Rails - May 2010 - Validating the presence of foreign keys /associated objects

hi guys,

 I been trying to find out on how to validate the presence of foreign
keys/associated objects and the threads that talk about this are
rather dated and unanswered. I looked at

1)
http://groups.google.com/group/rubyonrails-talk/browse_thread/thread/f8175db2a8321750/d565496a3672f19f?lnk=gst&q=validates+presence+foreign#d565496a3672f19f
2)
http://groups.google.com/group/rubyonrails-talk/browse_thread/thread/cff66eead0e5580b/c032b19f1832b2e0?lnk=gst&q=validates+presence+foreign#c032b19f1832b2e0


Consider this:


class Part < ActiveRecord::Base
  belongs_to :brand
  belongs_to :category
  belongs_to :sub_category
  belongs_to :user
  belongs_to :status
  has_many   :fits
  has_many   :images, :dependent => :destroy

 
validates_presence_of :title, :description, :category, :location, :contact_name,
:contact_number, :condition
end

class Brand < ActiveRecord::Base
  has_many :designs
  validates_presence_of :name
end

class Fit < ActiveRecord::Base
    belongs_to :Part
    belongs_to :Brand

    validates_presence_of :part_id

end


When  I hit the "submit" button  to purposely try and create a new
"Fit" object without selected a Brand (the brand is a drop down box)
and the Part ID is a hidden field, no errors come up.

 How do I validate the presence of the "Part ID" (or part object)
within the Fit model?
I tried putting " validates_presence_of :part_id" and it does not
work.

Any ideas, guys?

thanks

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On Thu, May 6, 2010 at 10:20 AM, ct9a
<anexiole-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:


> class Fit < ActiveRecord::Base
>    belongs_to :Part
>    belongs_to :Brand
It probably doesn''t make a difference, but conventionally the
attribute ids should be lowercase

     belongs_to :part
     belongs_to :brand
>
>    validates_presence_of :part_id
The association name is :part not :part_id
so

    validates_presence_of :part

HTH

-- 
Rick DeNatale

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