Filtering out unresolved entities from the list.

[pdambrauskas]

We are spliting our monolith graphql server to federated subgraphs and came across an issue.

when we have a query that returns a list of non-nullable objects, and those objects cannot be resolved - we get an error about unexpected null values.

can you suggest a way to solve this problem without changing graphql schema?

I was thinking of adding a rhai script customization which could somehow handle these cases, but it seems that there is no entry point where I could hook it in.

[pdambrauskas]

We've addressed it with RHAI scripts:

• chenged the type from [Thing!]! to [Thing]!
• on the subgraph side we've add a json path to the list, where the nulls can appear on the response extensions field
• on subgraph_service added that list of paths to request.context
• on supergraph_service filtered null values by the path

Would be nice to have some kind of similar functionality out of the box - it complicates things a lot when you are migrating from some monolith graphql server to the federation.