undefined method `relative_url_root' error

Hi,

To clear the error ,make the followning change,

changed line no. 51 in asset_packager/lib/synthesis/asset_packager_helper.rb

err line: source = "#{ActionController::Base.asset_host}#{@controller.request.relative_url_root}#{source}"

changed_to :
source = "#{ActionController::Base.asset_host}#{ActionController::Base.relative_url_root}#{source}"

Github get Public Key, set user name

Get Public Key:

ssh-keygen -t rsa

Set Username:

git config --global user.name "srikanth"

git config --global user.email "sri.jjhero@gmail.com"

Multiple Language implementation Using Google Translate

Hi,

Just surfed through how to implement a multiple language App, & got this from google Translate..

Just add this code in your HTML Layout.

<div id="google_translate_element"></div><script>
function googleTranslateElementInit() {
new google.translate.TranslateElement({
pageLanguage: 'en'
}, 'google_translate_element');
}
</script><script src="http://translate.google.com/translate_a/element.js?cb=googleTranslateElementInit"></script>

PTS:
This works only inside the app, & not in a HTML file.

Source : http://translate.google.com/translate_tools?hl=en


Thanks,
Srikanth

Multiple Select boxes in Js

I have gone through many examples for multiple select like this.

& what worked for me is i have given below,

http://www.box.net/shared/9lo1g8p3ei

Download the Js & Css from the above link.

Create a HTML file like this,

<script src="javascripts/moo.js" type="text/javascript"></script>
<script src="javascripts/multi_transfer.js" type="text/javascript"></script>
<link rel="stylesheet" type="text/css" href="stylesheets/multiple.css" />

<table>
<tr>
<td align="center">
<div class="holder" > <p>Exam List</p>
<select multiple="multiple" id="select1" name="select1[]">

<option value="1">one1</option>
<option value="2">one2</option>
<option value="3">one3</option>
<option value="4">one4</option>
<option value="5">one5</option>

</select>
<a href="javascript:;" id="add">add >></a>
</div>
</td>
<td align="center">
<div class="holder"><p>Selected Exam </p>
<select multiple="multiple" id="select2" name="selected_exam_list[]">
</select>
<a href="javascript:;" id="remove"><< remove</a>
</div>
</td>
</tr>
</table>

Reference & Demo : http://davidwalsh.name/dw-content/multi-select.php

Thanks,
Srikanth

Add Favicon in a webpage

This is how we add Favicon in a webpage,

<link rel="SHORTCUT ICON" href="/images/favicon.ico" type="image/x-icon"></span>

Thanks,
Srikanth

Adding GEM sources

sudo gem sources -a http://gems.github.com/

sudo gem sources -a http://gems.rubyonrails.org/

Action Web Service Gem

hi i am using 'actionwebservice' for passing SOAP requests.

Version 2.3.2 for actionwebservice is " datanoise-actionwebservice"

For installing the gem when i used,

gem install datanoise-actionwebservice

got this error,
ERROR: could not find gem datanoise-actionwebservice locally or in a repository

& found this is the right way to install

gem install datanoise-actionwebservice --source http://gems.github.com

Add this line to your config/environment.rb file in the initializer section:

config.gem 'datanoise-actionwebservice', :lib => 'actionwebservice'

Generating API controller

ActionWebService gem includes web_service generator that you can use like this:

$ ./script/generate web_service post

Define your API

Open app/services/post_api.rb file and add methods that your service exposes:

class PostApi < returns =""> [[:string]]
end




API implementation

We are going to use direct dispatching mode, so all methods that implement our API go directly to PostController itself:

class PostController < ApplicationController wsdl_service_name 'Post' web_service_api PostApi web_service_scaffold :invocation if Rails.env == 'development' def get_posts ["Post 1", "Post 2"] end end wsdl url:

http://localhost:3000/post/wsdl

Books : Restful Web Services | Web Services Essentials (O'Reilly XML) | Web Services: Principles and Technology | RESTful Web Services Cookbook

Getting Next Existing Record in a DB

Wondered how to do it,, & did it Using offset:

sql:

SELECT * FROM foo WHERE id = 4 OFFSET 1

Table Sorting Jquery Plugin

Hi,

I was wondering how to sort a table. I got this plugin & did it in 10 mins.

Here is an useful plugin in jquery,

Reference URL : http://tablesorter.com/docs/#Download

Table sorting is pretty much easier using this tablesorter plugin.

