Rails - Mar 2011 - Authenticity Token!!!!!!!!!

#Answer_controller
  def index
 Hi!
I have next problem.. Please help me understand how token works?? I
need create each form for each user.. i mean, one user can see my form
only once! (unique session)...


   @answers=Hash.new
    if request.post?
    	questions = Question.find(:all,:conditions=>"enabled=1")
	questions.each do |question|
            if params["answer_"+question.id.to_s]
		 @answers[question.id]=params["answer_"+question.id.to_s]
	    	 if !
Answer.create(:question_id=>question.id,:text=>params["answer_"+question.id.to_s])
			flash[:error]="Can`t create answer!"
		 end
            end
	end
	if !flash[:error]
      		redirect_to :action=>"pass"
 	        return false
	end
     end

     @questions = Question.find(:all,:conditions=>"enabled=1")

  end

#view answer.html.erb
<center>

<h1>Survey SIMPLE</h1>

<% form_tag do %>
<table>
	<% @questions.each do |question| %>
	<tr style="vertical-align:top; text-align:left">
		<th><%= question.text %></th>
		<td><%= text_area_tag
"answer_#{question.id}",@answers[question.id],
:cols=>"100", :rows=>"3"
%></td>
	</tr>
	<% end %>
</table>
	<%= submit_tag ''Pass survey'' %>
<% end %>


</center>

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