[Dbix-class] discard_changes upgrade.

[Matt S Trout]

On Mon, Apr 14, 2008 at 01:00:19PM +0400, Vladimir Timofeev wrote:
> Anyway next patch: reset in_storage property in case row gone away
> from db, test it also

You aren't using the ident_condition method; please do that instead of
constructing from primary_columns yourself - otherwise you're going to
die screaming if the user's changed the PK

Not sure if I like using HashRefInflator for this, but I'm not sure I
can see a more elegant approach either.

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