How to use set_result with transacion in endpoint (Netzke gem) - netzke

Question

I have create an endpoint for create new Client.
At first I have create Client and use transaction (see code below).
It's work normally.
# Before add set_result
js_method :on_new_contact, <<-JS
function() {
var form = this.items.first().getForm();
if (form.isValid()) {
this.newContact(form.getFieldValues());
this.closeRes = 'create_user';
this.close();
}
}
JS
endpoint :new_contact do |params|
data_hash = params.to_hash
Client.transaction do
new_client = Client.new
data_hash.each do |field, value|
new_client.__send__("#{field}=", value)
end
if new_client.save!
flash :notice => "Client #{new_client.full_name} has been created"
else
flash :error => new_user.errors.full_messages.to_sentence
end # if
end # transaction
{:netzkeFeedback => #flash}
end # endpoint
And after I have add set result for return new Client id from endpoint.
It's save new Client 3 times to my database.
# After add set_result
js_method :on_new_contact, <<-JS
   function() {
     var form = this.items.first().getForm();
     if (form.isValid()) {
       this.newContact(form.getFieldValues(), function(value){
           alert(form);
           alert(value);
       }, this);
       this.closeRes = 'create_user';
       this.close();
     }
   }
 JS
 endpoint :new_contact do |params|
   data_hash = params.to_hash
   Client.transaction do
     new_client = Client.new
     data_hash.each do |field, value|
       new_client.__send__("#{field}=", value)
     end
     if new_client.save!
       flash :notice => "Client #{new_client.full_name} has been created"
     else
       flash :error => new_user.errors.full_messages.to_sentence
     end # if
   end # transaction
   {:netzkeFeedback => #flash, :set_result => new_client.id}
 end # endpoint
I already try to find what the problem.
And I found it happen when I use set_result with transaction.
If I remove transaction OR set_result code, it will work normally.
Then how can I make it work?