Thanks,
Srikanth

MySQL Change root Password

Source : http://www.cyberciti.biz/faq/mysql-change-root-password/

mysqladmin command to change root password

If you have never set a root password for MySQL, the server does not require a password at all for connecting as root. To setup root password for first time, use mysqladmin command at shell prompt as follows:

$ mysqladmin -u root password NEWPASSWORD

However, if you want to change (or update) a root password, then you need to use following command

$ mysqladmin -u root -p'oldpassword' password newpass

For example, If old password is abc, and set new password to 123456, enter:

$ mysqladmin -u root -p'abc' password '123456'

Change MySQL password for other user

To change a normal user password you need to type (let us assume you would like to change password for vivek):

$ mysqladmin -u vivek -p oldpassword password newpass

Changing MySQL root user password using MySQL sql command

This is another method. MySQL stores username and passwords in user table inside MySQL database. You can directly update password using the following method to update or change password for user vivek:

1) Login to mysql server, type following command at shell prompt:

$ mysql -u root -p

2) Use mysql database (type command at mysql> prompt):

mysql> use mysql;

3) Change password for user vivek:

mysql> update user set password=PASSWORD("NEWPASSWORD") where User='vivek';

4) Reload privileges:

mysql> flush privileges;
mysql> quit



Recover Mysql Password

http://www.cyberciti.biz/tips/recover-mysql-root-password.html

Thanks,
Srikanth

Polymorphic Association

Reference : http://charlesmaxwood.com/ruby-on-rails-restful-links-when-you-dont-know-the-class/

Example :

restful routes:

map.resources :users
map.resources :groups

Model Relation:

class Post < ActiveRecord::Base
 belongs_to :owner, :polymorphic => true
end

class User < ActiveRecord::Base
 has_many :posts, :as => :owner
end

class Group
 has_many :posts, :as => :owner
end

Now, let’s say that when you show a post, you want to provide a link to the owner of the post when you display it on its show page. You know that because you’ve provided the restful routes in your config/routes.rb file as show above, you get the nice functionality of the user_path and the group_path methods. The problem is that because you don’t know if @post.owner is a user or a group.

<%= link_to @post.owner.name, polymorphic_path(@post.owner) %>

Documentation : http://railsbrain.com/api/rails-2.3.2/doc/index.html?a=M000261&name=polymorphic_path

Thanks,

Srikanth

string conversions

>>> print "Before %s After" % 7
Before 7 After

>>> print "Before %x After" % 15
Before f After

>>> print "Foo %04d Bar" % 3*3
Foo 0009 Bar

text area tag in rails

<%= text_area_tag(:message, nil, :size => "44x6") %>

jquery show, hide

http://docs.jquery.com/Downloading_jQuery#Current_Release

current version of jquery can be downloaded here.

base 64 enocde/decode

require 'base64'
puts Base64.decode64("aG1hYw==").chomp => hmac
puts Base64.encode64("hmac").chomp => aG1hYw==

Check Whether a test Credit Card is working.,

require 'rubygems'
require 'active_merchant'

# Use the TrustCommerce test servers
ActiveMerchant::Billing::Base.mode = :test

# ActiveMerchant accepts all amounts as Integer values in cents
# $10.00
amount = 1000

# The card verification value is also known as CVV2, CVC2, or CID
credit_card = ActiveMerchant::Billing::CreditCard.new(
:first_name => 'Bob',
:last_name => 'Bobsen',
:number => '349298720353895',
:month => '8',
:year => '2012',
:verification_value => '1234'
)

puts credit_card.valid?

Getting Local ip Address

require 'socket'
def local_ip
orig, Socket.do_not_reverse_lookup = Socket.do_not_reverse_lookup, true # turn off reverse DNS resolution temporarily

UDPSocket.open do |s|
s.connect '64.233.187.99', 1
s.addr.last

end
ensure
Socket.do_not_reverse_lookup = orig
end
p= local_ip
puts p

Get month names for the integer

>> Date::MONTHNAMES[1]
=> "January"

some other date methods:
Date::ABBR_DAYNAMES
Date::ABBR_MONTHNAMES
Date::DAYNAMES


Thanks,
sri..

