[Rails] How to set new object fields with not-hash object in ActiveRecord?

[Haruka YAGNI]

Hi, everyone.
I am using Geokit and Geokit-Rails3 on Ruby on Rails 3.0.3 / Ruby
1.8.7.

My model Location (which acts_as_mappable) is often created with lat
and lng.

For avoiding repeating yourself, I tried to override initialize method
and try to use Geokit::LatLng.normalize (this method creates a LatLng
object from string/array/etc..), but the following codes does not
work, and show curious errors.

There are also tests using the original style (:lat=>..., :lng=>...)
and they works fine.
According to "p ll" in location.rb, ll is correct.

Thanks in advance.

-- location.rb
class Location < ActiveRecord::Base
  acts_as_mappable :default_units=>:kms, :default_formula=>:flat
  attr_accessible :lat, :lng

  def initialize(args)
    begin
      ll = Geokit::LatLng.normalize(args)
      p ll
      lat = ll.lat; lng = ll.lng
    rescue
      super
    end
  end
end

-- a part of location_spec.rb
    it "should make new Location from LatLng object" do
      Location.create!(Geokit::LatLng.normalize("35,135")).lat.should
== 35
    end

    it "should make new Location from String" do
      Location.create!("35, 150").lat.should == 35
    end

    it "should make new Location from Array" do
      p Location.new([35,150])#.lat.should == 35
    end

-- errors (shortly)
  NoMethodError: ... while evaluationg nil.[]
  NoMethodError: undefined method `has_key?' for nil:NilClass  (in `p')

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