Rails - Jun 2013 - Error if i don't have 'create' method in user_controller and only have 'new' method

I''m trying with chapter 7 in RailsTutorial and have code in
user_controller:



def new
  @user = User.new
end

def create
  @user = User.new(params[:user])
  if @user.save
    redirect_to root_url, :notice => "Signed up!"
  else
    render "new"
  end
end

 if I remove ''create'' method and Running App then have error :

The action ''create'' could not be found for UsersController
I don''t know why have to ''create'' method''?
and how to fix this problem if not using ''create'' method.
Thanks....

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Sorry,I can know about this problem.
I think after click in submit Form and Post action of Form is called and 
in Route :

POST   /users(.:format)             users#create
 this is reason that this app have to do ''create'' method

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