current_user未存储在生产服务器上的会话中

Question

I'm having a difference between dev and production (on a shared webserver). In my application controller I have these 2 lines as part of a method which stores updates:

@activity.update_attribute(:user_id, current_user.id)
@activity.update_attribute(:company_id, current_user.company.id)

In dev both the user_id and company_id are known and get saved in the database. This is because there is a before filter which stores the session info in the current_user.

But with the exact same code on the shared production server, it gives an error when it stores the record to the database and when I look in the log these both values are NULL. The error is:

"ActiveRecord::StatementInvalid (Mysql2::Error: Column 'company_id' cannot be null: INSERT INTO `activities` (`activity`, `company_id`, `created_at`, `updated_at`, `user_id`) VALUES ('Test', NULL, '2011-12-09 09:01:29', '2011-12-09 09:01:29', NULL)):"

To me it seems on production the session isn't stored properly. I've searching around and the only think I can find is this article, which says you have to add "allow_http_basic_auth" to the user model. When I do that (I'm not using Authlogic by the way), then it returns this error:

undefined method `allow_http_basic_auth' for #<User:0x007f91990efce0>

Any ideas would be great!

Edit: in the application controller I have this:

  helper_method :current_user

  def current_user
        @current_user ||= User.find(session[:user_id]) if session[:user_id]
  end

    # Save new activity/update 
    def store_update(activity)
     @activity = Activity.new
     @activity.update_attribute(:activity, activity)
     @activity.update_attribute(:user_id, current_user.id)
     @activity.update_attribute(:company_id, current_user.company.id)
     @activity.save
    end

Answer 1

The problem was not is the session, the logger showed correct session values just before saving the record. It now works by changing this:

@activity = Activity.new
@activity.update_attribute(:activity, activity)
@activity.update_attribute(:user_id, current_user.id)
@activity.update_attribute(:company_id, current_user.company.id)
@activity.save

To this:

@activity = Activity.new
@activity.update_attributes(:activity => activity, :user_id => current_user.id, :company_id => current_user.company.id)

And I'm not completely sure why...