Metadata-Version: 2.1
Name: django-pghistory
Version: 2.9.0
Summary: History tracking for Django and Postgres
Home-page: https://github.com/Opus10/django-pghistory
License: BSD-3-Clause
Author: Wes Kendall
Requires-Python: >=3.8.0,<4
Classifier: Framework :: Django
Classifier: Framework :: Django :: 3.2
Classifier: Framework :: Django :: 4.0
Classifier: Framework :: Django :: 4.1
Classifier: Framework :: Django :: 4.2
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: BSD License
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: 3.9
Classifier: Programming Language :: Python :: 3.10
Classifier: Programming Language :: Python :: 3.11
Classifier: Programming Language :: Python :: 3 :: Only
Classifier: Programming Language :: Python :: 3.12
Requires-Dist: django (>=3)
Requires-Dist: django-pgtrigger (>=4.7.0)
Project-URL: Documentation, https://django-pghistory.readthedocs.io
Project-URL: Repository, https://github.com/Opus10/django-pghistory
Description-Content-Type: text/markdown

# django-pghistory

`django-pghistory` tracks changes to your Django models using [Postgres triggers](https://www.postgresql.org/docs/current/sql-createtrigger.html). It offers several advantages over other apps:

* No base models or managers to inherit, no signal handlers, and no custom save methods. All changes are reliably tracked, including bulk methods, with miniscule code.
* Snapshot all changes to your models, create conditional event trackers, or only track the fields you care about.
* Changes are stored in structured event tables that mirror your models. No JSON, and you can easily query events in your application.
* Changes can be grouped together with additional context attached, such as the logged-in user. The middleware can do this automatically.

`django-pghistory` has a number of ways in which you can configure tracking models for your application's needs and for performance and scale. An admin integration is included out of the box too.

## Quick Start

Decorate your model with `pghistory.track`. For example:

```python
import pghistory

@pghistory.track(pghistory.Snapshot())
class TrackedModel(models.Model):
    int_field = models.IntegerField()
    text_field = models.TextField()
```

Above we've registered a `pghistory.Snapshot` event tracker to `TrackedModel`. This event tracker stores every change in a dynamically-created model that mirrors fields in `TrackedModel`.

Run `python manage.py makemigrations` followed by `migrate` and *voila*, every change to `TrackedModel` is now stored. This includes bulk methods and even changes that happen in raw SQL. For example:

```python
from myapp.models import TrackedModel

# Even though we didn't declare TrackedModelEvent, django-pghistory
# creates it for us in our app
from myapp.models import TrackedModelEvent

m = TrackedModel.objects.create(int_field=1, text_field="hello")
m.int_field = 2
m.save()

print(TrackedModelEvent.objects.values("pgh_obj", "int_field"))

> [{'pgh_obj': 1, 'int_field': 1}, {'pgh_obj': 1, 'int_field': 2}]
```

Above we printed the `pgh_obj` field, which is a special foreign key to the tracked object. There are a few other special `pgh_` fields that we'll discuss later.

`django-pghistory` can track a subset of fields and conditionally store events based on specific field transitions. Users can also store free-form context from the application that's referenced by the event model, all with no additional database queries. See the next steps below on how to dive deeper and configure it for your use case.

## Compatibility

`django-pghistory` is compatible with Python 3.8 - 3.12, Django 3.2 - 4.2, Psycopg 2 - 3, and Postgres 12 - 16.

## Documentation

[View the django-pghistory docs here](https://django-pghistory.readthedocs.io/) to learn more about:

* The basics and terminology.
* Tracking historical events on models.
* Attaching dynamic application context to events.
* Configuring event models.
* Aggregating events across event models.
* The Django admin integration.
* Reverting models to previous versions.
* A guide on performance and scale.

There's also additional help, FAQ, and troubleshooting guides.

## Installation

Install `django-pghistory` with:

    pip3 install django-pghistory

After this, add `pghistory` and `pgtrigger` to the `INSTALLED_APPS` setting of your Django project.

## Contributing Guide

For information on setting up django-pghistory for development and contributing changes, view [CONTRIBUTING.md](CONTRIBUTING.md).

## Primary Authors

- [Wes Kendall](https://github.com/wesleykendall)

## Other Contributors

- @shivananda-sahu
- @asucrews
- @Azurency
- @dracos
- @adamchainz
- @eeriksp

