CP of Object proxies that define a "view-specific" attribute

gistfile1.coffee

wrapWithProperty = (arrayName, propertyName, value) ->
  Ember.computed arrayName + ".[]", ->
    @get(arrayName).map( (each) ->
      eachHash = {}
      eachHash[propertyName] = value
      eachHash.content = each
      Ember.ObjectProxy.create(eachHash)
    )

wrapWithHash = (arrayName, hashName) ->
  Ember.computed arrayName = ".[]", hashName, ->
    hash = @get(hash)
    array = @get(arrayName)
    array.map( (each) ->
      hash.content = each
      Ember.ObjectProxy.create hash
    )

Now with more O(1) inserts!

wrapWithProperty = (arrayName, propertyName) ->
  Ember.computed.map arrayName, (each) ->
    Ember.ObjectProxy.create
      content: each
      propertyName: null