Making Will Paginate Ajax + Rails 3

1. Create a helper file : app / helpers / remote_link_pagination_helper.rb

module RemoteLinkPaginationHelper
  class LinkRenderer < WillPaginate::ActionView::LinkRenderer
    def link(text, target, attributes = {})
      attributes['data-remote'] = true
      super
    end
  end
end


2. In the View File where pagination links come, add this line. (@people is the array to paginate)

will_paginate @people, :renderer => 'RemoteLinkPaginationHelper::LinkRenderer'



Now the links must work with Ajax

Making a http/https post request under a proxy

Here is my post on how to make a https call. http://srikanthjeeva.blogspot.in/2010/06/making-httphttps-post-request.html

Spent a long time in figuring out how to send a https request under a proxy

Here is how it is,

require 'net/http'
require 'net/https'
require 'uri'

uri  = URI('https://IP/api/V1/USERS')

proxy_class = Net::HTTP::Proxy(PROXY_ADDRESS, PROXY_PORT, USERNAME, PASSWORD)

proxy_class.start(uri.host, uri.port, :use_ssl => uri.scheme == 'https', :verify_mode => OpenSSL::SSL::VERIFY_NONE) { |http|
  request = Net::HTTP::Get.new uri.request_uri
  response = http.request request
  puts response.body
}

Hope this helps.
Thanks!

Ruby Conference Pune, India - March 24, 25 - 2012

Caching in Rails

Rails has wonderful inbuilt caching methods. This is how i implemented caching for a particular action. 

 Requirement : Cache a page for 12 hours. After 12 hrs Caching must expire.

  before_filter :clear_cache
  caches_action :index, :layout => false

def index  
    #code
    # Write expiry time to cache (12 hours)
    Rails.cache.write('expiry_time', Time.now + 12.hours)
end


def clear_cache
    #Fetch time from cache and check with current time
    t = Rails.cache.fetch('expiry_time') || Time.now
    t = Time.parse(t) if t.is_a?(String)
    # Expire action if current time > Cached time
    expire_action :action => :index if Time.now > t
 end

Thanks!

Roles implemented with easy_roles plugin

Plugin git repo : https://github.com/platform45/easy_roles 

 

Step 1 : Install Plugin

script/plugin install git://github.com/platform45/easy_roles.git

Step 2 : Generate migration to create column called roles in user's table

rails g easy_roles user roles

Step 3 : Run. rake db:migrate to run the migration

Step 4 : Add this line to the user's model

class User < ActiveRecord::Base
  easy_roles :roles
end

Add users role, remove, check role as follows.

@user = User.first 

@user.add_role 'admin' 

@user.is_admin? 

=> true 

   

@user.has_role? 'admin' 

=> true 

 

@user.is_awesome? 

=> false 

 

@user.add_role 'awesome' 

 

@user.is_awesome? 

=> true 

 

@user.remove_role 'admin' 

 

@user.is_admin? 

=> false 

How to fix Unrecognized command line argument: 'package'

>> rvm package install zlib
ERROR: Unrecognized command line argument: 'package' ( see: 'rvm usage' )

The keyword 'package' is renamed to 'pkg'


Try,


>> rvm pkg install zlib


Njjoy :)

How to fix 'make' is not recognized as an internal or external command

Hi,

I have got this below error.

$ gem install rhodes-3.1.0.gem -l

Building native extensions.  This could take a while...

ERROR:  Error installing rhodes-3.1.0.gem:

        ERROR: Failed to build gem native extension.

c:/InstantRhodes/ruby/bin/ruby.exe extconf.rb

make

'make' is not recognized as an internal or external command,

operable program or batch file.

Gem files will remain installed in c:/InstantRhodes/ruby/lib/ruby/gems/1.8/gems/

rhodes-3.1.0 for inspection.

Results logged to c:/InstantRhodes/ruby/lib/ruby/gems/1.8/gems/rhodes-3.1.0/ext/

gem_make.out

Here is the Fix:
install Devkit for windows by following the steps,
https://github.com/oneclick/rubyinstaller/wiki/development-kit

--
Srikanth