Question

In my application I have 2 classes like this:

class City < ActiveRecord::Base
  has_many :events
end

class Event < ActiveRecord::Base
  belongs_to :city
  attr_accessible :title, :city_id
end

If I create city object:

city = City.create!(:name => 'My city')

and then pass parameters to create event like this:

event = Event.create!(:name => 'Some event', :city => city)

I get

event.city_id => null

So the question is – is it possible to pass parameters in such a way to get my objects connected, what am I doing wrong? Or should I use other ways (like

event.city = city

)
?

Answer 1

Generally this happens when you have an attr_accessor that excludes or an attr_protected that includes the :city attribute on Event. Allowing :city_id to be accessible does not automatically allow :city to be so.

(NB: this answer provided as per the discussion in comments above, and thus community-wiki.)