Geokit - using :through to connect models


i am currently trying to use :through to attach two of my models
together using geokit. for some reason, i am running into a problem:

ArgumentError: Unknown key(s): as

i have two models, one that is geocoded, and one that belongs to that
model. the models look like:

,----[ employer.rb ]
| class Employer < ActiveRecord::Base
| acts_as_mappable
| before_validation_on_create :geocode_address
| has_many :internships
| belongs_to :account
| belongs_to :role
| private
| def geocode_address
| geo=GeoKit::Geocoders::MultiGeocoder.geocode(address1 + " " + city + " " + state + " " + zip)
| errors.add(:address, “Could not Geocode address”) if !geo.success
|, self.lng =,geo.lng if geo.success
| end
| end

and an internship:

,----[ internship.rb ]
| class Internship < ActiveRecord::Base
| has_many :internship_categories
| belongs_to :employer, :polymorphic => true
| acts_as_mappable :through => :employer
| end

it seems like there is an intermediary object in the docuements called
‘:locatable’ that connects the the two together, but i just can’t get
how that is being called, or what i am supposed to do with it.

no matter where i put it, i end up with this error:

ArgumentError: Unknown key(s): as

if i remove: “:as => :locatable” i end up with a problem in that the
model doesn’t have :lat or :lng, which makes me think that
the :through is not working at all.

please let me know how to attack this…


I think your trouble here is with the polymorphic association. (Why do
you need it - is there another model that has_one or has_many
:internships :as => :employer?)

Try either removing :polymorphic => true if you don’t need it, or
adding :as => :employer to the Employer’s has_many :internships line.

On Sun, Feb 22, 2009 at 11:12 PM, Sergio R.

thanks for your help!

i am gonna have to look into this a little bit more to get my head
around this…