>> I found a bug a couple weeks back where I had a DB structure that had
>> this odd table hanging around where the only field was the primary
>> key, which was also a foreign key. I found at the time that you could
>> create a new() on that object, which would save() fine. But if you
>> ever wanted to call save() a second time, it would fail because the
>> SQL generated is something like:
>>
>> UPDATE foo SET  WHERE id = ?;
>>
>> This obviously fails.
>
> What database are you using?

Sorry, Postgres.

>> Anyway, I'm now seeing the same problem again when you use save
>> (changes_only => 1), but there were no changes. It generates the same
>> SQL as above because it always seems to think the primary key is a
>> modified field.
>>
>> my $foo = My::Foo->new(id => 1);
>> $foo->load;
>> $foo->save(changes_only => 1);
>>
>> Because we created foo by setting id to 1, it thinks "id" is a
>> modified field.
>
> Is the id field auto-incremented, or just an int?

I have tried both, it doesn't seem to matter. And I don't see why it  
should. I'm not modifying the "id" field at all.

regards,
Danial

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