rails ignoring news redirect_to

i've got unequivocally rudimentary rails doubt here nonetheless i can't seem answer anywhere. i speculation problems bend me following educational rails 1.2 rails 2.1. anyway..

i'm minute blog component i'm implementing comments bit. i have comments displaying glorious once i've combined controlling script/console, nonetheless removing critique form itself operative tough bit.

in posts_controller.rb i have

  def comment
    post.find(params[:id]).comments.create(params[:comment])
    flash[:notice] = "added comment"
    #render :action => show
    redirect_to :action => show
  finish  

and show.html.erb (the view) i have

<%= form_tag :action => "comment", :id => @post %>
  <%= text_area "comment", "body" %><br>
  <%= submit_tag "post comment" %>

when i quarrel form tries urb /posts/comment/1 apparently incorrect, complains can't template. apparently i don't wish template there since i've told route arrangement movement since i wish only re-display post's arrangement page, new critique there.

i've attempted both commented out line (render :action => show) redirect_to line, conjunction seem anything during all.

i'm certain i'm blank something simple, nonetheless it?