Rails - Sep 2010 - Problem With Active Record. Associations Showing Error ..ple

i am stuck somewhere with The Acrive record association .
whenever i try to get the value from another table it gives me the
foolowing error
"undefined method `journal_name'' for nil:NilClass"

MY Controller

def index
@ledgers      =  Ledger.find(:all)
@finaccounts  =  Finaccount.find(:all)
@journels     =  Journel.all
respond_to do |format|
format.html
format.pdf { render :layout => false }
end

view:

    <td><%=h ledger.journel.journal_name %></td>


Models :
 1) Journel

class Journel < ActiveRecord::Base
has_many :ledgers
end

2)

class Ledger < ActiveRecord::Base
belongs_to :journel
end
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Apparently one or more of your ledgers doesn''t have a journel?

Try:
<td><%=h ledger.journel.journal_name if ledger.journel %></td>
to see the ones that don''t have journels.
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Thanks For the Help  Heinz Strunk.
But i need To Know Is there anything with rails 2.3.5 because to check 
wheather i have made any mistake in my application i created a sample 
application , and again it was the same error  i got .
waiting for your reply
and one more thing ..i am only a couple of months old to Ruby On rails 
.so please if possible suggest me how to make the associations between 
tables in rails.
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If you are much interested in Rails Associations means, refer these 
URLs.

http://guides.rubyonrails.org/association_basics.html
http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html

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Regards,

T.Veerasundaravel.
http://tinyurl.com/25vma7h
@veerasundaravel


Sudhir Vishwakarma wrote:
> Thanks For the Help  Heinz Strunk.
> But i need To Know Is there anything with rails 2.3.5 because to check 
> wheather i have made any mistake in my application i created a sample 
> application , and again it was the same error  i got .
> waiting for your reply
> and one more thing ..i am only a couple of months old to Ruby On rails 
> .so please if possible suggest me how to make the associations between 
> tables in rails.
-- 
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Sorry But I guess I have read all The Associations ..the only thing i 
want to know is there any problem with rails 2.3.5 because when i make 
the associations in 2.3.5 i get the same error
undefined method `some method'' for nil:NilClass"



Veera Sundaravel wrote:
> If you are much interested in Rails Associations means, refer these 
> URLs.
> 
> http://guides.rubyonrails.org/association_basics.html
>
http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html
> 
> --
> Regards,
> 
> T.Veerasundaravel.
> http://tinyurl.com/25vma7h
> @veerasundaravel
> 
> 
> Sudhir Vishwakarma wrote:
>> Thanks For the Help  Heinz Strunk.
>> But i need To Know Is there anything with rails 2.3.5 because to check 
>> wheather i have made any mistake in my application i created a sample 
>> application , and again it was the same error  i got .
>> waiting for your reply
>> and one more thing ..i am only a couple of months old to Ruby On rails 
>> .so please if possible suggest me how to make the associations between 
>> tables in rails.
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On Sep 17, 11:01 am, Sudhir Vishwakarma
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:
> Sorry But I guess I have read all The Associations ..the only thing i
> want to know is there any problem with rails 2.3.5 because when i make
> the associations in 2.3.5 i get the same error
> undefined method `some method'' for nil:NilClass"
>
 Unlikely. As Heinz said, the most likely explanation is that some of
your ledgers don''t have a journel.

Fred
>
>
>
>
> Veera Sundaravel wrote:
> > If you are much interested in Rails Associations means, refer these
> > URLs.
>
> >http://guides.rubyonrails.org/association_basics.html
>
>http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMet...
>
> > --
> > Regards,
>
> > T.Veerasundaravel.
> >http://tinyurl.com/25vma7h
> > @veerasundaravel
>
> > Sudhir Vishwakarma wrote:
> >> Thanks For the Help  Heinz Strunk.
> >> But i need To Know Is there anything with rails 2.3.5 because to
check
> >> wheather i have made any mistake in my application i created a
sample
> >> application , and again it was the same error  i got .
> >> waiting for your reply
> >> and one more thing ..i am only a couple of months old to Ruby On
rails
> >> .so please if possible suggest me how to make the associations
between
> >> tables in rails.
>
> --
> Posted viahttp://www.ruby-forum.com/.
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On Fri, Sep 17, 2010 at 3:31 PM, Sudhir Vishwakarma
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>wrote:
> Sorry But I guess I have read all The Associations ..the only thing i
> want to know is there any problem with rails 2.3.5 because when i make
> the associations in 2.3.5 i get the same error
> undefined method `some method'' for nil:NilClass"
>
>
You can use "rails console" to start up the RAILS console and look up
the
values of various objects and make a decision why you are getting null.
Most probable reason why you are getting null is that "journel_id"
value is
not set in Ledger records.

In RAILS console, do:
> Ledger.first
...observe the field values..., look wheher journel_id has valid integer
> Ledger.first.journel
...if you get null, then, journel_id is not correct.  try to set it to a
valid jourenl
> lg = Ledger.first
> lg.journel = Journel.first
> lg.save!
> Ledger.first.jourenl
.....now you should not see null...




>
> Veera Sundaravel wrote:
> > If you are much interested in Rails Associations means, refer these
> > URLs.
> >
> > http://guides.rubyonrails.org/association_basics.html
> >
>
http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html
> >
> > --
> > Regards,
> >
> > T.Veerasundaravel.
> > http://tinyurl.com/25vma7h
> > @veerasundaravel
> >
> >
> > Sudhir Vishwakarma wrote:
> >> Thanks For the Help  Heinz Strunk.
> >> But i need To Know Is there anything with rails 2.3.5 because to
check
> >> wheather i have made any mistake in my application i created a
sample
> >> application , and again it was the same error  i got .
> >> waiting for your reply
> >> and one more thing ..i am only a couple of months old to Ruby On
rails
> >> .so please if possible suggest me how to make the associations
between
> >> tables in rails.
>
> --
> Posted via http://www.ruby-forum.com/.
>
> --
> You received this message because you are subscribed to the Google Groups
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>
>

-- 
Srikanth Shreenivas
http://www.srikanthps.com
@srikanthps

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I doubt there''s a problem with Rails 2.3.5

Fire up the console and try following:
ledger = Ledger.first
ledger.journel = Journel.first
ledger.journel.journal_name

This should work and if so the ledgers you''re calling in the view just 
doesn''t have a journel. If not something''s wrong with the
whole thing :)
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