As far as I can see there is no standard method for getting the remote address of your local machine. If you need the remote address for (testing) your geocoding, I suggest adding 127.0.0.1 to your database table that matches IP addresses with locations.
As a last resort you could also hard code your remote address. E.g. like this:
class ApplicationController < ActionController::Base
def remote_ip
if request.remote_ip == '127.0.0.1'
# Hard coded remote address
'123.45.67.89'
else
request.remote_ip
end
end
end
class MyController < ApplicationController
def index
@client_ip = remote_ip()
end
end