Supporting Rails Nested Resources in Batman.js

model.js.coffee

class App.Model extends Batman.Model

  @persist App.Storage

  @encodeAttributesFor: ->
    @encodeAttributesForKeys ?= []
    for key in arguments
      if typeof key == 'string'
        @encodeAttributesForKeys.splice(index,1) if (index = @encodeAttributesForKeys.indexOf(key)) > 0
        @encodeAttributesForKeys.push key

storage.js.coffee

class App.Storage extends Batman.RailsStorage

  @::before 'create', 'update', (env, next) ->
    if env.subject.constructor.encodeAttributesForKeys?
      data = env.options.data
      if namespace = @recordJsonNamespace(env.subject)
        obj = data[namespace]
      else
        obj = data
      for key in env.subject.constructor.encodeAttributesForKeys
        if obj[key]
          obj["#{key}_attributes"] = obj[key] if obj[key].length
          delete obj[key]
    next()

  @::after 'update', @skipIfError (env, next) ->
    if env.subject and env.subject.constructor.encodeAttributesForKeys?
      for key in env.subject.constructor.encodeAttributesForKeys
        objects = env.subject.get(key)
        if objects?.constructor.name == 'AssociationSet'
          objects.forEach (object) ->
            if object.get('_destroy')
              objects.remove(object) 
            else
              object.get('dirtyKeys').clear()
              object.get('_dirtiedKeys').clear()

store.js.coffee

class App.Store extends App.Model
  
  @hasMany 'products'
  @encodeAttributesFor 'products'

oooh, that's lovely.

If there was a way to work this into the RailsStorage adapter then it seems like an easy merge. Not sure how you'd do that, but that seems like the right spot.

Updated the implementation to use Batman.RailsStorage so that the toJSON method doesn't need to be overwritten.

Added @::after 'update' callback to clean up nested objects after a successful updated.

Any chance of this getting merged into BatmanJS core?