Rails - Jul 2007 - after_save question

Hi all,

In my model class I need to update an attribute with the ID of the record
right after the model object has been saved.
I intended to use the after_save callback for this purpose.

I don''t know how to update this automatically after saving an object.
Calling save in the after_save hook, causes an infinite loop.
Write_attribute does not save to the Database. What can I do, to make this
happen auto-magically?

class Product < ActiveRecord::Base

  after_save :update_lineage

  def update_lineage
     write_attribute(:lineage, "#{id},") # this does not save the
attribute
to the db
     # save! # this does save, but calls the after_save callback again,
causing a infinite loop
  end

end

Thanks,

Harm de Laat

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Hi Harm,
> class Product < ActiveRecord::Base
> 
-after_save :update_lineage
+after_create :update_lineage
> 
>   def update_lineage
-      write_attribute(:lineage, "#{id},") # this does not save the
- attribute to the db
-      # save! # this does save, but calls the after_save callback again,
- causing a infinite loop
+ update_attribute :lineage, "#{id},"
>   end
> 
> end
> 
Regards
Florian

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