The rails way ch2

render, redirect_to, 一個action 裡面只能有一個結果

render, redirect_to 之後的動作也是會繼續做, 這個action的flow跑完, 才會去redirect_to 那的action, 若是不想把flow跑完就得接return

redirect_to :controller => 'main' and return

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prepend_before_filter
skip_filter