Heroku ActiveAdmin issue | TCP/IP connections on port 5432

-----> Writing config/database.yml to read from DATABASE_URL

-----> Preparing app for Rails asset pipeline

       Running: rake assets:precompile

       rake aborted!

       could not connect to server: Connection refused

       Is the server running on host "127.0.0.1" and accepting

       TCP/IP connections on port 5432?

Solution :

Look at the view source of active admin page it should have 

active_admin.css

print.css

active_admin.js

Include that in production.rb

with     

config.assets.initialize_on_precompile = false

  config.assets.precompile += %w(active_admin.css active_admin.js active_admin/print.css)

And done!