Rails Routing

routes.rb

require 'domain_constraint'

Rails.application.routes.draw do

  constraints DomainConstraint.new('domainname-one.com') do
    root :to => 'landingpages#show', as: '/'
  end

  constraints DomainConstraint.new('domainname-two.io') do
    root :to => 'landingpages#show', as: '/'
  end

  constraints DomainConstraint.new('domainname-three.me') do
    root :to => 'landingpages#show', as: '/'
  end

root "other_parts#index"

end