Rails - Nov 2006 - one to many relationship; has_one

I''m new to ruby and rails and as a result am a bit lost on implementing
a one to many relationship.  In my DB I have 2 tables contents and 
locations, contents contains the foreign key location_id.  I generated a 
content and a location model using rails scripts and then edited the 
models as follows

class Content < ActiveRecord::Base
  has_one :location
end

class Location < ActiveRecord::Base
    belongs_to :content
end

When I attempt to access content.location I get this error

|RuntimeError: ERROR	C42703	Mcolumn locations.content_id does not exist
Fparse_func.c
L1036	Runknown_attribute: SELECT * FROM locations WHERE (locations.content_id =
9)  LIMIT 1|


I have been able to work around this by defining the association in the 
content class as
has_many :location, :finder_sql => ''SELECT * FROM locations WHERE 
locations.id = #{location_id}''

I attempted defining this association as has_one, but I am then not able 
to overwrite finder_sql.  I am hoping someone can explain a few things 
to me.
Firstly, why does has_one expect locations to contain the content_id, 
since it would require improper modeling in the DB?
Secondly, how do I properly associate the objects in Rails and overwrite 
the location find method?

Thanks,