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application_controller.rb

 
class ApplicationController < ActionController::Base
  protect_from_forgery

layout :detect_browser

 
  helper_method :current_user
  helper_method :logged_in?
  helper_method :admin_only!
  helper_method :menu_item
  helper_method :require_user
  helper_method :set_params_page
  helper_method :show_layout?
  helper_method :pjax_request?
  helper_method :title
  helper_method :set_pagination_buttons

  protected

This incredibly useful helper gives us the currently logged in user. We keep track of that by just setting a session variable with their id. If it doesn’t exist, we just want to return nil.

 
  def current_user
    return unless session[:user_id]
    @current_user ||= User.first(:id => session[:user_id])
  end

This very simple method checks if we’ve got a logged in user. That’s pretty easy: just check our current_user.

 
  def logged_in?
    current_user
  end

Our admin_only! helper will only let admin users visit the page. If they’re not an admin, we redirect them to either / or the page that we specified when we called it.

 
  def admin_only!(opts = {:return => "/"})
    redirect_with_sorry(opts) unless logged_in? && current_user.admin?
  end

Similar to admin_only!, require_login! only lets logged in users access a particular page, and redirects them if they’re not.

 
  def require_login!(opts = {:return => "/"})
    redirect_with_sorry(opts) unless logged_in?
  end

  def menu_item(name, url, options = {})
    icon = options.fetch(:icon){ false }
    classes = options.fetch(:classes){ [] }
    rel = options.fetch(:rel){ false }

    classes << name.downcase.gsub(" ", "_")
    classes << (request.path_info == url ? "active" : "")

    "<li class='#{classes.join(" ")}'>
      <a href='#{url}'" + (rel ? " rel='#{rel}'" : "") + ">" +
      (icon ? "<div class='icon'></div>" : "") +
      "#{name}</a>
    </li>"
  end

  def require_user
    redirect_to root_path unless current_user
  end

Many pages on rstatus are paginated. To keep track of it in all the different routes we have this handy helper that either picks up the previous setting or resets it to a default value.

 
  def set_params_page
    params[:page]     = params.fetch("page"){1}.to_i
    params[:per_page] = params.fetch("per_page"){20}.to_i
  end

Similar to the set_params_page helper this one creates the links for the previous and the next page on all routes that display stuff on more than one page. If needed it can also take options for more parameters

 
  def set_pagination_buttons(data, options = {})
    return if data.blank?

    %w[next previous].each do |type|
      if data.send("#{type}_page")
        params = {
          :page     => data.send("#{type}_page"),
          :per_page => data.per_page
        }.merge(options)

        instance_variable_set(:"@#{type}_page", "?#{Rack::Utils.build_query params}")
      end
    end
  end

  def title(str)
    @title = str
    pjax_request? ? @title : nil
  end

  def pjax_request?
    env['HTTP_X_PJAX']
  end

  def show_layout?
    !pjax_request?
  end

private

  MOBILE_BROWSERS = ["android", "ipod", "opera mini", "blackberry", "palm","hiptop","avantgo","plucker", "xiino","blazer","elaine", "windows ce; ppc;", "windows ce; smartphone;","windows ce; iemobile", "up.browser","up.link","mmp","symbian","smartphone", "midp","wap","vodafone","o2","pocket","kindle", "mobile","pda","psp","treo"]

  def detect_browser
    agent = request.headers["HTTP_USER_AGENT"].downcase
    if MOBILE_BROWSERS.find { |m| agent.match(m) }
      'mobile'
    else
      'application'
    end
  end

  def redirect_with_sorry(opts)
    flash[:error] = "Sorry, buddy"
    redirect_to opts[:return]
  end

end