gistfile1.txt

  def plugins=(next_plugin_names)
    next_plugin_names.sort!
    current_plugin_names = self.plugins.collect { |p| p.name }.sort!

    # Nothing changed? Do nothing
    return if current_plugin_names == next_plugin_names

    # Add extra plugins, if there are more assigned, compared to before
    next_plugin_names.each do |new|
      if current_plugin_names.member? new
        current_plugin_names.delete new
      else
        new_position = UserPlugin.select("user_plugins.position").where(:user_id => self).order('user_plugins.position DESC').limit(1).first.position + 1
        self.plugins.create(:name => new, :position => new_position)
      end
    end

    # Remove plugins not referenced
    current_plugin_names.each do |remove|
      UserPlugin.where(:name => remove).where(:user_id => self).destroy_all
    end
  end