Array of Object Model

Question

I'm beginner with Django and I have problem to register model array of object from another class

Example:

class Trigger(models.Model):
   id = models.IntegerField()
   name = models.TextField()
   description = models.TextField()


class Host(models.Model):
   id = models.IntegerField()
   triggers = [] # <--- Array of Trigger instances here

How can I rewrite empty bracets to django model?

can a trigger belong to multiple hosts?

willeM_ Van Onsem
– willeM_ Van Onsem

2018-06-21 11:07:32 +00:00
Commented Jun 21, 2018 at 11:07 — willeM_ Van Onsem
– willeM_ Van Onsem, Commented Jun 21, 2018 at 11:07
One trigger (instance) can belong only to one host.

Santroy
– Santroy

2018-06-21 11:08:24 +00:00
Commented Jun 21, 2018 at 11:08 — Santroy
– Santroy, Commented Jun 21, 2018 at 11:08

willeM_ Van Onsem · Accepted Answer · 2018-06-21 11:11:37Z

1

You usually do that by adding a ForeignKey [django-doc] to a trigger that references to the Host, and then use as related_name= here 'triggers':

class Host(models.Model):
   id = models.IntegerField()

class Trigger(models.Model):
    id = models.IntegerField()
    name = models.TextField()
    description = models.TextField()
    host = ForeignKey(Host, on_delete=models.CASCADE, related_name='triggers')

Django will that add a reverse relation to Host. So you can then query somehost.triggers, which is a RelatedManager, to for example obtain .all(), elements, or .filter(..) these. So somehost.triggers.all() will result in a QuerySet that contains all Trigger objects with as host the somehost instance.

answered Jun 21, 2018 at 11:11

willeM_ Van Onsem

482k33 gold badges483 silver badges624 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Array of Object Model

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related