Rails: Nested_form_for and scope, POST creates record twice/duplicate

In my form I need my admin scope like this

<%= form_for [:admin, @event], :html => {:multipart => true} do |f| %>

Now, replacing this with nested_form_for (Using Ran Bates' Nested_form gem)

<%= nested_form_for [:admin, @event], 开发者_StackOverflow:html => {:multipart => true} do |f| %>

the POST action inserts the new nested task record for this event twice!?

Removing the :admin scope fixes this, but I could not do without it. What would be a solution here? Thanks!

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Issue originated from messed up controller action. Closing this.