Adding data in add column

 
Adding data in add column

 class AddPeopleSalary < ActiveRecord::Migration
   def self.up
     add_column :people, :salary, :integer
     Person.reset_column_information
     Person.find(:all).each do |p|
       p.update_attribute :salary, SalaryCalculator.compute(p)
     end
   end
 end

Amazon simple Payment in ruby on rails

hi,
Amazon is Doing a great job in rails Payments.
here is the ruby code for generation of button.

require 'base64'
require 'openssl'
module PayNowWidgetUtils
def generate_signed_form(access_key, aws_secret_key, form_params)
form_params['accessKey'] = access_key
str_to_sign = ""
form_params.keys.sort.each { |k| str_to_sign += "#{k}#{form_params[k]}" }
digest = OpenSSL::Digest::Digest.new('sha1')
hmac = OpenSSL::HMAC.digest(digest, aws_secret_key, str_to_sign)
form_params['signature'] = Base64.encode64(hmac).chomp
signed_form =<<-STARTFORM

STARTFORM

form_params.each do |key, value|
next unless key and value
signed_form +=<<-"FORMELEM"
FORMELEM
end

signed_form +=<<-ENDFORM

ENDFORM

return signed_form
end
end

include PayNowWidgetUtils
ACCESS_KEY = 'your amazon aws access key'
SECRET_KEY = 'your amazon aws secret key'
print generate_signed_form(ACCESS_KEY, SECRET_KEY,
'amount' => 'USD 100',
'description' => 'Test Button',
'referenceId' => 'txn1102',
'returnUrl' => 'http://localhost:3000/success',
'abandonUrl' => 'http://localhost:3000/fail')


amazon aws signup..
http://aws.amazon.com/

use a sandbox account for doing test case.

Get the list of sundays in a month

require 'date'

class Date
def self.last_day_of_the_month yyyy, mm
d = new yyyy, mm
d += 42 # warp into the next month
new(d.year, d.month) - 1 # back off one day from first of that month
end

def self.print_sundays(d1, d2)
d1 +=1 while (d1.wday != 0)
d1.step(d2, 7) do |date|
puts "#{Date::MONTHNAMES[date.mon]} #{date.day}"
end
end
end

date = Date.today
month = date.strftime("%m").to_i
year = date.strftime("%Y").to_i

last_date = Date.last_day_of_the_month(year, month)
l_date = last_date.strftime("%d").to_i
Date.print_sundays(Date::civil(year, month, 1), Date::civil(year, month, l_date))

Jump to the top of a page

Jump to the top of a page

http://www.dynamicdrive.com/dynamicindex5/jumptop.htm

this will help in making a top link in each page.

Connecting Db in ruby

MYSQL_HOST, MYSQL_USER, MYSQL_PASS, MYSQL_DB_NAME = 'localhost', 'root', '', 'artiklz_development'
@@dbh = Mysql.real_connect(MYSQL_HOST, MYSQL_USER, MYSQL_PASS, MYSQL_DB_NAME)

check whether an url is working or not..

1. For domains: ping "domain name"

2. For urls, use the following..

def check_valid_link(link_url)
retrycount = 0
begin
res = Net::HTTP.get_response(URI.parse(link_url))
if res.code =~ /2|3\d{2}/
return true
else
return false
end
rescue Timeout::Error
if retrycount < 4
retrycount += 1
sleep 3
retry
else
return false
end
rescue
return false
end
end

image science requirement

.ruby_inline/Inline_ImageScience_aa58.c:2:23: error: FreeImage.h: No such file or directory

getting such an error??
just install freeimage,


http://www.urbanpuddle.com/articles/2008/01/22/install-freeimage-imagescience-on-ubuntu-gutsy#comments

the above link will guide u in installing..
thanks,

E- Books..

hi,
I have more than 200 E-Books, in all Programming languages.
If any one need it, mail me in sri.jjhero@gmail.com

calling JS from form in rails

<%= form_tag({:action=>"report"},{:method => :post, :onSubmit => "return isNumeric(document.getElementById('premium_user'))"})%>

CSV

hi,
any work under csv??
here s something interesting which makes ur csv work easier.

http://fastercsv.rubyforge.org/

Thanks.

concat multiple arrays

hi,
joining multiple arrays is easy using "+"

we can do that using a single method as follows,

class Array
  def concat_multi *lists
    lists.each {|list| self.concat(list) }
  end
end

a = [1, 2, 3]
b = [4, 5, 6]
c = [7, 8, 9]
d = [10, 11]

a.concat_multi(b, c, d)
p a

Convert a String into Time

require'rubygems'
=> true
require'time'
=> true

a="Thu Feb 19 18:16:33 +0530 2009"
=> "Thu Feb 19 18:16:33 +0530 2009"
a=Time.parse(a)
=> Thu Feb 19 18:16:33 +0530 2009

a.day
=> 19
a.year
=> 2009
a.month
=> 2
a.hour
=> 18
a.min
=> 16
a.sec
=> 33


thanks..

