Batman.js: Related model undefined for polymorphic association not found. Same namespace

Question

I am trying to set up the polymorphic association in Batman as documented here. I am using LocalStorage and keep getting the following message:

Related model undefined for polymorphic association not found.

My model is a follows:

class App1.Model extends Batman.Model
  @persist Batman.LocalStorage

class App1.Superpower extends App1.Model
  @resourceName: 'superpower'
  @encode 'id', 'name'
  @belongsTo 'superpowerable', polymorphic: true

class App1.Hero extends App1.Model
  @resourceName: 'hero'
  @encode 'id', 'name'
  @hasMany 'superpowers', as: 'superpowerable', polymorphic: true

class App1.Villain extends App1.Model
  @resourceName: 'villain'
  @encode 'id', 'name'
  @hasMany 'superpowers', as: 'superpowerable', polymorphic: true

and the code I use to instantiate all:

superman = new App1.Hero(name: "Superman")
superman.save()
super_strength = new App1.Superpower(name: "Super Strength")
super_strength.save()   # -> gives "Related model undefined for polymorphic association not found."
invincibility = new App1.Superpower(name: "Invincibility")
invincibility.save()    # -> gives "Related model undefined for polymorphic association not found."

superman.get('superpowers').add super_strength
superman.get('superpowers').add invincibility
superman.save()
super_strength.save()
invincibility.save()

console.log superman.toJSON()
console.log super_strength.toJSON()
console.log invincibility.toJSON()

According to this question it depends on the namespace, but they are all the same in my code, so I'm really wondering what is going wrong here.

Thanks in advance

Answer 1

Uh oh... I wrote that example so if it doesn't work, I'm to blame :)

Just to be sure, did you call App1.run() at the beginning of that script? I ran into that issue while testing last week -- gotta call run to load associations!

Edit:

Oh, it looks like a matter of using the API just right. You have to be explicit with the #{label}_type and #{label}_id of the related models. Batman.js will load the associations from JSON just fine, but you'll have to specify them when initializing a new record, for example:

super_strength = new App1.Superpower
  name: "Super Strength"
  superpowerable_id: superman.get('id'),
  superpowerable_type: 'Hero'

I put up a JSFiddle where it's working: http://jsfiddle.net/2atLZ/2/

I'll go back to the docs and add a note about this! Long term, would be great if the API just accepted #{label} then extracted #{label}_id and #{label}_type... but for now, it's not so.!