On 05.12.2012 20:13, Andres Freund wrote:
> But I really really would like them to go to a per-database directory
> not a per-cluster one. Otherwise the coordination between different
> database "owners" inside a cluster will get really hairy. I want to be
> able to install different versions of an application into different
> databases.
Extension authors should be careful to maintain backwards-compatibility,
so that it would be enough to have the latest version installed. If you
break compatibility, you probably should rename the extension.
That said, I can understand that in practice you'd want to have
different versions installed at the same time, so that you don't need to
re-test everything when upgrading an extension, and don't need to trust
that the extension author didn't accidentally break
backwards-compatibility anyway.
If you really meant "different versions of an application", and not
"different versions of an extension", then it seems to me that you're
abusing the extension infrastructure for something else. If you have
some functions that you consider part of the application, even if those
functions might be useful in other applications too, you probably don't
want to treat them as an extension.
- Heikki