On Friday, 22 June 2012 06:23:32 UTC+1, ydjango wrote: > > I have code as > > view_a(request): > .... Populate my_a, my_b and my_c... > try: > tp = TP.objects.get(a__exact = my_a, b__exact = my_b) > except TP.DoesNotExist, e: > tp = TP() > tp.a = my_a > tp.b = my_b > tp.c = my_c > tp.save() > else: > tp.c = my_c > tp.save() > > This view is called by ajax calls. TP is a django model and mysql db. > I am using django 1.1.4/ python2.5/mod_wsgi2.5, > > I find that in, one case, two rows with same value of a and b has been > created in DB. ( value of c was different) > What could have caused it? > > Any clues or hints on how to track down this problem or what to look for > will be appreciated. > > You probably have a race condition. You should use the built-in `get_or_create` manager method, which helps to minimize that sort of thing (it's not perfect, but it's better than coding it yourself). -- DR.
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