django-stagers 0.0.9

This package adds stagers to assist in bulk operations on django models.

Django Stagers

This package provides a class Stager to stage model instances for bulk creation, update, or deletion at a later time. That way, you can focus on writing sync logic without worrying about keeping track of model instances or their unique identifiers.

Installation

Install using pip:

pip install django-stagers

Import the Stager class:

from django_stagers import Stager

Usage

Instantiate a Stager class (optionally with a type for better type-hinting) and then call the create() function to add models. When any of the three staging methods create(), delete() or update() are called, though, the corresponding action is not actually taken in the database until the user calls commit(), at which point all of the staged actions are run in bulk fashion.

from django_stagers import Stager

foo_stager = Stager[Foo](queryset=Foo.objects.all(), key="id")

foo_stager.create(Foo(attr="abc"))
foo_stager.create(Foo(attr="def"))
...

foo_stager.commit()

The output of the operation will look something like this:

Sat Nov 2 2024 2:36:37 PM [INFO    ]: Committing staged Foo instances.
Sat Nov 2 2024 2:36:37 PM [INFO    ]: Created     37 Foo instances.

Access Existing Instances

Another key feature of stagers is that they keep track of existing model instances in the database using the existing attribute. This way, it is easy to check whether a new object is already tracked in the django database or has already been staged previously.

for serialized_foo in serialized_foos:
  if existing_foo := foo_stager.existing.get(serialized_foo['key']):
    foo_stager.update(serialized_foo['key'], 'attr', serialized_foo['attr'])
  else:
    foo_stager.create(Foo(**serialized_foo))
...

foo_stager.commit()