Saving belongsTo() relationship doesn't work

Version

ember-changeset@^3.0.0-beta.9

Test Case

Profile model:

class Profile extends Model {
  @attr('string') name;
}

User model:

class User extends Model {
  @attr('string') email;
  @belongsTo('profile') profile;
}

Creating a user with a profile and saving it:

const profiles = await this.store.finsAll('profile');
const user = this.store.createRecord('user');
const changeset = new Changeset(user, ...);
changeset.set('email', '[e-mail]');
changeset.set('profile', profile[0]);
changeset.save();

Expected Behavior

User is saved

Actual Behavior

An exception is thrown:

Uncaught (in promise) Error: Assertion Failed: Cannot call set with 'name' on an undefined object.
    at assert (index.js:128)
    at _set2 (index.js:2632)
    at setPath (index.js:2692)
    at Object._set2 [as safeSet] (index.js:2642)
    at merge-deep.js:92
    at Array.forEach (<anonymous>)
    at mergeTargetAndSource (merge-deep.js:81)
    at mergeDeep (merge-deep.js:150)
    at Proxy.execute (index.js:196)
    at Proxy._callee$ (validated-changeset.js:261)

[andreyfel]

@snewcomer I rebased my failing test branch and it still fails. I think I found an issue, will submit a PR tomorrow.

[andreyfel]

Seems it is no longer an issue with the latest build! Thanks a lot @snewcomer!