Today I Learned

A Hashrocket project

Find host and port in development

Rails 5.1 is a little different the pre 5.1

require 'rails/commands/server/server_command'

In rails 5.0 or below

require 'rails/commands/server'
# lib/host_and_port.rb

def __host_and_port__
  options =!(ARGV)
  options.values_at(:Host, :Port)

You can then find the host and port for various configuration files.

# config/initializers/carrier_wave.rb
require Rails.root.join('lib/host_and_port').to_s

CarrierWave.configure do |config|
  config.asset_host = "http://" + __host_and_port__.join(":")


# config/environments/development.rb
require Rails.root.join('lib/host_and_port').to_s

host, port = __host_and_port__
config.action_mailer.default_url_options = { host: host, port: port }
Looking for help? Hashrocket has been an industry leader in Ruby on Rails since 2008. Rails is a core skill for each developer at Hashrocket, and we'd love to take a look at your project. Contact us and find out how we can help you.