email = “foo@example.com” #test with valid email
split_email = email.split(“@”) #split string with “@”
domain = split_email[1].to_s #get domain name

if email =~ (/\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i)
#checking domain name
Resolv::DNS.open do |dns|
@staus = dns.getresources(domain, Resolv::DNS::Resource::IN::MX)
end
else
errors_add(:email, ‘domain name can not be found.’)
end

Thanks …. Feedback and suggestion are welcome..

put this …

before filter :make_session_clear

def make_session_clear
rollback = session.data.clone
reset_session
rollback.each { |k, v| session[k] = v unless k.is_a?(String) && k =~ /^as:/ }
end

That’s it you are up and running…..

add this code in app/helpers/application_helper.rb

def tooltip(content, options = {}, html_options = {}, *parameters_for_method_reference)
html_options[:title] = options[:tooltip]
html_options[:class] = html_options[:class] || ‘tooltip’
content_tag(“span”, content, html_options)
end

2nd Step

add code in app/views/foo/page.rhtml

3rd Step

add stylesheet in public/stylesheets/yourstyle.css

http://rafael.adm.br/p/simple-tooltip-helper-for-ruby-on-rails/

You need to make changes only in two files.
1>app/controllers/*.rb (eg. account.rb)
2>app/views/your directory/*.rhtml (eg. login.rhtml)

before_filter :loginformcookies

def loginformcookies
if !cookies[:remember_me_id].blank? && !User.count.zero?
if ( User.find(cookies[:remember_me_id]) and Digest::SHA1.hexdigest(User.find(cookies[:remember_me_id]).email)[4,18] == cookies[:remember_me_code])
params[:username]=User.find(cookies[:remember_me_id].to_i).login
params[:test]=cookies[:remember_me_pass]
end
end
end

def login
case request.method
when :post
if  session[:user] = User.authenticate(params[:user_login], params[:user_password])
if params[:rememberme]
userId = session[:user][:id].to_s
cookies[:remember_me_id] = { :value => userId, :expires => 30.days.from_now }
userCode = Digest::SHA1.hexdigest(session[:user][:email])[4,18]
cookies[:remember_me_pass] = {:value =>params[:user_password],  :expires => 10.days.from_now}
cookies[:remember_me_code] = {:value =>userCode, :expires => 10.days.from_now}
else
cookies.delete :remember_me_pass
cookies.delete :remember_me_code
cookies.delete :remember_me_id
end
flash[:notice]  = “Login successful”
cookies[:is_admin] = “yes”
redirect_back_or_default :controller => “admin/general”, :action => “index”
else
flash.now['notice']  = “Login unsuccessful”

@login = params[:user_login]
end
end
end

In view file just pass that variable which you are getting in filter (loginformcookies).

and have fun.

1) Create rails application

rails app_auto_complete

2) Configure your database and set any table say ‘products’.

Assumes that you have products table and name, detail fields are there in table.

3) For quick go scaffold application with

ruby script/generate scaffold Product name:string detail:text

4) Now you have running application , to start application start application

ruby script/server

5) Now install rails plugin from git repo  git://github.com/rails/auto_complete.git
if you have git install please start and get with

git clone git://github.com/rails/auto_complete.git
Put it in ~/vendor/plugins

else download manually  from repo.

6) Ok, now we have plugin for auto complete , check if you have included default javascripts in layout
if not please add in layout.

<%= javascript_include_tag :defaults %>

7) Now open file where you want to put auto complete functionality.Say if in ~app/views/product/new.rhtml

replace line <%= f.text_field :name %>
with <%= text_field_with_auto_complete ‘product’, ‘name’,{}, :skip_style => false  %>

Now open products controller and put this line after

class ProductsController < ApplicationController

skip_before_filter :verify_authenticity_token, nly => [:auto_complete_for_product_name]

9) Now create method for auto complete

def auto_complete_for_message_to()
@products = Product.find(:all , :conditions = >["name like (?)","%"+params[:product][:name].to_s+”%”])
render :partial => ‘product’
end

10) Step for showing auto compete result.
Create partial file in product folder and name it “_product.rhtml”

and put this code

<ul>
<% for product in @products do %>
<li>
<div><%=h product.name %></div>
</li>
<% end %>
</ul>

11) Finally restart you application and go to url

http://host:port/products/new (For local development)

Have fun !!!!!

For any query please post …..

1) First get Git and install it.

2) If Git has not set PATH , press window+break and in advance tab set path “C:\Program Files\Git\bin”

3) Restart you system

4) Now install gem Heroku

gem install heroku

5) Make application with rails “appplication”

6) Initialize git repo.

git init

7) Now, Create your application on Heroku

heroku create

This will ask you for heroku credentil email and password once you have given correct will save in heroku
credentil file. /heroku/credentil

If you have already created application on heroku please skip this step.
Now it’s time to push you application to Heroku

git push heroku master

9) Now Database on Heroku

heroku rake db:migrate

Hey , your creation is on ^

In case if you need to set your rsa key just type ssh-keygen -t rsa -C “email_address” it will generate rsa key for heroku.You can find in current user ~/.ssh folder.

Have fun !!!!!