Weekday or not

hi,
wanna find whether a day is week day or not??

i have tried tht here. ,


date=date.today

[0,6].include?(date.wday)

------------------------------------------------------------------------

  require 'date'

class Date
  def weekend?
    self.wday == 0 || self.wday == 6
  end
end

d1 = "9 December 2008"
d2 = "13 December 2008"

p Date.parse(d1).weekend? # false
p Date.parse(d2).weekend? # true

------------------------------------------------------------------------

I have used the code for calculation of weekdays between 2 dates.,

require 'date'
d1 = Date.new( 2008, 11, 1 )
d2 = Date.new( 2008, 12, 31 )

WEEKDAY_NUMBERS = [1,2,3,4,5]
weekdays = (d1..d2).select{ |d| WEEKDAY_NUMBERS.include?( d.wday ) }
p weekdays.length

----------------------------------------------------

Displaying Rss in rails

hi,
i have displayed an array as rss feeds, using rails..

here s the code..
In the controller,

h={}
h[:summary] =summary
h[:description]=description
h[:dtstart]=dtstart.to_s
h[:url]=url
@arr << h

render :layout =>false
response.headers["Content-Type"]= "application/xml; charset=utf-8"

In the View file., Filename is , *.rxml

xml.instruct!
xml.rss "version" => "2.0", "xmlns:dc" => "http://purl.org/dc/elements/1.1/" do
xml.channel do |feed|
feed.title("My great blog!")
feed.description("description")
feed.link("ur url link")

@arr.each { |p|
feed.item do |item|
item.title p[:summary]
item.description p[:description]
item.link p[:url]
item.pubdate p[:dtstart]
end
}
end
end

now it is displayed as xml feed in the view file..
Thanks .

ICAL - specifications

hi,
here is the ical specifications listed by wiki..

http://upload.wikimedia.org/wikipedia/en/c/c0/ICalendarSpecification.png

Thanks.

ICAL-RSS convertion using vpim gem

hi,
i have done the same rss to ical ,vise-versa using vpim gem..

here is the gem home..
http://vpim.rubyforge.org/

This is my code..
require 'rubygems'
require 'vpim/icalendar'
require'feed_tools'
require'digest/md5'

feed = FeedTools::Feed.open("http://rss.cnn.com/rss/edition_world.rss")
cal = Vpim::Icalendar.create2
feed.items.each do |item|
cal.add_event do |e|
e.dtstart item.time
e.dtend item.time
e.summary item.title.to_s
e.description item.description.to_s
e.url item.link
e.uid Digest::MD5.hexdigest("#{item.title} #{item.link}")
e.access_class "PUBLIC"
e.transparency 'OPAQUE'
now = Time.now
e.created now
e.lastmod now
e.organizer do |o|
o.cn = "Example Organizer, Mr."
o.uri = "mailto:organizer@example.com"
end
end
end
icsfile = cal.encode
f=File.open('2.ics','w')
f.write(icsfile)
puts '--- Encode:'

puts icsfile

puts '--- Decode:'

cal = Vpim::Icalendar.decode(icsfile).first

cal.components do |e|
puts e.summary
puts e.description
puts e.dtstart.to_s
puts e.dtend.to_s
puts e.url
end

Ical to Rss Converter

hi,
first execute the rss to ical converter, store it in a file, then use this script, to convert it into rss.

require 'rubygems'
require 'net/http'
require 'uri'
require 'time'

class Time
def self.gcalschema(tzid) # We may not be handling Time Zones in the best way...
tzid =~ /(\d\d\d\d)(\d\d)(\d\d)T(\d\d)(\d\d)(\d\d)Z/ ? # yyyymmddThhmmss
Time.xmlschema("#{$1}-#{$2}-#{$3}T#{$4}:#{$5}:#{$6}") :
nil
end
end


class ICal

attr_accessor :hash, :raw
def initialize(ical_data)
self.raw = ical_data
self.hash = self.parse_ical_data(self.raw)
end

