Ruby on Rails

Trying to upgrade from Ruby 2.0 / Rails 4.0 to Ruby 2.2 / Rails 4.2, I
face a surprising error when logging into my application (based on Rails
Tutorial by M. Hartl):

Controller: SessionsController#create
Instruction: redirect_to root_url
Error message: wrong number of arguments (2 for 1)

Here is the sessions controller:

class SessionsController < ApplicationController

  def new
  end

  def create
    user = User.find_by_login(params[:session][:login])
    if user && user.authenticate(params[:session][:password])
      sign_in user
      redirect_to root_url
    else
      flash.now[:error] = 'Invalid login/password combination'
      render 'new'
    end
  end

  def destroy
    sign_out
    redirect_to root_url
  end

end

Here is the routes file:

ODQStairs::Application.routes.draw do

  resources :requests

#static pages
  get '/help',      to: "static_pages#help"
  get '/about',     to: "static_pages#about"
  get '/contact',   to: "static_pages#contact"

#root definition
  root to: "dashboards#home"

#routes
  resources :sessions, only: [:new, :create, :destroy]
  get '/signin',  to: 'sessions#new'    , via: :get
  match '/signout', to: 'sessions#destroy', via: :delete

  resources :parameters_lists do
      resources :parameters
  end
  ...

I did not find anything in Rails upgrade guides regarding the
redirect_to function. Your help is welcome! Thanks!

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