AuthLogic setup issues

I am trying to set up a simple login using AuthLogic into my User table. Every time I try, the login fails and I don't know why. I'm sure this is a simple mistake, but I've been pushing a brick wall on it for a while.

#user_sessions_controller
def create
@user_session = UserSession.new(params[:user_session])
  if @user_session.save
    flash[:notice] = "Login successful!"
  else
    flash[:notice] = "We couldn't log you in. Please try again!"
    redirect_to :controller => "index", :action => "index"
  end
end

#_user_login.html.erb (this is the partial from my index page where Users log in)
<% form_tag user_session_path do %>
  <p><label for="login">Login:</label> 
<%= text_field_tag "login", nil, :class => "inputBox", :id => "login",
  </p>

  <p><label for="password">Password: </label>
<%= password_field_tag "password", nil, :class => "inputBox", :id => "password",
  </p>

  <p><%= submit_tag "submit", :class => "submit" %></p>
<% end %>

      

        
        
        
      

    

I've got Faker generating some data for my users table, but I can't login! Every time I try it just redirects to the index. Where am I going wrong? Thanks everyone.

------ UPDATE ------

I have implemented Jakub Hampl's suggestion with form_for now - I am getting new error.

ActionView::TemplateError (called id for nil, which would mistakenly be 4 -
1: <% form_for @user_session do |f| %>
2: <% if flash[:notice] -%>
3: <p class="notice"><%= flash[:notice] %></p>
4: <% end -%>

app/views/index/_user_login.html.erb:1
app/views/layouts/index.html.erb:65
app/controllers/index_controller.rb:3:in `index'

Rendered rescues/_trace (86.0ms)
Rendered rescues/_request_and_response (1.0ms)
Rendering rescues/layout (internal_server_error)

      

        
        
        
      

    

I haven't changed the controller at all. Thanks to everyone who answers this thread - it's incredibly helpful to me. What can I do to overcome this obstacle?

------ UPDATE # 2 ------

Here is my application controller.

def current_user_session
  return @current_user_session if defined?(@current_user_session)
  @current_user_session = UserSession.find
end

def current_user
  return @current_user if defined?(@current_user)
  @current_user = current_user_session && current_user_session.user
end

def require_user
  unless current_user
store_location
flash[:notice] = "You must be logged in to access this page"
redirect_to login_path
return false
  end
end

def require_no_user
  if current_user
store_location
flash[:notice] = "You must be logged out to access this page"
redirect_to root_url
return false
  end
end

      

        
        
        
      

    

Which one should be changed to @user_session?