Rails - Jun 2006 - acts_as_tree problem accessing parent object

i have a model called certification_types that i''ve declared as 
acts_as_tree.  I have a model called certification that belongs_to 
:certification_type .

class CertificationController < ApplicationController
    .....
    def summary_list
	@certifications = Certification.find(:all, :order=>''date'')
    end
end

summary_list.rhtml
 <% for certification in @certifications %>
		<%= certification.certification_type.parent.id %>
 <% end %>


so, the line above (<%= 
certification.certification_type.parent.type_description %> ) does not 
work; it says The error occured while evaluating nil.type_description.

if i do a debug(certification.certification_type.parent) it shows that i 
have a hash of values:
--- !ruby/object:CertificationType
attributes:
  type_description: Allergy & Immunology
  id: "12"
  parent_id: "11"

can anyone help me with how to access the parent type_description when 
looping through my collection?

Thanks,

Nate

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Posted via http://www.ruby-forum.com/.

>  <% for certification in @certifications %>
> 		<%= certification.certification_type.parent.id %>
>  <% end %>

...my guess is that the reason you are getting nil is because there must 
be cases in the loop that certification does not have a certification 
type - - did you put the 
"debug(certification.certification_type.parent)" AFTER the loop? , if 
so, you may have gotten the last value of the loop - which does have a 
certification type, but other objects in the loop do not, therefore 
returning a nil object - -
the best way to see if this is correct or not is to put the debug(..) 
inside the loop and see what it returns...

shai

-- 
Posted via http://www.ruby-forum.com/.

shai wrote:
> 
> 
>>  <% for certification in @certifications %>
>> 		<%= certification.certification_type.parent.id %>
>>  <% end %>
> 
> 
> ...my guess is that the reason you are getting nil is because there must 
> be cases in the loop that certification does not have a certification 
> type - - did you put the 
> "debug(certification.certification_type.parent)" AFTER the loop?
, if
> so, you may have gotten the last value of the loop - which does have a 
> certification type, but other objects in the loop do not, therefore 
> returning a nil object - -
> the best way to see if this is correct or not is to put the debug(..) 
> inside the loop and see what it returns...
> 
> shai
Shai, I cant believe i missed that!  Thank you very much for responding.

Nate

-- 
Posted via http://www.ruby-forum.com/.

Anytime ;-)


Shai

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Posted via http://www.ruby-forum.com/.