mohan wrote: > Hi, > > I have the following 3 models with one model having a foreign key > reference to another model. > > class DeliveryBatch(models.Model): > delivered_to = models.ForeignKey(Centre) > ... > > class Centre(models.Model): > is_deleted = models.BooleanField(default=false) > ... > > class CentreLog(models.Model): > """contains all attributes of Centre together with > last_modified_time, user and corresponding action.""" > ... > > The problem is, a Centre referred to by a DeliveryBatch may get deleted > in the future. Then the foreign key reference of the DeliveryBatch gets > invalid. Django even goes a step further and deletes the corresponding > DeliveryBatch. But this is undesirable.
The usual approach is to set delivered_to to NULL (or, None) before deleting it. Michael --~--~---------~--~----~------------~-------~--~----~ 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 [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/django-users -~----------~----~----~----~------~----~------~--~---
