Resolver wrapper should not check for sequential for custom scalar types

[brendanyounger]

I added a custom JSON scalar type to my schema and I cannot return a JSON array because of the check for sequential values here:

lacinia/src/com/walmartlabs/lacinia/schema.clj

Line 414 in d8cb65d

single-result-wrapper (fn [resolved-value next-selector callback]

While this is useful for debugging, it shouldn't be applied to custom scalar types.

[hlship]

We'll need to look into using type information to figure out whether to map the results or just use the single result. Should not be impossible.

[hlship]

So you are returning a value, but it looks like an array to Lacinia, but you have a scalar for the value type such that it can be serialized into the response as is. Right?

This is, to me, an odd edge case.

Could you wrap your JSON value in a wrapper that isn't a sequential, and have your :serializer extract the nested value?

[brendanyounger]

That is correct, I had a scalar JSON type that I was using which was sometimes an array. I wound up wrapping it like you suggested as a work-around. I was just surprised by the error.

It might help to have an example of this in the documentation to clarify when the :serializer functions are run.

[hlship]

I think this is a wont/cant fix.