Merge branch 'fix_mongoid_nearbys'

lib/geocoder/stores/mongoid.rb

@@ -8,6 +8,16 @@ module Geocoder::Store
 
     def self.included(base)
       MongoBase.included_by_model(base)
+      base.class_eval do
+
+        ##
+        # Name of the attribute to use when determining whether two
+        # records are the same record.
+        #
+        def self.primary_key
+          "_id"
+        end
+      end
     end
   end
 end