I'd probably set the managed object as the delegate of your URL connection.  
NSURLConnection retains its delegate, and NSURLConnection is itself retained by 
the run loop, so you don't have to worry about the managed object disappearing 
from underneath you.  Then you can simply clean up the connection in the 
connection:didFailWithError: or connectionDidFinish: delegate methods.

Dave

On Sep 30, 2010, at 7:41 AM, Jonathan del Strother wrote:

> if my model refaults while a connection is in progress,
> the connection ought to carry on uploading.  After the connection has
> uploading, it doesn't actually need the model's attributes, so won't
> trigger a new fetch.  So where am I supposed to release the
> connection?

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