CODEWITHSUNDEEP
pythondjangorelational-database
Tarikul Islam Rasel
Tarikul Islam Rasel

Reputation: 151

Check Dependency When Delete a object on Django

Here is the my code in model

class Role(models.Model):
    name_role = models.CharField(max_length=255)
    def __unicode__(self):
        return self.name_role
class UserProfile(models.Model):

      user = models.OneToOneField(User)


      role = models.ForeignKey(Role)
      create_by = models.IntegerField(null=True)
      create_date = models.DateTimeField(null=True)
      modified_by = models.IntegerField(null=True)
      modified_date= models.DateTimeField(null=True)
      status = models.IntegerField(default=1)

When A role will be deleted, I want to check if any UserProfile object is related to the role object. How can I do this?

Upvotes: 0

Views: 892

Answers (2)

itzMEonTV
itzMEonTV

Reputation: 20339

I think you are expecting this

role = Role.objects.get(name_role="rolename")
role.user_profile_set.all() #check if any before delete

Try this also 

role.userprofile_set.all()

Upvotes: 0

argaen
argaen

Reputation: 4245

You can do that by accessing the reverse ForeignKey field from Role. Something like:

if role_instance.userprofile_set.all():
   print "Care, role is related to userprofile instances"
else:
   print "You are safe to go"

Upvotes: 1

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