README

A link shortener app written in Ruby on Rails.

Ruby version

Ruby 2.5.0

Rails version

Rails 5.1.6

System dependencies

1. This app uses Redis cache. So make sure you start Redis before running the app.
2. Testing suite requires phantomjs to be installed. You can install it with homebrew on mac:

   brew install phantomjs
   

How to run the test suite

rails test
rails test:system

Scalability

This app can handle 1k urls a day with each getting hit 20k times a day by adding the following caches:

1. A cache that stores the shortened URL with the long URL. No need to hit the database after first visit.
2. A cache that stores the usage counter. It will write back to db every 100 visits.
3. A cache that stores the stat object. No need to hit the stat table for each visit.