From 1a4d501c00cbc032da3d032c3cc3022a59af59f4 Mon Sep 17 00:00:00 2001
From: Alex Reisner <alex@alexreisner.com>
Date: Thu, 1 Oct 2009 00:54:35 -0400
Subject: [PATCH] Add 'nearbys' instance method.
---
README.rdoc | 1 +
lib/geocoder.rb | 34 ++++++++++++++++++++++++++++++----
2 files changed, 31 insertions(+), 4 deletions(-)
diff --git a/README.rdoc b/README.rdoc
index 1987b505..6c93dbf7 100644
--- a/README.rdoc
+++ b/README.rdoc
@@ -43,6 +43,7 @@ Assuming +obj+ has a valid string for its +location+:
obj.fetch_coordinates # returns coordinates [lat, lon]
obj.fetch_and_assign_coordinates # writes values to object
+ obj.nearbys(30) # gets other objects within given radius
Find distance between object and a point:
diff --git a/lib/geocoder.rb b/lib/geocoder.rb
index 576c1fdc..82f95ee5 100644
--- a/lib/geocoder.rb
+++ b/lib/geocoder.rb
@@ -110,6 +110,22 @@ module Geocoder
defined?(@geocoder_longitude_attr) ?
@geocoder_longitude_attr : :longitude
end
+
+ ##
+ # Get the coordinates [lat,lon] of an object.
+ # This seems cleaner than polluting the object method namespace.
+ #
+ def get_coordinates_of(object)
+ [object.send(geocoder_latitude_attr),
+ object.send(geocoder_longitude_attr)]
+ end
+ end
+
+ ##
+ # Is this object geocoded? (Does it have latitude and longitude?)
+ #
+ def geocoded?
+ self.class.get_coordinates_of(self).compact.size > 0
end
##
@@ -117,14 +133,24 @@ module Geocoder
# are defined in <tt>distance_between</tt> class method.
#
def distance_to(lat, lon, units = :mi)
- mylat = read_attribute(self.class.geocoder_latitude_attr)
- mylon = read_attribute(self.class.geocoder_longitude_attr)
+ return nil unless geocoded?
+ mylat,mylon = self.class.get_coordinates_of(self)
Geocoder.distance_between(mylat, mylon, lat, lon, :units => units)
end
##
- # Fetch coordinates based on the object's location. Returns an
- # array <tt>[lat,lon]</tt>.
+ # Get other geocoded objects within a given radius.
+ # The object must be geocoded before this method is called.
+ #
+ def nearbys(radius = 20)
+ return [] unless geocoded?
+ lat,lon = self.class.get_coordinates_of(self)
+ self.class.find_near([lat, lon], radius) - [self]
+ end
+
+ ##
+ # Fetch coordinates based on the object's location.
+ # Returns an array <tt>[lat,lon]</tt>.
#
def fetch_coordinates
location = read_attribute(self.class.geocoder_method_name)
--
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