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# /app/models/mongoid/base_model.rb

module Mongoid
  module BaseModel
    extend ActiveSupport::Concern

    included do
      scope :recent, -> { desc(:create_at) }
    end

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class MagicString < String
  def +@
    upcase
  end
 
  def -@
    downcase
  end
 
  def !

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class User
  include Mongoid::Document
  include Mongoid::Timestamps

  def self.added_fans(day_num)

    self.collection.aggregate(
      {
        "$match" => {
          "followable_type" => "User",

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require "active_support"
require "rest_client"

url ="http://media.vimcasts.org/videos/index.json"
result = RestClient.get url

json_obj = ActiveSupport::JSON.decode result

json_obj.each do |json |
  media_url = json.last["quicktime"]["url"]

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module Retriable
  # This will catch any exception and retry twice (three tries total):
  #   with_retries { ... }
  #
  # This will catch any exception and retry four times (five tries total):
  #   with_retries(:limit => 5) { ... }
  #
  # This will catch a specific exception and retry once (two tries total):
  #   with_retries(Some::Error, :limit => 2) { ... }
  #

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// ----
// libsass (v3.2.4)
// ----

//定義方法 animation-delay-n
@mixin animation-delay-seconds($n){
  &:nth-child(#{$n}){
    animation-delay: #{$n*2}s;
  }
}

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module Grape
  module ContentTypes
    def self.content_types_for(from_settings)
      if from_settings.present?
        from_settings
      else
                ActiveSupport::OrderedHash[
                    :xml,  'application/xml',
                    :serializable_hash, 'application/json',
                    :json, 'application/json',

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proxy_set_header X-Real-IP $remote_addr; 

# 然后在Grape 里面用 headers['X-Real-Ip'] 就可以取到 remote ip 了

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class ExampleCrawler < PoltergeistCrawler
  def crawl
    visit "https://news.ycombinator.com/"
    click_on "More"
    page.evaluate_script("window.location = '/'")
  end
end
ExampleCrawler.new.crawl

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require 'open-uri'
require 'nokogiri'
require 'capybara/poltergeist'

url = "http://mp.weixin.qq.com/s?__biz=MzA3NDMyOTcxMQ==&mid=209031164&idx=1&sn=606c865bfbc982029b2b71731304d7bb&3rd=MzA3MDU4NTYzMw==&scene=6#rd"

Capybara.default_driver = :poltergeist
Capybara.run_server = false

doc = Nokogiri::HTML(open(url))