angularjs - POSTing and PUTing a restangular object -

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i trying create new restangular object, post it, modify , put it.

$scope.new_message = restangular.one('messages');  // should post $scope.new_message.save().then(function(message){     $scope.new_message = message; });  // should put $scope.new_message.subject = "hello world"; $scope.new_message.save()

unfortunately restangular sending put request to http:/localhost/messages/undefined/5481ebbfe252e4116a8334d0

when should be http://10.211.55.3/messages/5481ebbfe252e4116a8334d0

it seems use .one() must include id 1 of parameters. question is, how can leverage .save() functionality without using id


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