Lifetime issue when borrowing inside a transaction about diesel_async HOT 4 CLOSED

This is essentially a duplicate of #23

As explained there this is a limitation of the current implementation of async in rustc, which means we cannot do much to improve the situation there as long as there are not substantial improvements on the language/compiler side. As for the error message: Yes that one is not great, but again: It's something that comes from rustc, so please report this in their repository. They care for such bad error messages and that's a quite general case here.

As a workaround: Your callback needs to own all relevant values. Use something like

let user: User = conn
        .transaction(move |conn| Box::pin(async move { users::table.find(user_id).first(conn).await }))
        .await?;

Closed as this is not actionable from our side.

from diesel_async.

Thanks. I did not think to check the GH discussions, only the issues, sorry.

Sadly the workaround is ... not that possible as I'm handed borrowed data directly. I'd need to clone it, which is not ideal at all. Oh well, that's what I'm getting for being on the bleeding edge 😄

from diesel_async.

I'd need to clone it, which is not ideal at all.

I fear cloning stuff is currently the only possible solution. I'm happy to be proven wrong here, but I just do not see any other option to write such an API at all.

from diesel_async.

Yep, in this case I cannot avoid cloning as I'm passed references. In the owned case, the usual lifetime joker that is Arc is a solution though.

from diesel_async.