       super(attrs, options)
 
       #cheap memoization, requirejs doesn't seem to do it
-      @_base = false 
+      @_base = false
       @properties = {}
       @property_cache = {}
       if not _.has(attrs, @idAttribute)

      if not @_base
        @_base = require('./base')
      return @_base
      
    url: () ->
      # ### method HasProperties::url
      #model where our API processes this model

           @properties[key]['setter']
          @properties[key]['setter'].call(this, val)
          toremove.push(key)
      if not _.isEmpty(toremove)
        attrs = _.clone(attrs)
        for key in toremove
          delete attrs[key]
      if not _.isEmpty(attrs)
        super(attrs, options)

