Query based on id return null for Interface

[alexluong]

Description

When using Interface, query based on id will return null

Steps to reproduce

Code based on @ChristopherBiscardi 's gatsby-data-experiments

[stefanprobst]

Could you provide a repo to quickly reproduce this? Thanks!!

[ChristopherBiscardi]

https://github.com/ChristopherBiscardi/gatsby-data-experiments/blob/master/gatsby-node.js

[stefanprobst]

Quick question: why did you manually add the parent field to the interface? -- it should be available via ... on Node { parent } because all @nodeInterface implementers also implement the Node interface.
EDIT: We could add all Node interface fields to @nodeInterface interfaces.

[ChristopherBiscardi]

@stefanprobst There's no real reason. I talked about this with @freiksenet and he had the same comment. I should remove it.