LDAP authentication always returning true

Im following a tutorial online (http://my.opera.com开发者_开发知识库/learnror/blog/ldap-binding-and-authentication-ror) to setup authentication against an LDAp active directory (have a pretty tough time with it too). Anyway, i got the login form and everything setup but for some reason, no matter what i type into the form, (even wrong/nonexistent credentials), it comes back as true! Can anyone help?

OR can anyone provide away to have some sort of debugger run the code line by line (like done with jaavscript debugger). Heres the code that authenticates the login form: (the LDAP module is in a separate lib file):

def authenticate
if session[:person] = LDAP.authenticate(params[:login][:name], params[:login][:p
assword])
session[:username] = params[:login][:name]

if session[:return_to]
redirect_to(session[:return_to])
session[:return_to] = nil
else
redirect_to :controller => 'login' , :action => 'index'
end
else
flash[:notice] = "Login failed!"
redirect_to :action => "index"
end

It looks to me like you used = instead of == in if session[:person] = LDAP… == means equals, = means assignment.