Ruby on Rails

Facebook share url in rails ?   https://www.facebook.com/dialog/feed?app_id=14563499550189 &display=popup&caption=An%20example%20caption&link=https%3A%2F%2Fdevelopers.facebook.com%2Fdocs%2&redirect_uri=https://developers.facebook.com/tools/explorer

Omniauth facebook email id not getting in rails? Better way use the koala api get the email address Steps 1)gem "koala" 2)bundle install 3)Get the request.env['omniauth.auth'] 3)@graph = Koala::Facebook::API.new( request.env['omniauth.auth']['credentials']['token'] ) 4)user_email = @graph.get_object("me?fields=email")

How to add external fonts on rails application with twitter bootstrap? 1)Add the fonts folder inside the assets   2)add the below code for app/assets/styleheets/application.css @font-face {   font-family: 'font_name';   src: url('../assets/font_file_name.otf'); } body{ font-family: 'font_name';    }

Rails 3 to Rails 4 Migrations Ruby Version 2.2.2 Rails Version 4.2.3 Modification files 1)Gemfile Latest Gems related versions 2)Routes Change the match method with via get or post 3)Controllers New params creating and updating the data. i)params.require(:person).permit(:name, :age) 4)Models Active Record queries need to change i)Profile.where(“code is not null”) Profile.where.not(code: null) ii)Write the scopes in Models 5)Javascripts,stylesheets,images_paths Move the javascriptfiles and stylesheets to assets folder 6)Facebook,Linkedin,Twitter apis need to change Code changes Latest versions of the API Git Related Commands git branch List of branches for the git git chekout -b newbranc...

Gem::LoadError (Specified 'mysql2' for database adapter, but the gem is not loaded. Add `gem 'mysql2'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord).) In rails? 1)change the gemfile in mysql version  gem 'mysql2' 2)Change to mysql2 version  gem 'mysql2','0.3.20'

What are some GUI clients for Git? git gui  - graphical commit tool, in Tcl/Tk, distributed with Git (usually in  git-gui  package) git-cola  - uses PyQt4 install all git gui tools sudo apt-get update && sudo apt-get install git-all Usage of git Gui 1)Project folder -> git gui 2)add the what are the files need to be commit 3)Add the git commit name 4)git push origin master  git-cola also same as the git gui

Amazon ec2 open new port assets are not loading in rails 4.2.0? config/environments/production.rb   config.serve_static_files = ENV['RAILS_SERVE_STATIC_FILES'].present? Line change to   config.serve_static_files = true

http://dennissuratna.com/rails-deployment-aws2/

Running screen on background in rails? 1)screen -S screenname 2)rails  s -b 0.0.0.0 -p 8088 3)Ctrl+ad 4)screen -r display the screen names 5)screen -r screenname 6)kill -9 pid http://www.tecmint.com/screen-command-examples-to-manage-linux-terminals/

 Difference between rake db:migrate db:reset and db:schema:load in rails? db:migrate   runs (single) migrations that have not run yet. db:create   creates the database db:drop   deletes the database db:schema:load   creates tables and columns within the (existing) database following schema.rb db:setup   does db:create, db:schema:load, db:seed db:reset   does db:drop, db:setup   Normally, db:migrate used after having made changes to the schema via new migration files after creating db i.e when db already exists. db:schema:load is used when you setup a new instance of your app.

Creating Branches In git? 1)git checkout -b newbranchname 2)git add . 3)git commit -m "first commit on new branch" 4)git push origin newbranchname Switching from one branch to another branch git checkout branchname Localchanges not requires git stash Conflict with git merges 1)git stash 2)git pull 3)git stash pop git merge branchname Git checkout with master git chekout master Checking the git branch  git branch git pull = git fetch + git merge Git update the only for particular commits git cherry-pick gitcommitid Change mode permissions for file chmod 600 filename

Steps For Http post using rest client Calling the Api calls in ruby on rails 1)gem install rest-client 2)We need to keep in whereever we want to use in rails controller Example: require 'rest-client' class UsersController < ApplicationController response = RestClient.post 'http://chinnaror.blogspot.in/test', :name => "koti",:email => "kotesh.raogaru@gmail.com" data = JSON.parse response.body p "data here......." p data.inspect p 999999999999999999999 end In Chrome we can use the " Postman"   browser Software Link: https://chrome.google.com/webstore/detail/postman/fhbjgbiflinjbdggehcddcbncdddomop?hl=en In Mozilla We can use the " Restclient"   browser Software Link: https://addons.mozilla.org/en-US/firefox/addon/restclient/

Installation of ngrok using Public Ip address in rails 1)sudo apt-get install ngrok 2)https://ngrok.com/download -> Downloadngrock 3)unzip ngrokfile 4)./ngrok -help 5)./ngrok http 3004 6)http://ec0406bd.ngrok.io --> Get the Public Ip Address 7)ctrl+c --> Exit

sudo apt-get install libgdbm-dev libncurses5-dev automake libtool bison libffi-dev curl -L https://get.rvm.io | bash -s stable source ~/.rvm/scripts/rvm rvm install 2.0.0-p645 rvm use 2.0.0-p645 --default ruby -v rvm gemset create rails3.2.8 rvm gemset use rails3.2.8 gem install rails -v 3.2.8

1)What is the difference between include and extend? Ans: i)Include makes the module methods are available instance of the class.     1)Not available at the class level     2)Available at the instance level ii)extend makes module methods are available class itself.     1)Not available at the class level     2)Available at the instance level   here is a big difference between include and extend in Ruby. Let me show you some code to explain it : Exampl1: module Printable   def self.class_method_x     p 'class_method_x'   end   def instance_method_y     p 'instance_method_y'   end end — class ExtendDocument   extend Printable end — class IncludeDocument   include Printable end First round, on the Printable module : Printable.class_method_x # => "class_method_x" — Printable.instance_method_y # => NoMethodError: undefined method `instance_method_y' for Printable...