Adding details I seem to have left out. The id is defined like this:
id = models.UUIDField(primary_key=True, default=uuid.uuid1, editable=False)
and I'm running on PostgreSQL.
I'm pretty sure I never create a row without already having the key.

On Monday, February 12, 2018 at 1:00:53 PM UTC-8, M Mackey wrote:
> I've run into a strange issue with using a UUID as primary key, and I'm 
> hoping we can either verify this is a bug, or figure out what I've done 
> wrong.
> I've got a core model object with a UUID for it's primary key. (Generated 
> external to this system, thus using that for when additional information 
> comes in.) And there are other model objects referencing it. Normally 
> everything runs fine. But after a while, web pages that have been running 
> fine start telling me that the UUID isn't valid (even though it is). (Sorry 
> I don't have a copy of the error at this moment, I'll post here when it 
> happens again.) I know it's not a simple coding error, because I can simply 
> restart Apache and everything is fine again. And these aren't POST 
> responses or anything complex like that. It occurs on a simple listing page.
> When I dig into the exceptions, I see something that seems contradictory. 
> It looks like the UUID constructor has been called with an instance of a 
> UUID (it says type UUID doesn't have method 'replace'). But it doesn't seem 
> like that should be possible because the code that calls that constructor 
> first checks the type. (See django/db/models/fields/ - 
> UUIDField.to_python)
> So it's a double head scratcher. Once this problem crops up, I have to 
> restart the web server (but then it's okay for a while). And the errors it 
> gives me don't make much sense.
> I don't know what kind of caching problem it could be - I haven't enabled 
> any of the available caching systems. Also doesn't seem to crop up (at 
> least not as often) in the built in dev test server.
> Anyone seen this, or have any ideas?
> Thanks,
> M

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