Rails routing to handle multiple domains on single application

ruby-on-rails ruby-on-rails-3 routing routes subdomain

1) define a custom constraint class in lib/domain_constraint.rb:

class DomainConstraint  def initialize(domain)    @domains = [domain].flatten  end  def matches?(request)    @domains.include? request.domain  endend

2) use the class in your routes with the new block syntax

constraints DomainConstraint.new('mydomain.com') do  root :to => 'mydomain#index'endroot :to => 'main#index'

or the old-fashioned option syntax

root :to => 'mydomain#index', :constraints => DomainConstraint.new('mydomain.com')

ruby-on-rails ruby-on-rails-3 routing routes subdomain

In Rails 5, you can simply do this in your routes:

constraints subdomain: 'blogs' do  match '/' => 'blogs#show'end

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