relay support

From this message https://github.com/hasura/graphql-engine/pull/686#issuecomment-428469217

@srghma Thanks for the feedback but Hasura GraphQL engine does not support relay at the moment. we'll revisit when we add relay support.

What’s missing in graphql-engine to support relay?

[0x777]

Hi @srghma @toxsick relay makes assumptions about the GraphQL server as outlined here. We haven’t made any attempt to implement this spec yet. At a quick glance, we don’t have cursors for pagination. Apart from that it shouldn’t be hard to map rest of the spec to what we already have right now.

Is there a timeline to this?

We haven’t received a lot of community interest in this feature. We’ll revisit this once more people ask for this. You can add a +1 reaction to show interest.

[0x777]

Thank you all for taking the time to time to respond how important this feature is for you 😃 This has always been on our radar; we made an exploratory attempt last year too.

Just to give a bit of background, the interface that you see currently with Hasura existed before the first release of GraphQL specification in 2015 (before GraphQL, queries were written in a JSON based DSL called RQL which the console still uses!). Because of this there are some assumptions about the query interface through the codebase. However once we refactor some parts of the codebase as outlined in https://github.com/hasura/graphql-engine/issues/2801, adding an interface like Relay should be fairly straightforward. Our priority currently is to get the 1.0 release out (couple of releases away), and then work on #2801 to implement the Relay interface.