How to get the ID of the record just saved

Question

I\'m using Django 1.3 for one of my projects and I need to get the ID of a record just saved in the database.

I have something like the code below to save a record i

Answer 1

It would be n.pk.

To quote "Model.pk":

Regardless of whether you define a primary key field yourself, or let Django supply one for you, each model will have a property called pk. It behaves like a normal attribute on the model, but is actually an alias for whichever attribute is the primary key field for the model. You can read and set this value, just as you would for any other attribute, and it will update the correct field in the model.

Answer 2

Remove save() and get pk directly:

n = MyData.objects.create(record_title=title, record_content=content)
n.pk

Answer 3

The ID will be automatically updated in your model, so immediately after your n.save() line you can read n.id and it will be populated.

Answer 4

If someone reading this question the rest of the answers you still have problems accessing the id after the creation of the object. Be sure you don't define id as an Integer in your model. It is for free in Django so you can not write the id or use Autofield

#No
class TestModel(models.Model):
    id = models.IntegerField(primary_key=True)
    something...


#Ok
class TestModel(models.Model):
    id = models.AutoField(primary_key=True)
    something...

#Ok
class TestModel(models.Model):
    something...

if you do define id as Integer, TestModel.objects.create( or with save() will return None.

Answer 5

Use n.id after the save.

See "Auto-incrementing primary keys".

Answer 6

I had a similar issue with accessing the id. In Django 3.0.5, this is how I accessed the id. Using your example and variable name, see below:

instance = n.save()
# return the id
instance[0].id 

The variable 'instance' above is a list. Accessing id in the methods described above returns an AttributeError ("object has no attribute 'id'") in Django 3.

This answer applies when using modelformset_factory. This is true when creating a Form class from a Django model as described in the Django docs