Archive for the ‘Uncategorized’ Category

Crop center and resize paperclip image attachment

has_attached_file :profile_image,
storage: :s3,
s3_credentials: {
bucket: Settings.s3_bucket_name,
access_key_id: Settings.aws_access_key_id,
secret_access_key: Settings.aws_secret_access_key
default_url: '/assets/default_profile_pic.png',
styles: { square_50: '', square_100: '', square_193: '' },
convert_options: {
square_50: '-gravity center -resize 50x50^ -crop 50x50+0+0',
square_100: '-gravity center -resize 100x100^ -crop 100x100+0+0',
square_193: '-gravity center -resize 193x193^ -crop 193x193+0+0'

Categories: Uncategorized Tags: , , ,

Date Time Format In RUBY

November 27, 2012 1 comment

Format meaning:

%a – The abbreviated weekday name (“Sun”)
%A – The full weekday name (“Sunday”)
%b – The abbreviated month name (“Jan”)
%B – The full month name (“January”)
%c – The preferred local date and time representation
%d – Day of the month (01..31)
%H – Hour of the day, 24-hour clock (00..23)
%I – Hour of the day, 12-hour clock (01..12)
%j – Day of the year (001..366)
%m – Month of the year (01..12)
%M – Minute of the hour (00..59)
%p – Meridian indicator (“AM” or “PM”)
%S – Second of the minute (00..60)
%U – Week number of the current year,
starting with the first Sunday as the first
day of the first week (00..53)
%W – Week number of the current year,
starting with the first Monday as the first
day of the first week (00..53)
%w – Day of the week (Sunday is 0, 0..6)
%x – Preferred representation for the date alone, no time
%X – Preferred representation for the time alone, no date
%y – Year without a century (00..99)
%Y – Year with century
%Z – Time zone name
%% – Literal “%” character

t =
t.strftime(“Printed on %m/%d/%Y”) #=> “Printed on 27/11/2012”
t.strftime(“at %I:%M%p”) #=> “at 11:06AM”

Categories: Uncategorized Tags:

Disable Firewall CentOS / RHEL / RedHat

September 18, 2012 2 comments

First login as the root user.

Next enter the following three commands to disable firewall.
# service iptables save
# service iptables stop
# chkconfig iptables off

If you are using IPv6 firewall, enter:
# service ip6tables save
# service ip6tables stop
# chkconfig ip6tables off

Categories: Uncategorized Tags: ,

Selenium Webdriver with Ruby Unit Example of Google Search

Copy the code and save as google_search.rb and run “ruby google_search.rb”

require “selenium-webdriver”
require “test/unit”
class GoogleSearch < Test::Unit::TestCase
  def setup
    @driver = Selenium::WebDriver.for :firefox
    @base_url = “;
    @driver.manage.timeouts.implicit_wait = 30
    @verification_errors = []
  def teardown
    assert_equal [], @verification_errors
  def test_google_search
    @driver.find_element(:name, “q”).clear
    @driver.find_element(:name, “q”).send_keys “Thiyagarajan Veluchamy”
    @driver.find_element(:name, “btnK”).click
  def element_present?(how, what)
    @driver.find_element(how, what)
  rescue Selenium::WebDriver::Error::NoSuchElementError
  def verify(&blk)
  rescue Test::Unit::AssertionFailedError => ex
    @verification_errors << ex
Categories: Uncategorized Tags:

sendmail settings in rails 3 application

Open “application.rb” file in “config” folder of your application and add the following data to it.


config.action_mailer.delivery_method = :sendmail

config.action_mailer.sendmail_settings = {
:location => ‘/usr/sbin/sendmail’,
:arguments => ‘-i -t’

config.action_mailer.perform_deliveries = true
config.action_mailer.raise_delivery_errors = true


Categories: Uncategorized Tags: ,

Taskbar missing in ubuntu

  1. Press Alt+F2, in text fild type ‘gnome-terminal’ (without quots) and click on ‘Run’.
  2. In terminal submit the commands below one by one. Select one line at a time and press ‘Enter’.

gconftool –recursive-unset /apps/panel
rm -rf ~/.gconf/apps/panel
pkill gnome-panel

Categories: Uncategorized Tags:

Preload site before displaying

We can easiest can do this,

<script language="javascript" type="text/javascript">
function showpage() {
 document.getElementById('loader').style.display = "none"; 
 document.getElementById('main').style.display = "block"; 
<body onload="showpage();">
<div style="height:100%; width:100%; display:block;" id="loader">
Some preloading content here
<div style="height:100%; width:100%; display:none;" id="main">
Main Content Here

Categories: Uncategorized