rails get app root/base url

Question

In my app I have a few APIs that under api domain. Now in one of the API I want to generate a url that pointing to the main domain, say

test.com/blabla...
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Answer 1

Simplest alternative method:

include in you're class

include Rails.application.routes.url_helpers

create function or just use root_url to get app root/base url:

  def add_host_prefix(url)
    URI.join(root_url, url).to_s
  end

finally: add

Rails.application.routes.default_url_options[:host] = 'localhost:3000'

in:

Your_project_root_deir/config/environments/development.rb

although helpers can be accessible only in views but this is working solution.