Scalar type which returns vector about lacinia HOT 4 CLOSED

A bit of a me too, but I find the single value check questionable for any field, not just scalars, and had it get in the way before when I was trying to have the parent object take the form of a Datomic lookup ref like [:user/id "mszajna"].

I suppose the reason we need this check is that Clojure is really permissive and (= (get [] :field) nil) instead of exception. This is particularly annoying for default resolvers (everything just silently nils out), but in this particular case the check could be moved to the default resolver itself. In case of user-defined resolvers it should be easy enough for the developer to spot the problem imho.

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If this is a common problem, then it may be possible to defeat those checks with a schema compilation flag. It does mean that other programming errors will become harder to track down, but I think the problem of resolvers returning incorrect arity (single value vs. seq of values) is a minor one.

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I'm going to think about this for a bit first.

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The :disable-checks? schema compile option can be enabled (it is false by default); it removes the check that ensures that a single value is returned from a resolver that is not a list type.

This option was introduced for performance reasons, but should work well in your case, where a scalar type is, in fact, a seq or set. Of course, you'll need to provide :parse and :serialize for your scalar type that understands what to do.

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