[JSON-API] Rendering an empty relationship

[lasseebert]

I would like to render empty (nil) relationships with JSONAPI like so:

{
  "relationships": {
    "some_relation": { "data": null }
  }
}

This is what the jsonapi specification says. See http://jsonapi.org/format/#document-resource-object-linkage

When I use render_nil: true in a has_one I get

undefined method `each' for nil:NilClass

It seems like a simple issue to fix inside the JSON::JSONAPI. Can anyone confirm that it's not just me doing something stupid? If so I'll be happy to fix it in a pull request :)

[myabc]

This issue was moved to trailblazer/roar-jsonapi#8