Rails - Jan 2005 - after_save, after_create, before_save etc... multiple times launching ...bug???

hi,

i have 2 tables (rooms & exams) linked by a intermediate table (has and
belongs
to many relation)


when an new exam is created i want it to be validated for every room

so inside exam model file i wrote:

before_create :linkeveryroom

private
def linkeveryroom
    self.rooms<<Room.find_all
end

(or something like that i''m not in front of my Mac)

it seems to work BUT the association is done 3 to 6 times (depends on what i use
after-save or after_create or even with before)...each linking is present
multiple times in the intermediate table (exams_rooms)

someone experiencing the same behaviours???


hangon

i forget one thing...i''m running on ruby 1.8.2, webrick , mysql 4.1.9
and macosx


Selon hangonsoft-GANU6spQydw@public.gmane.org:
>
> hi,
>
> i have 2 tables (rooms & exams) linked by a intermediate table (has and
> belongs
> to many relation)
>
>
> when an new exam is created i want it to be validated for every room
>
> so inside exam model file i wrote:
>
> before_create :linkeveryroom
>
> private
> def linkeveryroom
>     self.rooms<<Room.find_all
> end
>
> (or something like that i''m not in front of my Mac)
>
> it seems to work BUT the association is done 3 to 6 times (depends on what
i
> use
> after-save or after_create or even with before)...each linking is present
> multiple times in the intermediate table (exams_rooms)
>
> someone experiencing the same behaviours???
>
>
> hangon
> _______________________________________________
> Rails mailing list
> Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>

I had the same problem. Both on my laptop ruby 1.8.2 osx and on our
debian linux server. I''m sure it''s not connected to mysql
versions or
ruby versions, or os, as all three varried and the bug persisted.

I spent a while looking at it, and i couldn''t figure it out. When i
printed out the logs, and inserted breakpoints i could confirm that
the callback before_create is only being called once.

I think the problem lies somewhere in the order in which you call
things, and how if you push one object on to another, then save, it
can have unexpected side effects. Such as adding multiple times.

The below works, i''m busy with other things and had to stop looking in
to it once it got it working.

  def create_room

    if( self.rooms.size == 0 ) then
      room_data = {
        ''title'' => self.name,
        ''image_id'' => 1,
        ''description'' => self.name + "''s
room''"
      }
      
      room = Room.new( room_data )
      
      if room.save
        room.building<<(self)
      else
      	#more needs to go there
        logger.error("failed to create room for new building")
      end
      logger.info( self.rooms.inspect )
    end
  end



On Wed, 26 Jan 2005 18:05:55 +0100, hangonsoft-GANU6spQydw@public.gmane.org
<hangonsoft-GANU6spQydw@public.gmane.org> wrote:
> i forget one thing...i''m running on ruby 1.8.2, webrick , mysql
4.1.9 and macosx
> 
> Selon hangonsoft-GANU6spQydw@public.gmane.org:
> 
> >
> > hi,
> >
> > i have 2 tables (rooms & exams) linked by a intermediate table
(has and
> > belongs
> > to many relation)
> >
> >
> > when an new exam is created i want it to be validated for every room
> >
> > so inside exam model file i wrote:
> >
> > before_create :linkeveryroom
> >
> > private
> > def linkeveryroom
> >     self.rooms<<Room.find_all
> > end
> >
> > (or something like that i''m not in front of my Mac)
> >
> > it seems to work BUT the association is done 3 to 6 times (depends on
what i
> > use
> > after-save or after_create or even with before)...each linking is
present
> > multiple times in the intermediate table (exams_rooms)
> >
> > someone experiencing the same behaviours???
> >
> >
> > hangon
> > _______________________________________________
> > Rails mailing list
> > Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> > http://lists.rubyonrails.org/mailman/listinfo/rails
> >
> 
> _______________________________________________
> Rails mailing list
> Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>