Amitesh

# MyModel Model
class MyModel < ActiveRecord::Base
    
    has_attached_file :my_image,
      :styles => {  :small_thumb    => "50x50",
                    :medium_thumb   => "100x100" 
                 },
      :default_url  => "/images/missing/prints/:style.png"
end

Amitesh

1) Following regex in ruby is throwing server start (compile) time error on Mac Book Pro while on Ubuntu it is working.
    # Clean all new line character
    string.gsub!(/(?<!\n)\n(?!\n)/, '')

   Error :
    undefined (?...) sequence: /(?<!\n)\n(?!\n)/ (SyntaxError)
   
   Solution :
   string.gsub!(/\r/,"")
   string.gsub!(/\n/," ")

Amitesh

XML parsing does not support   entity.   is XHTML entity. If we parse the html or xml or html as xml then you get "Undefined entity" error in firefox error console. To make it working use unicode of   (non-breakibg space character)   or simply put space (" " or  ).

for example :
<div> &nbsp; hello I am going to break. If you are going to use xml parser :( </div>

Corrected as :
<div> &#160; hello I am going to break. If you are going to use xml parser :( </div>

Amitesh

svn checkout https://server.example.com/srv/svn/agaric myworkingcopyfolder
svn status
svn update
svn add yournewfilehere
svn add yournewdirectoryincludingfiles/
svn commit -m "I made changes.  Woohoo." files1 files2

Use 'add' for only new file.

http://www.linuxfromscratch.org/blfs/edguide/chapter03.html#ch03-add

Amitesh

//using  jquery date picker

function getPreviousDay(event){
  event.preventDefault();
  var currDate = $('#date_box').val();
      currDate = $.datepicker.parseDate('mm/dd', currDate);
      
  var d = currDate.getDate();
  var m = currDate.getMonth();
  var y = currDate.getFullYear();

Amitesh

http://mathiasbynens.be/demo/url-regex

Amitesh

Install sphinx for Rails 3
=================================
http://freelancing-god.github.com/ts/en/installing_sphinx.html

1) Download : http://sphinxsearch.com/files/sphinx-0.9.9.tar.gz
2) ./configure  (It will configure with mysql default)
3) make
4) sudo make install
5) goto (cd) rails project directory
6) bundle exec rake ts:index RAILS_ENV=staging

Amitesh

# It works for pure text only. It will fail for html and url type of text.
# http://henrik.nyh.se/2007/03/ruby-wordwrap-method

def wrap_long_string(text,max_width = 20)
  (text.length < max_width) ?
    text :
    text.scan(/.{1,#{max_width}}/).join("<wbr>")
end

Amitesh

#http://blog.wyeworks.com/2009/7/13/paperclip-file-rename

 Paperclip.interpolates :default_image_type do |attachment, style|
    attachment.instance.get_user_default_profile_image
  end
  
  Paperclip.interpolates :normalized_avatar_file_name do |attachment, style|
    attachment.instance.normalized_avatar_file_name
  end
  

Amitesh

require 'rubygems'
require 'zip/zip'

def unzip_file (file, destination)
  Zip::ZipFile.open(file) { |zip_file|
   zip_file.each { |f|
     f_path=File.join(destination, f.name)
     FileUtils.mkdir_p(File.dirname(f_path))
     zip_file.extract(f, f_path) unless File.exist?(f_path)
   }