Implementing Location Checkin Rails

I am trying to implement location "checkins" in my Rails 3 application.

For example: User searches for a place and we can find the latitude and longitude of the that place and allow the user to "check in" there.

Is there a gem that can help to a开发者_如何学Gochieve that?

Thanks in advance!

The gem you're looking for is 'geocoder' and there is a great screencast about this at http://railscasts.com/episodes/273-geocoder?autoplay=true