Exception thrown if a field resolver returns anything but a IObj about lacinia

[hlship]

We might need to look into changing the internal representation of a resolved value; today it is a map or seq of maps. We need a way to provide the value and its type tag when, as in your case, it doesn't support metadata. I would suggest a specialized record type with slots for the raw value and the type; we could then get away from using metadata for this purpose.

In terms of manifold and etc., we have informally discussed adding a schema compile option of a function to decorate resolver functions; this decorator could be responsible for converting a manifold deferred into a Lacinia ResolverResult ... ah, looking up, just like the middleware you describe.

[stijnopheide]

After giving it some thought, I could walk the schema to update the resolvers with the default-resolver-middleware function. But still, it would be easier if a datomic Entity (or any other Java object) would be a valid response object from a resolver.

[hlship]

See #58 for the part about middleware. I glanced over the Manifold docs, and it looks quite reasonable to add a wrapper to got from Manifold's Deferred to Lacinia's ResolverResult.