For reverse geocoding your model must provide a method that returns an address. This can be a single attribute, but it can also be a method that returns a string assembled from different attributes (eg: +city+, +state+, and +country+).
*Mongoid:* Define your address and coordinate fields right in the model. You also need to include the <tt>Geocoder::Model::Mongoid</tt> module _before_ calling <tt>geocoded_by</tt>:
field :address
field :latitude, :type => Float
field :longitude, :type => Float
include Geocoder::Model::Mongoid
geocoded_by :address
=== Model Behavior
In your model, tell Geocoder which method returns your object's full address:
