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.

Possible duplicate of [Can Rails Routing Helpers (i.e. mymodel\_path(model)) be Used in Models?](http://stackoverflow.com/questions/341143/can-rails-routing-helpers-i-e-mymodel-pathmodel-be-used-in-models) — Dave Schweisguth, May 09 '16 at 17:51
@DaveSchweisguth I tried using `Rails.application.routes.url_helpers.root_url` as it suggests to do here http://stackoverflow.com/a/5456103/772309 but it expects you to pass the `:host => ...` in as a parameter. That's what Im trying to find. — Ryan Grush, May 09 '16 at 17:56
http://stackoverflow.com/questions/7154914/how-to-get-host-name-in-rails-3 might help there. — Dave Schweisguth, May 09 '16 at 18:05
@DaveSchweisguth I tried that but I'm having the same problem as the first commenter - "I tried your easy solution on my local machine and it returns my machine's name while I'd like to get 'localhost:3000'" — Ryan Grush, May 09 '16 at 18:20
How about this answer? http://stackoverflow.com/a/17574412/634576 — Dave Schweisguth, May 09 '16 at 18:24
@DaveSchweisguth I got a `undefined local variable or method request` error since a Rails service doesn't receive an http request like a controller normally would. — Ryan Grush, May 09 '16 at 18:32
Presumably your service is used in a controller action. The idea is to save the host:port in `ActionMailer::Base.default_url_options[:host]` in the controller, then retrieve it from there in your service. — Dave Schweisguth, May 09 '16 at 18:36
@DaveSchweisguth This should work but I think I'm going to just set it in my environment settings. There's a good chance I'm going to need it somewhere else down the road. Thanks for your help though! — Ryan Grush, May 09 '16 at 18:44

Doug Miller · Answer 1 · 2016-05-10T04:33:15.320

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

That's definitely one way to do it, and yes services are just plain ruby objects. The problem with my current use case is that I would have to pass it through multiple services and to a separate server and back, obviously not the most elegant solution. Your answer would work best for most cases however. — Ryan Grush, May 09 '16 at 19:36
Understood, then take a look at the edit that I included. I used the UserController again because that was the original example from the article. I typically start with an ApplicationController and have all of my other controllers extend it. I would add the before_filter there that will set the config.root_url for all routes. — Doug Miller, May 10 '16 at 04:34

score 0 · Answer 2 · answered May 09 '16 at 18:13

0

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

answered May 09 '16 at 18:13

bkunzi01

4,504
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I'm not opposed to putting it in my environments folder, was just hoping there was a native Rails method I could call to get the hostname. Its looking like my environment settings is the way to go. – Ryan Grush May 09 '16 at 18:18

Get root_url in a Rails service

2 Answers2