Allow geo indexing/search on types other than Float

E.g. BigDecimal etc. -- the GeoHash library enforces Floats, so cast
arguments to_f before encoding.

sunspot/lib/sunspot/query/geo.rb

@@ -11,7 +11,7 @@ class Geo
 
       def initialize(field, lat, lng, options)
         @field, @options = field, options
-        @geohash = encode(lat, lng, MAX_PRECISION)
+        @geohash = encode(lat.to_f, lng.to_f, MAX_PRECISION)
       end
 
       def to_params

sunspot/lib/sunspot/type.rb

@@ -348,7 +348,7 @@ def indexed_name(name)
       end
 
       def to_indexed(value)
-        encode(value.lat, value.lng, 12)
+        encode(value.lat.to_f, value.lng.to_f, 12)
       end
     end
 

sunspot/spec/api/indexer/attributes_spec.rb

@@ -1,4 +1,5 @@
 require File.join(File.dirname(__FILE__), 'spec_helper')
+require 'bigdecimal'
 
 describe 'indexing attribute fields', :type => :indexer do
   it 'should correctly index a stored string attribute field' do
@@ -90,6 +91,13 @@
     connection.should have_add_with(:coordinates_s => 'dr5xx3nytvgs')
   end
 
+  it 'should index latitude and longitude passed as non-Floats' do
+    coordinates = Sunspot::Util::Coordinates.new(
+      BigDecimal.new('40.7'), BigDecimal.new('-73.5'))
+    session.index(post(:coordinates => coordinates))
+    connection.should have_add_with(:coordinates_s => 'dr5xx3nytvgs')
+  end
+
   it 'should correctly index an attribute field with block access' do
     session.index(post(:title => 'The Blog Post'))
     connection.should have_add_with(:sort_title_s => 'blog post')

sunspot/spec/api/query/geo_examples.rb

@@ -1,4 +1,5 @@
 require File.join(File.dirname(__FILE__), 'spec_helper')
+require 'bigdecimal'
 
 shared_examples_for 'geohash query' do
   it 'searches for nearby points with defaults' do
@@ -8,6 +9,13 @@
     connection.should have_last_search_including(:q, build_geo_query)
   end
 
+  it 'searches for nearby points with non-Float arguments' do
+    search do
+      with(:coordinates).near(BigDecimal.new('40.7'), BigDecimal.new('-73.5'))
+    end
+    connection.should have_last_search_including(:q, build_geo_query)
+  end
+
   it 'searches for nearby points with given precision' do
     search do
       with(:coordinates).near(40.7, -73.5, :precision => 10)