On Fri, May 15, 2009 at 12:11 PM, aa56280 <aa56...@gmail.com> wrote: > > So to be clear then, yes, I want to delete the object from the > database entirely. How to go about doing that using location_set? > > On May 15, 12:07 pm, Alex Gaynor <alex.gay...@gmail.com> wrote: > > On Fri, May 15, 2009 at 12:04 PM, aa56280 <aa56...@gmail.com> wrote: > > > > > I'm trying to wrap my head around why a ForeignKey needs to be set > > > with null=True in order for its related model to call remove() on one > > > of its instances. > > > > > For example: > > > > > # models > > > class Company(models.Model): > > > ... > > > class Location(models.Model): > > > ... > > > company= models.ForeignKey(Company) > > > > > # view > > > company = Company.objects.get(pk=1) > > > location = Location.objects.get(pk=1) > > > company.location_set.remove(location) # raises 'RelatedManager' > > > object has no attribute 'remove' > > > > > Any help is appreciated as I can't find much documentation on this. > > > > Because the way to remove an object from a related set is to set the > foreign > > key to None, so it no longer refers to it, however if the foreign key > isn't > > nullable the only option is to actually delete the object, which isn't > > exactly the same as what you specifified (since its destructive). > > > > Alex > > > > -- > > "I disapprove of what you say, but I will defend to the death your right > to > > say it." --Voltaire > > "The people's good is the highest law."--Cicero > > > You wouldn't do it using location_set, you could just do obj.delete() to delete it, then it will no longer be in location_set, since it doesn't exist in the DB at all :)
Alex -- "I disapprove of what you say, but I will defend to the death your right to say it." --Voltaire "The people's good is the highest law."--Cicero --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
