Missing default_host_options in rails model

gistfile1.rb

# application_controller.rb
before_filter :default_hosts

# set dynamically to always correct paths and urls (dev, stage, testing)
def default_hosts
  ActionController::Base.default_url_options[:host] = request.host_with_port
  ActionMailer::Base.default_url_options[:host] = request.host_with_port
end


# my_model.rb
class MyModel < AR::Base
    
  def return_url
    Rails.application.routes.url_helpers.verify_paypal_payment_notifications_url(order_id)
  end
  
end


# this results in
# Missing host to link to! Please provide :host parameter or set default_url_options[:host]

# so what's the best practise to get this error down?

I think it is general consense that you shouldn't be handling URLs in your models. If you really need to do this for an exceptional reason you can do it like this:

    include Rails.application.routes.url_helpers
    default_url_options[:host] = 'xxx' # usually read from config

Then you can use the helpers as usual:

    url = content_url(self)

Thanks! I take this for now. Maybe there's an even nicer solution to this ...

I think if you are calling a method the preferred solution is to pass to the URL from the view, e.g.

    # app/models/foo.rb
    def some_fancy_method(url)
      # do something with url and return result
    end

    # app/views/foo.erb.html
    @foo.some_fancy_method(content_url(foo.content))