[question] How do I use references in GraphQLType::Context?

[idubrov]

I want to pass multiple references as a context for the query execution.

If I only have one Database struct, then I can make Context = Database and all API is designed in a way that it would accept a reference.

However, what if I have two databases? Context = (Database1, Database2) will not work as I don't have them in one tuple and I cannot move them.

Context = (&Database1, &Database2) doesn't work because of lifetimes, as it seems like there is no way to link lifetime of these references to the lifetime of the request.execute.

I also tried to use trait as a Context (since only a reference is passed around, it should be possible to have support for these), so reference to context becomes trait object (and I can hide stuff in the concrete implementation), but compiler would require that Context is Sized (which I tried to relax by specifying CtxT to be ?Sized everywhere, but it didn't work, don't remember why, though...).

Any advice here?

I also have similar problem with TypeInfo. I have a repository of types and I want to have a reference to it inside each concrete TypeInfo I'm having. As an option, I can build a completely self-sustained TypeInfo's, but I would prefer to have them small and shallow and reference this global type registry for more meta-info for types.

Is there a way to do it better (currently I just use unsafe pointers as a temporary remedy...)?

[miracle2k]

Did you ever find an answer?

[idubrov]

No, not really. I think, we ended up having a single item.

Today I would probably use Arc if needed.

[theduke]

As a late heads up, this is explained in #143 , together with a solution.