Error normalising data when morphToMany relationship key doesn't exist

[DennisOng]

Stumbled across this today, seems like there's an issue normalising the data when the relationship key is missing, at least for the morphToMany relationship:

export default class Project extends Model {
  static get entity () {
    return 'projects'
  }

  static fields () {
    return {
      id: this.attr(null),
      name: this.attr(''),
      tags: this.morphToMany(Tag, Taggable, 'tag_id', 'taggable_id', 'taggable_type'),
    }
  }
}

Trying to insertOrUpdate with this project object

{
  'id': 1
  'name' 'Hello'
}

(Notice the tag key is missing in the data)

TypeError: related is undefined vuex-orm.esm.js:6894

[kiaking]

Thanks for the report! I've reproduced it and made a fix at #120. I'll merge this and release the new version soon!

[kiaking]

This is fixed with Vuex ORM 0.23.1!
https://github.com/vuex-orm/vuex-orm/releases/tag/v0.23.1

Thank you for reporting this issue and I hope the new version will help your development ❤️

[DennisOng]

This package is already helping with our development a alot! Thanks for the fix