How can I view a website running in localhost on machine in chrome browser?
For anyone using Rails 4.2, trying to access via ip address will probably fail due to a change in Rails.
Start the server using rails server -b 0.0.0.0 would allow you to access your localhost from your phone like before.
On your mac go open your network preferences (click the wifi signal at the top). Find the ip address of the network you are currently connected to. In the browser of your phone, type in that ip address and append :3000 to the end of it