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# Access number
cat production.log | grep "^Processing" | wc | awk '{print $1}'

# Each IP access number
cat production.log | grep “^Processing” | awk ‘{print $4}’ | uniq -c 

# Independent IP number
cat production.log | grep "^Processing" | awk '{print $4}' | uniq | wc | awk '{print $1}'
cat production.log | grep “^Processing” | awk ‘{print $4}’ | uniq | wc -l 

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# gems
gem 'google-api-client'
gem 'signet'
# Rails.root/config/initializers/google_api_client.rb
require 'google/api_client'
require 'google/api_client/client_secrets'
require 'google/api_client/auth/installed_app'

$google_api_client = Google::APIClient.new(
  :application_name => 'Example for Google API client',

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# References
# http://stackoverflow.com/questions/6115612/how-to-convert-an-entire-mysql-database-characterset-and-collation-to-utf-8
# http://www.a2hosting.com/kb/developer-corner/mysql/convert-mysql-database-utf-8

ALTER DATABASE [DB-NAME] CHARACTER SET utf8 COLLATE utf8_unicode_ci;
ALTER TABLE [TABLE-NAME] CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;

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::-webkit-input-placeholder {
   color: black;
}

:-moz-placeholder { /* Firefox 18- */
   color: black;  
}

::-moz-placeholder {  /* Firefox 19+ */
   color: black;  

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# Refs: http://stackoverflow.com/questions/7527887/validate-image-size-in-carrierwave-uploader

class ImageSizeValidator < ActiveModel::EachValidator
  def validate_each(record, attribute, value)
    unless value.blank?

      image = MiniMagick::Image.open(value.path)
      checks = [
        { :option => :width,
          :field => :width,

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# Only upper case alphabets [A-Z]
value = "";
8.times{value  << (65 + rand(25)).chr} >>}
#or
(0...8).map{65.+(rand(26)).chr}.join
(0...8).map{ ('A'..'Z').to_a[rand(26)]  }.join

# Lower case and upper case [a-zA-Z]
value = "";
8.times{value << ((rand(2)==1?65:97) + rand(25)).chr} >>}

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<!--Normal CSS selector name-->
<div class="here-is-a-css-class-name">
  ....
</div>
<!--Noram JS selector name(CSS selector with prefix 'js-') to To avoid the javascript code was thrown error -->
<div class="js-action-name">
  ....
</div>
<!--Both CSS selector and JS selector work together-->
<div class="style-class-name js-action-name">

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# .powenv
export BYEBUGPORT=3001

# config/initializers/byebug.rb
if Rails.env.development? and ENV['BYEBUGPORT']
  require 'byebug'
  Byebug.start_server 'localhost', ENV['BYEBUGPORT'].to_i
end

# restart Pow process

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# Big thank you to Scott Wheeler and BBG in the Shopify API Forums
# http://ecommerce.shopify.com/c/shopify-apis-and-technology/t/paginate-api-results-113066

module ShopifyAPI
  class Base
    RETRY_AFTER = 60

    def self.find_all(params = {}, &block)
      params[:limit] ||= 50
      params[:page] = 1

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desc "Database related tasks"
namespace :database do
  desc "Convert to utf8mb4"
  task convert_to_utf8mb4: :environment do
    connection = ActiveRecord::Base.connection
    database = connection.current_database

    connection.execute "ALTER DATABASE #{database} CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;"
    puts "Converted #{database} character set"