codedecoder | breaking into the unknown…

There are time when ActiveRecord query will not server our purpose and you needs to write raw sql query.
Lets understands with examples when such case arise and how to write raw sql. We will also see how irresponsibly written code crash your system.
One of our application facing a lots of out of memory exception in Heroku and also some of payments not at all getting render in UI as Heroku kills any process which take more than 30 seconds....

Devise work out of box for maintaining user session. But it fails to handle redirect in case of ajax request.
Problem  Description:
User logged in to Rails Application using Devise Auth flow.

Our product is in production and we decided to have a new subdomain which will target a different set of Users. The end goal is to have the same Code base but render different CSS based on subdomain.
Since our App is hosted on Heroku, the first thing I do is checked feasibility of two DNS pointing to same app, I raised the below ticket on heroku:...

Below is one of my API code in my new Rails application
The API working fine locally and on server running thin as application server.After testing we moved the code to UAT server running on Passenger as application server and the API boomed with below error:...