Tuesday, November 25, 2014

Foreign Key Deletion Problem

Dear Django Users,    I have been running into a problem with the app I am developing and I  haven't been able to find a good solution. Suppose I have the following  model:    class MyModel(models.Model):      a = models.CharField(max_length=255, null=True, blank=True)      b = models.ForeignKey('MyOtherModel', null=True, blank=True,  on_delete=models.SET_NULL)      # some more model fields    The task I am trying to accomplish is the following: If an instance of  "MyOtherModel" is deleted, a and b of the related MyModel-instance  should be set to NULL in the database, but the instance of MyModel with  the other fields should remain. The model above only sets b to NULL but  not a.    Any ideas?    Regards,    Jann

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