after_save question

rubyonrails-talk
1

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

2

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