How to find the users within 10miles using latitude and longitude of the user in rails?

Question

I have latitude and longitude of all the user. I have to find the user who is near to me (around 10 miles) from my current latitude and longitude. And i have to give it as response in json. I have tried to configure geokit gem for this but it showed me some error like

WARNING: geokit-rails requires the Geokit gem. You either don't have the gem installed,
or you haven't told Rails to require it. If you're using a recent version of Rails: 
  config.gem "geokit" # in config/environment.rb
and of course install the gem: sudo gem install geokit

so i have moved to geocoder. What should i do with this geocoder for finding users with the above said conditions? please help me.

Answer 1

class User < ActiveRecord::Base
  geocoded_by :address

  after_validation :geocode, if: :address_changed?
end

User.near([latitude, longitude], 10).to_json

# or even simpler since current_user is a geocoded object (i.e has lat/long)

User.near(current_user, 10).to_json