rails form post to index

I have a form with

<% form_tag :controller => 'mycon开发者_JAVA百科troller', :action => 'index', :method => 'post' 

But when i submit it... it goes to the mycontroller#create action.

why? am i missing something?

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Go to here: http://guides.rubyonrails.org/routing.html and check this topic: 2 Resource Routing: the Rails Default

You are using the method post that defaults to the action create.