pk is not necessarily id, in any case if you are the one adding it then you already know that the object didn't come from the db, in order to check that later I would add an attribute to the object and check it's presence, if not present it means it came from the db.
On Tue, Jan 21, 2014 at 11:55 AM, Johannes Schneider < johannes.schnei...@galileo-press.de> wrote: > yes, but the problem is that we manually give them a pk. > > Maye it's the best to reduce the question to the following: > Which (undocumented) field is better for this case? > * instance._state.db (checking if this is None) > * instance_state.adding (checking for True) > > bg, > Johannes > > > > On 21.01.2014 10:07, Avraham Serour wrote: > >> wouldn't checking for the presence of an id enough? as far as I know >> instantiated objects don't have id's >> >> >> On Tue, Jan 21, 2014 at 10:16 AM, Erik Cederstrand >> <erik+li...@cederstrand.dk <mailto:erik+li...@cederstrand.dk>> wrote: >> >> Den 21/01/2014 kl. 08.58 skrev Johannes Schneider >> <johannes.schnei...@galileo-press.de >> <mailto:johannes.schnei...@galileo-press.de>>: >> >> >> > maybe I I formulated it not precise enough. >> > I need to check if some instance of a model comes from some >> database query (e.g. via get(..)) or is instanciated 'by hand'. and >> not jet written to the database. >> > In this case I don't need to know, if there is an related object >> (e.g. with the same pk or same values for its attributes) in the >> database. >> >> Okay. Sounds like your best bet is to either roll your own, or use >> the undocumented API as suggested by Tom Evans. >> >> Either way, make sure to write tests so this doesn’t break when you >> upgrade Django. >> >> Erik >> >> -- >> You received this message because you are subscribed to the Google >> Groups "Django users" group. >> To unsubscribe from this group and stop receiving emails from it, >> send an email to django-users+unsubscr...@googlegroups.com >> <mailto:django-users%2bunsubscr...@googlegroups.com>. >> >> To post to this group, send email to django-users@googlegroups.com >> <mailto:django-users@googlegroups.com>. >> >> Visit this group at http://groups.google.com/group/django-users. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/django-users/78B3DC94- >> CBFC-4F38-A35C-73F54CAB572A%40cederstrand.dk. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> -- >> You received this message because you are subscribed to the Google >> Groups "Django users" group. >> To unsubscribe from this group and stop receiving emails from it, send >> an email to django-users+unsubscr...@googlegroups.com. >> To post to this group, send email to django-users@googlegroups.com. >> Visit this group at http://groups.google.com/group/django-users. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/django-users/CAFWa6t% >> 2Brm9REWaWUTqZHd4Wv3Pw212RLGSh89%2BWJwC7NFNM%3DqQ%40mail.gmail.com. >> >> For more options, visit https://groups.google.com/groups/opt_out. >> > > > -- > Johannes Schneider > Webentwicklung > johannes.schnei...@galileo-press.de > Tel.: +49.228.42150.xxx > > Galileo Press GmbH > Rheinwerkallee 4 - 53227 Bonn - Germany > Tel.: +49.228.42.150.0 (Zentrale) .77 (Fax) > http://www.galileo-press.de/ > > Geschäftsführer: Tomas Wehren, Ralf Kaulisch, Rainer Kaltenecker > HRB 8363 Amtsgericht Bonn > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to django-users+unsubscr...@googlegroups.com. > To post to this group, send email to django-users@googlegroups.com. > Visit this group at http://groups.google.com/group/django-users. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/django-users/52DE442B.1010300%40galileo-press.de. > > For more options, visit https://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at http://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/CAFWa6t%2BNnHb94_vNdFoKv8bsv_cF3pzxt2MpuftKir5WcV67rA%40mail.gmail.com. For more options, visit https://groups.google.com/groups/opt_out.
