How to get authenticate to work?

In my SessionController, I tried to authenticate the user but it's failing to authenticate even though I output the information and it's all correct.I'm following this tutorial:

Below is my code:

def create     user = User.find_by(email: params[:email].downcase)     if user && user.authenticate(params[:password])         session[:user_id] = user.id         flash[:notice] = "Welcome back, #{user.name}!"         redirect_to user     else         flash.now[:alert] = "Invalid email/password combination! #{user.name}, #{user.id}, #{params[:password]}"         render :new     end end def destroy     session[:user_id] = nil     redirect_to :new end

The authenticate works fine in rails console but not when the rails server. The problem is with this line user.authenticate(params[:password]) of code.

Any help is much appreciated.

The password is in the session cookie:

if user && user.authenticate(params[:session][:password])