Geocoding multiple addresses in one model - ruby-on-rails

Question

I am trying to geocode 2 addresses in a model using geocoder and I can't get gem to work as I want to. Here is the code that I am applying to my model:
class Sender < ActiveRecord::Base
validates_presence_of :source_address
validates_presence_of :destination_address
geocoded_by :source_address, :latitude => :latitude1, :longitude => :longitude1
geocoded_by :destination_address, :latitude2 => :latitude2, :longitude2 => :longitude2
def update_coordinates
geocode
[latitude1, longitude1, latitude2, longitude2]
end
after_validation :geocode
Here is code for views/senders/show.html.erb:
<%= #sender.latitude1 %>
<%= #sender.longitude1 %>
<%= #sender.latitude2 %>
<%= #sender.longitude2 %>
Result : 35.6894875 139.6917064 - Isn't it supposed to send me back 2 address information?
Here is my js:
<script type="text/javascript">
function initialize() {
var source = new google.maps.LatLng(<%= #sender.latitude1 %>, <%= #sender.longitude1 %>);
var dest = new google.maps.LatLng(<%= #sender.latitude2 %>, <%= #sender.longitude2 %>);
var mapOptions = {
center: source,
zoom: 8
}
var mapOptions2 = {
center: dest,
zoom: 8
}
var map = new google.maps.Map(document.getElementById('map_canvas'), mapOptions);
var map2 = new google.maps.Map(document.getElementById('map_canvas2'), mapOptions2);
var marker = new google.maps.Marker({
position:source,
map: map
});
var marker2 = new google.maps.Marker({
position:dest,
map: map2
});
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>

Answer 1

The problem and solution are mentioned here.
Add the following before_save and corresponding method to your model to solve the problem. Don't forget to repeat the part of code for the second location (maybe destination):
before_save :geocode_endpoints
private
#To enable Geocoder to works with multiple locations
def geocode_endpoints
if from_changed?
geocoded = Geocoder.search(loc1).first
if geocoded
self.latitude = geocoded.latitude
self.longitude = geocoded.longitude
end
end
# Repeat for destination
if to_changed?
geocoded = Geocoder.search(loc2).first
if geocoded
self.latitude2 = geocoded.latitude
self.longitude2 = geocoded.longitude
end
end
end

Answer 2

Rewrite
def function
...
end
as:
def update_coordinates
geocode
[latitude, longitude, latitude2, longitude2]
end
And also:
geocoded_by :destination_address, :latitude => :latitude2, :longitude => :longitude2
You also don't need :latitude => :lat, :longitude => :lon here:
geocoded_by :source_address, ...
And finally, coordinates are fetched automatically after record is validated. So you could do without update_coordinates (or function, in your version) and arrange the view for show action like this:
<%= #sender.latitude %>
<%= #sender.longitude %>
<%= #sender.latitude2 %>
<%= #sender.longitude2 %>