JSON API v1.0 support

Hi.

I'm planning to use JSON API v1.0 standard with Grape API + Grape Entities + Grape Swagger in my project, but unfortunately I couldn't manage to make it work.

I've stumbled upon an issue that I cannot create nested attributes. The result I'm trying to achieve should look like so:

{
  "links": {
    "self": "http://example.com/posts",
    "next": "http://example.com/posts?page[offset]=2",
    "last": "http://example.com/posts?page[offset]=10"
  },
  "data": {
    "type": "posts",
    "id": "1",
    "attributes": {
      "title": "JSON API paints my bikeshed!"
    }
    relationships: {
      author: {
        data: {
          id: 1,
          type: 'users'
        }
      }
    }
  }
}

Is it even possible with Grape::Entity + Grape Swagger?

Forgot to mention, Swagger UI just shows flat list of attributes in both request parameters section and response model.

The simplified example of the PostEntity would look like:

class PostEntity < Grape::Entity
  expose :links, documentation: { required: true, type: Hash, desc: '' } do
    expose :self, documentation: { required: true, type: 'url', example: 'example.com', desc: ''}
    expose :next, documentation: { required: true, type: 'url', example: 'example.com', desc: ''}
  end

  expose :data, documentation: { required: true, type: Hash, desc: '' } do
    expose :id, documentation: { required: true, type: String, example: '1', desc: ''}
    expose :type, documentation: {}

    expose: attributes, documentation: {} do
      expose :title, documentation: {}
    end

    expose :relationships, documentation: {} do
      expose :author, documentation: {} do
        expose :data, documentation: {} do
          expose :id, documentation: {}
        end
      end
    end
  end
end