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a guest Aug 10th, 2018 66 Never
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  1. Django, auto setting a field during a save, based on other Admin page inputs
  2. class Suffix(models.Mode):
  3.     suffix = models.CharField(max_length=255)
  4.     def __unicode__(self):
  5.         return u'%s'%(self.suffix)
  6.  
  7. class Person(models.Model):
  8.     first_name= models.CharField(max_length=255)
  9.     last_name= models.CharField(max_length=255)
  10.     suffixes= models.ManyToManyField(Suffix, blank=True, null=True)
  11.     full_name= models.CharField(max_length=255)
  12.  
  13. class SuperPerson(Person):
  14.     ignore_this_field= model.CharField(max_length=255)
  15.    
  16. def save(self, *args, **kwargs):
  17.     # Attempt to get data into the database so I can access it
  18.     super(SuperPerson,self).save(*args,**kwargs)
  19.  
  20.     self.full_name = self.first_name + self.last_name
  21.     for suf in self.suffixes.all():
  22.         self.full_name+= suf.__unicode__()
  23.  
  24.     # Now save the copy with full_name set as I wish
  25.     super(SuperPerson,self).save(*args,**kwargs)
  26.    
  27. @receiver(pre_save, sender=SuperPerson)
  28. def set_full_name(sender, instance, **kwargs):
  29.     instance.full_name = instance.first_name + instance.last_name
  30.  
  31.     for suf in instance.suffixes.all():
  32.         instance.full_name+= ', ' + suf.__unicode__()
  33.    
  34. @receiver(m2m_changed, sender=Person.suffixes.through)
  35. def set_full_name_after_ManyToMany_saved(sender, instance, **kwargs):
  36.     instance.full_name = instance.first_name + instance.last_name
  37.     for suf in instance.suffixes.all():
  38.         instance.full_name+= ', ' + suf.__unicode__()
  39.     print 'Saving As', instance.full_name
  40.     instance.save()
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