Cannot match against 'undefined' or 'null in JsonApiView with Relationships about adonis-jsonapi HOT 2 OPEN

return this.hasMany('App/Http/JsonApiViews/Contact', {
  included: true,
  excludeRelation: 'user'
});

const JsonApiView = require('adonis-jsonapi/src/JsonApiView')
class User extends JsonApiView {
  get attributes() {
    return ['first-name', 'last-name', 'email'];
  }
  contacts() {
    return this.hasMany('App/Http/JsonApiViews/Contact', {
      included: true,
      excludeRelation: 'user'
    });
  }
}
module.exports = User

const JsonApiView = require('adonis-jsonapi/src/JsonApiView')
class Contact extends JsonApiView {
  get attributes() {
    return ['first-name', 'last-name', 'email', 'phone'];
  }
  user() {
    return this.belongsTo('App/Http/JsonApiViews/User', {
      included: true,
      excludeRelation: 'contact'
    });
  }
}
module.exports = Contact

* index (request, response) {
    const user = yield User.find(1)
    const contacts = yield user.contacts().fetch()
    response.jsonApi('Contact', contacts)
  }