Automatically Detecting IP and displaying appropriate city using Geocoder and Ruby on Rails

Question

I've been trying to write some code that automatically detects the IP address of the website visitor and displays the corresponding city. I thought this would be as simple as using Geocoder to detect the IP then display the corresponding city, however I am having no success.

I've been looking through documentation that claims to be compatible with IP addresses, but either I'm doing something incorrectly, or the documentation is wrong: http://rdoc.info/github/alexreisner/geocoder/master/frames

I have this in my location.rb model, which supposedly provides data such as result.city as a string.

class Location < ActiveRecord::Base
  attr_accessible :address, :latitude, :longitude

  reverse_geocoded_by :lat, :lon do |obj,results|
      if geo = results.first
        obj.city    = geo.city
        obj.zipcode = geo.postal_code
        obj.country = geo.country_code
      end
    end
    after_validation :reverse_geocode

end

So I added @city = result.city to my locations_controller.rb

def index
    @locations = Location.all
    @city = result.city
  end

Then to test that it worked I put <%= @city %> into my index.html.erb in locations.

Upon rendering the page I receive an error in my controller, stating that 'result' has not been defined:

undefined local variable or method `result' for #<LocationsController:0x007faf9d5009e8>

app/controllers/locations_controller.rb:7:in `index'

Where am I going wrong? Or why doesn't the model function as described?

I got IP now by going (at)ip = request.remote_ip in the index in the locations controller, but now I'm trying to define (at)city in the index to find the corresponding city for the ip address. Thanks. — Laser, Apr 11 '12 at 18:53
Sorry for all the noise, I realized that (at)city = request.location.city was displaying nothing because I was running a local server, upon deployment to heroku it displays what is intended. — Laser, Apr 11 '12 at 19:03
Since your problem is solved, you can either delete the question or add an answer and accept it (if you think the question/answer could be useful to someone else). — Justin D., Apr 11 '12 at 20:13
Hi @Laser, I know this is a long time ago but if you still remember how to do it would you make a post or tell me how to do the same thing but in Rails 4? I'm searching for a similar way to do what you've done (http://stackoverflow.com/q/32102967/4484024) — Henry Lee, Aug 19 '15 at 20:17

Automatically Detecting IP and displaying appropriate city using Geocoder and Ruby on Rails

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