription
insertNewObjectForEntityForName:@"Checklists"
inManagedObjectContext:context];
//Update or create the list attributes
checklist.checklist_id = dict[@"_id"] ? dict[@"_id"] : [NSString
stringWithFormat:@"%d", (arc4random() % 2000)];
checklist.desc = dict[@"description"] == [NSNull null] ? nil :
dict[@"description"];
checklist.name = dict[@"name"] == [NSNull null] ? nil : dict[@"name"];
checklist.published = dict[@"published"] == [NSNull null] ? 0 :
dict[@"published"];
checklist.created_at = dict[@"created_at"] == [NSNull null] ? nil :
dict[@"created_at"];
checklist.updated_at = dict[@"updated_at"] == [NSNull null] ? nil :
dict[@"updated_at"];
[self addChecklistSections:dict[@"checklist_sections"]
withChecklist:checklist withContext:context];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[self saveMasterContext];
return checklist;
}
Code for getUserWithId: withContext:
- (Users *) getUserWithId:(NSString *)user_id
withContext:(NSManagedObjectContext *) context
{
NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription
entityForName:@"Users" inManagedObjectContext:context];
[request setEntity:entity];
NSPredicate *pred = [NSPredicate predicateWithFormat:@"(user_id =
%@)", user_id];
[request setPredicate:pred];
NSError *error = nil;
NSMutableArray *users = [[context executeFetchRequest:request
error:&error] mutableCopy];
if (users == nil || users.count == 0) {
return nil;
}
return users[0];
}