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Right now I'm using this which works for the development host, but I have to manually change the {:host => ""} code when I move to production. post.rb def share_all url = Rails.application.routes.url_helpers.post_url(self, :host => 'localhost:3000') if user.authentications.where(:provider => 'twitter').any? user.twitter_share(url) end end I'd like to use this and then define the default_url_options per environment: post.rb def share_all url = Rails.application.routes.url_helpers.post_url(self) if user.authentications.where(:provider => 'twitter').any? user.twitter_share(url) end end I've tried adding this to my config/environments/development.rb but I still get the "Missing host to link to! Please provide :host parameter or set default_url_options[:host]" error development.rb config.action_controller.default_url_options = {:host => "localhost:3000"} And I even tried it this way: development.rb config.action_controller.default_url_options = {:host => "localhost", :port => "3000"} EDIT: I've now also followed this and still the same error guide http://edgeguides.rubyonrails.org/action_controller_overview.html#default_url_options application controller class ApplicationController < ActionController::Base protect_from_forgery include ApplicationHelper def default_url_options if Rails.env.production? { :host => "example.com"} else {:host => "example1.com"} end end end This is driving me crazy, what am I missing here???

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