Question about form_tag : Error uninitialized constant Chapter2Controller::User

Hello,   I am trying to pass the argument in form_tag but having some issue. This is what I have

index.rhtml <%= form_tag :action => "process_login"%> User name: <%= text_field "user", "username" %><br> Password: <%= password_field "user", "password" %><br> <%= submit_tag 'Log In' %> <%= end_form_tag %>

Now, how do I see the username and password in controller. this is my process_login looks like

controller.rb def login   @user = User.new   @user.username = params[:username]   end   def process_login   redirect_to :action => 'login', :username => params[:user][:username]   end

I get following error uninitialized constant Chapter2Controller::User

Thank you

have you created a User class?