geocoder

product.rb

searchable do
    string :search_near 
    location :location do
      Sunspot::Util::Coordinates.new(store.latitude, store.longitude) if store
    end
  end

  def search_near
    store.address if store
  end

search_controller.rb

q.with(:location).in_radius(*Geocoder.coordinates(params[:search_near]), 100) if params[:search_near].present?