geokit - using :through to connect models

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.

http://wiki.rubyonrails.org/rails/pages/UnderstandingPolymorphicAssociations

thanks for your help!

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

thanks!