Is it possible to redirect a page in HAML/Rails?

Question

I have this code that create a link to a page to login to facebook at 'auth/facebook'

index.html.haml

  - if current_user
    = link_to "Sign out", signout_path, id: "sign_out"
  - else
    = link_to "Sign in with Facebook", "/auth/facebook", id: "sign_in"

But if i want if current_user to redirect to '/dashboard' so that when someone is logged in they get redirected from the login page automatically.

sessions controller

class SessionsController < ApplicationController
  def create
    user = User.from_omniauth(env["omniauth.auth"])
    session[:user_id] = user.id
    redirect_to dashboard_url
  end

  def destroy
    session[:user_id] = nil
    redirect_to login_url
  end
end

Answer 1

在SessionsController ，只需检查会话并重定向它是否已经存在，除了尝试注销的情况除外：

before_filter :except => [:destroy] {|c| c.redirect_to dashboard_path if c.current_user }