How to get the sm_owner User object using StackMob as backend - iphone

Question

I find out the User has a sm_owner field. But how do I get the user using sm_owner. My code is like this:
[self.client getLoggedInUserOnSuccess:^(NSDictionary *result) {
NSString *currentLogginedUser = [result valueForKey:#"sm_owner"];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"User" inManagedObjectContext:self.managedOjbectContext];
[request setEntity:entity];
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"sm_owner like user/%#", currentLogginedUser];
[request setPredicate:predicate];
self.user = [[self.managedOjbectContext executeFetchRequest:request error:nil] objectAtIndex:0];
} onFailure:^(NSError *error) {
}];
And the crash message is:reason: 'Unimplemented SQL generation for predicate (sm_owner LIKE user / "user/test")'

Answer 1

I'm the platform Evangelist for StackMob.
The result from the getLoggedInUserOnSuccess method normally contains primary key "username". So the following code should work.
[self.client getLoggedInUserOnSuccess:^(NSDictionary *result) {
NSString *currentLogginedUser = [result objectForKey:#"username"];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"User" inManagedObjectContext:self.managedOjbectContext];
[request setEntity:entity];
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"username == %#", currentLogginedUser];
[request setPredicate:predicate];
self.user = [[self.managedOjbectContext executeFetchRequest:request error:nil] objectAtIndex:0];
} onFailure:^(NSError *error) {
}];
Alternatively, if you rather grab the sm_owner from the NSDictionary result. I would do the following.
NSString *sm_owner = [result valueForKey:#"sm_owner"];
NSArray *myArray = [sm_owner componentsSeparatedByString:#"/"];
NSString *currentLogginedUser = [myArray objectAtIndex:1];
Then perform your fetch.