     @_store.refresh options
 
   ###
-    changedAttributes - override to treat relations
-  ###
-  changedAttributes: (attr) ->
-    changedAttr = super
-    if attr? and changedAttr
-      _.each changedAttr, (value, key) =>
-        # TODO: Should iterate over hasMany to check if it has changed
-        if @belongsTo[key] or @hasOne[key] or @hasMany[key] or @hasAndBelongsToMany[key]
-          delete changedAttr[key]
-      changedAttr = false if _.isEmpty(changedAttr)
-    return changedAttr
-
-  ###
     setPersistent - change persistent model state
 
     Models marked as persistent are not released from Store upon releaseAll call

      serverModel.trigger('refresh:done', serverModel)
      return serverModel
    else
      # Must check if conflicts
      serverData = storedModel.parse(model)
      syncAttr = storedModel.syncAttributes
      serverChangedAttr = storedModel.syncChangedAttributes(serverData)

  ###
  syncChangedAttributes: (attr) ->
    changed = {}
    parsedAttr = @_parseAttributeModifiers(attr)
    _.each parsedAttr, (value, key) =>
      unless (@belongsTo[key] or @hasMany[key] or @hasAndBelongsToMany[key] or @hasOne[key])
        if _.isArray(@syncAttributes[key]) and _.isArray(value)
          diff = _.difference(@syncAttributes[key], value)
          if diff.length
            changed[key] = attr[key]
        else if value instanceof Date
          unless (@syncAttributes[key] instanceof Date and Date.equals(@syncAttributes[key], value))
            changed[key] = attr[key]
        else if @syncAttributes[key] != value
          changed[key] = attr[key]
      else
        changed[key] = attr[key]
