Ruby on Rails

On Apr 29, 11:16 am, Haruka YAGNI <hya...@gmail.com> wrote:
> 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
This doesn't actually set your attributes, it just creates 2 local
variables.
Moreover, you're not (unless an exception is thrown) calling super, so
active record's internal state isn't setup correctly - somethig like
super(:lat => ll.lat, :lng => ll.lng) is probably alright.
You probably also want to be careful of the case where the object is
being loaded from the database

Fred

>   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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