NSUnknownKeyException [<NSCache 0x10f305700> valueForUndefinedKey:]

[trymbill]

I'm trying to save and return a cached (NSCache) subclassed PFObject called Transfer. When storing it (to debug this) I'm trying to fetch it from the cache right after to no avail, like this:

Transfer *transfer = subclassedPFObject;
NSLog(@"Transfer: %@", transfer);
[self.cache setObject:transfer forKey:[NSString stringWithFormat:@"transfer_%@", [transfer objectId]]];
NSLog(@"Cached: %@", [self.cache valueForKey:[NSString stringWithFormat:@"transfer_%@", [transfer objectId]]]);

It saves the cache OK, and I can verify that PFObject+NSCoding is being used to serialize the object. But when I try to return it from the cache, I get this error:

*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<NSCache 0x10f305700> valueForUndefinedKey:]: this class is not key value coding-compliant for the key transfer_eCEyjTqJUc.'

Here's how the object looks like when it gets saved to the cache:

Transfer: <Transfer:eCEyjTqJUc:(null)> {
    amount = 567;
    completedAt = "2014-03-27 06:15:21 +0000";
    from = "<PFUser:SoM3IdF0rUs3R>";
    isCharge = 0;
    isComplete = 1;
    likes =     (
        SoM3IdF0rUs3R
    );
    reason = Some text;
    to = "<PFUser:SoM3IdF0rUs3R>";
}

It doesn't seem to be firing (id)initWithCoder:(NSCoder*)aDecoder at all when fetching the object from the cache. It seems to be failing before it even reaches that method.

Am I missing something here? Any clues as to why it isn't able to fetch the object from the cache?

PS. Thanks for an awesome pod!

[martinrybak]

You may have already done this, but can you verify:

1. That they key transfer_eCEyjTqJUc exists in the cache.
2. That there is an object in the cache for that key.
3. What is the type of the object in cache...NSStringFromClass([object class])
4. That the object in the cache responds to NSCoding...[object respondsToSelector:@selector(initWithCoding:)]

[trymbill]

I may have dun goofed :) I was trying to fetch the object as a value, using valueForKey: instead of objectForKey:. I probably should've gone to sleep earlier yesterday :+1:

Confirming that this was my mistake, works fine when I try to fetch the object from the cache :)

[martinrybak]

It's happened to us all :)