def parse_ical_data(data)
data.gsub!(/\\\n/, "\\n")
data.gsub!(/[\n\r]+ /, "\\n")
lines = data.split(/[\n\r]+/)
structure = [{}]
keys_path = []
last_is_array = false
lines.each do |line|
line.gsub!(/\\n/, "\n")
pair = line.split(':')
name = pair.shift
value = pair.join(':')
case name
when 'BEGIN' #Begin Section
if structure[-1].has_key?(value)
if structure[-1][value].is_a?(Array)
structure[-1][value].push({})
last_is_array = true
else
structure[-1][value] = [structure[-1][value], {}]
last_is_array = true
end
else
structure[-1][value] = {}
end
keys_path.push(value)
structure.push({})
when 'END' #End Section
if last_is_array
structure[-2][keys_path.pop][-1] = structure.pop
last_is_array = false
else
structure[-2][keys_path.pop] = structure.pop
end
else #Within last Section
structure[-1][name] = value
end
end
structure[0]
end
end

class Parse
attr_accessor :url, :ical, :xml, :product_id, :version, :scale, :method, :time_zone_name, :time_zone_offset, :events
def parse_from_ical
rawdata = self.calendar_raw_data
return nil unless rawdata
self.ical = ICal.new(rawdata)
self.version = self.ical.hash['VCALENDAR']['VERSION']
self.scale = self.ical.hash['VCALENDAR']['CALSCALE']
self.method = self.ical.hash['VCALENDAR']['METHOD']
self.product_id = self.ical.hash['VCALENDAR']['PRODID']
self.ical.hash['VCALENDAR']['VEVENT'] = [self.ical.hash['VCALENDAR']['VEVENT']] unless self.ical.hash['VCALENDAR']['VEVENT'].is_a?(Array)
self.ical.hash['VCALENDAR']['VEVENT'].each do |e|
if !e.nil?
st = e['DTSTART']
et = e['DTEND']
#et = (Time.gcalschema("#{e["DTEND;TZID=#{self.time_zone_name}"] || "#{e['DTEND;VALUE=DATE']}T000000"}Z") || Time.gcalschema(e['DTEND'])) + tzadjust
# DTSTART;TZID=America/New_York:20070508T070000
@xtr=self.add_event(Event.new(
:start_time => st,
:end_time => et,
:location => e['LOCATION'],
:created_at => Time.gcalschema(e['CREATED']),
:updated_at => Time.gcalschema(e['LAST-MODIFIED']),
:summary => e['SUMMARY'],
:description => e['DESCRIPTION'],
:recurrance_rule => e['RRULE']
), false) # (disable sorting until done)
@events.reject! {|e| e.start_time.nil?}
@events.sort! {|a,b| a.start_time <=> b.start_time }
puts @xtr
end
end
end

def calendar_raw_data
f=File.open("rss2ical.ics","r")
a=f.readlines
return a.to_s
end

def add_event(event, sortit=true)
self.events = [] unless self.events.is_a?(Array)
self.events << event
@events.sort! {|a,b| a.start_time <=> b.start_time } if sortit
event
end
end

class Event
attr_accessor :start_time, :end_time, :location, :created_at, :updated_at, :summary, :description, :recurrance_rule
def initialize(attributes={})
attributes.each do |key, value|
self.send("#{key.to_s}=", value)
end
end
end

a=Parse.new
a.parse_from_ical

RSS to Ical Converter

hi,
this program gets the rss feed using the feed_tools gem.
then converts into ical. then i ve written it in a file.
hope it will be useful.


require'rubygems'
require'feed_tools'
require'digest/md5'
require 'icalendar'
require 'date'

feed = FeedTools::Feed.open("http://timesofindia.indiatimes.com/rssfeeds/-2128932452.cms")
cal = Icalendar::Calendar.new
cal.custom_property("METHOD","PUBLISH")
feed.items.each do |item|
event = Icalendar::Event.new
event.url=item.link
event.uid=Digest::MD5.hexdigest("#{item.title} #{item.link}")
event.dtstart = item.time.strftime("%Y%m%dT%H%M%S")
event.dtend = item.time.strftime("%Y%m%dT%H%M%S")
event.summary = item.title.to_s
event.description = item.description.to_s
event.klass = "PUBLIC"
cal.add_event(event)
end
ical= cal.to_ical
f=File.open("rss2ical.ics","w")
f.write(ical)

puts ical.to_html

google page rank gem

hi..
Ruby has this gem, to find google page rank of a site......,
just install the gem.

>>> sudo gem install googlepagerank

>>> example program:

require "rubygems"
require "googlepagerank"

puts GooglePageRank.get("www.yahoo.com")
=> 9

u can check the above in the site, for further info.
http://googlepagerank.rubyforge.org/
thanks..