Hack to add subdocuments to graffiti schema.

graffitiMongoose.js

import {getTypes} from '@risingstack/graffiti-mongoose';
import Models, { User } from '../mongoose';
import Subdocuments from './subdocuments';

let types = getTypes(Models)
let UserType = types.User;

// FIXME: Hack subdocument for now
Object.assign(UserType._typeConfig.fields, {
  bestFriend: Subdocuments.singular(User, UserType),
  friends: Subdocuments.plural(User, UserType),
});

module.exports = types;

subdocuments.js

import ObjectID from 'bson-objectid';
import {
  GraphQLList,
} from 'graphql'

export default {
  plural: (model, type) => {
    return {
      type: new GraphQLList(type),
      resolve: (modelInstance, params, source, fieldASTs) => {
        let ids = modelInstance[fieldASTs.name.value].map(ObjectID);
        return model.find({ _id: { '$in': ids } });
      }
    }
  },

  singular: (model, type) => {
    return {
      type: type,
      resolve: (modelInstance, params, source, fieldASTs) => {
        return model.findOne({
          _id: ObjectID(modelInstance[fieldASTs.name.value])
        })
      }
    }
  }
}