Ember 3.5 BelongsTo Relationships not Resolving

Question

i used to have emberjs 1.13 which i upgraded to 3.5 i got an issue with belongsTo relationships where i cannot access those data in it. my code as below

model

export default DS.Model.extend( {

  title: DS.attr( 'string' ),
  description: DS.attr( 'string' ),
  published: DS.attr( 'boolean' ),
  publishedAt: DS.attr( 'date' ),

  course: DS.belongsTo( 'course' ),
  author: DS.belongsTo( 'profile', { async: true } ),

  viewed: false,
  isNew: true,

}

in controller

this.get('model.published') working 
this.get('model.author.name') not working 

but the same code was working on 1.13 of emberjs

with ember data 1.13

with ember data 3.5

Answer 1

That's a big upgrade from 1.13 straight to 3.5.

A lot has changed. To fully understand what changed and why, I much recommend reading each of the Ember release notes every time you upgrade a minor or major version. Super helpful.

Most likely author was not loaded into the store. Check your route's model() , network request and Ember Inspector if data loaded in.

If loaded in, it may be the async: true . Try remove it?

This is a working example in Ember 3.5:

app/models/thing.js :

import Model from 'ember-data/model';
import attr from 'ember-data/attr';
import { belongsTo } from 'ember-data/relationships';

export default Model.extend({

  // Attributes
  title: attr('string'),
  description: attr('string'),
  published: attr('string'),
  publishedAt: attr('string'),

  // Relationships:
  // No need for async: true
  course: belongsTo('course'),
  author: belongsTo('author')

});

app/models/author.js :

import Model from 'ember-data/model';
import attr from 'ember-data/attr';

export default Model.extend({
  name: attr('string')
});

app/route/thing.js

import Route from '@ember/routing/route';

export default Route.extend({
  model(params) {
    // Assuming you use JSON API
    // Make sure `author` is included when fetching `thing`
    return this.store.query('thing', {
      include: 'author, course'
    }),
  }
});

app/controllers/thing.js

import Controller from '@ember/controller';

export default Controller.extend({
  init(){
    console.log(this.model.author.name)
  }
});