Google Integration Using Devise and Omniauth In Rails App.


Ruby on Rails


In this blog i’ll show how to integrate Google authentication using devise.To install devise you can refer to my blog here.

Add the gems in your gem file

gem ‘devise’gem 'omniauth'gem 'omniauth-google-oauth2' 

Run the “bundle install” command to install the gem.

You need two more columns to store provider type and userid given from google

rails g migration AddProviderToUsers provider:string uid:string

Runt rake db:migrate to insert the columns in users table.

Go the user model “user.rb” and add the following line

devise : omniauthable

First of all you need to create an app in google to get “Client key” and “Client Secret key”

Create an app and get the Client id and secret key.

Now you need to declare the provider name and client id and key.Go to the file config/initializers/devise.rb and the following line

require 'omniauth-google-oauth2' config.omniauth :google_oauth2, "APP_ID", "APP_SECRET"…

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minimum maximum validation between two attributes


There have been many instances when working with rails application, I had to put the minimum, maximum custom validator or active record callbacks check if the maximum value is valid compared to minimum value.

Few such examples are:

1. Comparing minimum and maximum salary.
Maximum salary should not be less than the minimum salary. It can only be equal or greater than the minimum salary.
Minimum salary or Maximum salary can be blank because we might have constraint on minimum salary and no cap on maximum salary or vice a versa.

2. Comparing the age.
Comparing the father son age. Son’s age should not be more than father’s age

3. Comparing Minimum, maximum points to avail an offer.

Though writing a custom validator is a matter of 5 minutes. But for each of the case in different application you have to repeat the code in one of the module or…

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Export data to CSV and Excel in your Rails

Cloud Computing | #CloudFoundry | Ruby | Go | OpenStack | Ansible | Docker | Jenkins

A common requirement from customers is the ability to export tabular data to a CSV file that can be imported into Excel. Ruby on Rails uses the standard ruby CSV library to import test fixtures that are in CSV format.

Below are the steps we need to follow.

1. require the CSV library to controller, Where we need to write import code

require 'csv'

2. Emport code in controller

def export_to_csv       
    @users = User.find(:all)
    csv_string = CSV.generate do |csv|
         csv << ["Id", "Name", "Email","Role"]
         @users.each do |user|
           csv << [,,, user.role]
   send_data csv_string,
   :type => 'text/csv; charset=iso-8859-1; header=present',
   :disposition => "attachment; filename=users.csv" 
end @users = User.find(:all)
Fetching all user details and assigned on @users
csv_string = CSV.generate do |csv|
Using CSV class generate method to create csv file
csv << ["Id", "Name"…

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Using Google Apps Scripts as a back end

Using Google App’s Script as a back end


I recently built a quick internal web app for mobiles using Sencha Touch, and I needed a back end system for very simple content management. As this was a lightweight project without a need for ongoing support and with no expectation of high use, I didn’t want to build a whole back end, or pay for an out of the box solution that would feel like overkill – and not having control of the server was a factor too.

I decided to use Google Spreadsheets for the ad hoc back end, knowing they had an API that supports JSON, but not having explored it before. Sencha Touch comes with handy AJAX and JSONP handlers that I wanted to use as well; the JSON needs to be clean and in a useful format for this to work out of the box – unfortunately what the Spreadsheets API gives you is very…

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