Get root_url in a Rails service

Question

The app I'm working on makes heavy use of Rails services . My problem is I need to get the root url of the app, similar to how you would use root_url in a view, but this doesn't work in a service. Does anyone know a way to do this other than entering the url in each of my environment setting files?

Edit

I tried using Rails.application.routes.url_helpers.root_url as it suggests to do here stackoverflow.com/a/5456103/772309 but it expects you to pass the :host => ... in as a parameter. That's what Im trying to find.

Answer 1

Based on what I've read from the linked 'Rails services' article, the services are just plain old ruby objects. If that's the case, then you'd need to pass the root_url from the controller to the initializer of your service object. To extend the example from that article:

UsersController

class UsersController < ActionController::Base
  ...
  private
  ...

  def register_with_credit_card_service
    CreditCardService.new({
      card: params[:stripe_token],
      email: params[:user][:email],
      root_url: root_url
    }).create_customer
  end
end

CreditCardService

class CreditCardService
  def initialize(params)
    ...
    @root_url = params[:root_url]
  end
end

EDIT: Alternative solution that leverages the Rails.application.config

class UsersController < ActionController::Base
  before_filter :set_root_url

  def set_root_url
    Rails.application.config.root_url = root_url
  end
end

class CreditCardService
  def some_method
    callback_url = "#{Rails.application.config.root_url}/my_callback"
  end
end

Answer 2

Since you're opposed to putting it in your environment folders you could do something like below in your App controller

class ApplicationController < ActionController::Base
  def default_url_options
    if Rails.env.production?
      {:host => "myproduction.com"}
    else  
      {}
    end
  end
end