django-field-history 0.2.0

A Django app to track changes to a model field.

A Django app to track changes to a model field.

Documentation

The full documentation is at https://django-field-history.readthedocs.org.

Quickstart

Install django-field-history:

pip install django-field-history

Be sure to put it in INSTALLED_APPS.

INSTALLED_APPS = [
    'field_history',
]

Then add it to your models.

from field_history.tracker import FieldHistoryTracker

class PizzaOrder(models.Model):
    INVOICE_NUMBER_TYPE = (
        ('ORDER', 'Ordered'),
        ('COOK', 'Cooking'),
        ('COMPL', 'Complete'),
    )
    status = models.CharField(max_length=10, choices=PIZZA_CHOICES)

    field_history = FieldHistoryTracker(['status'])

Now each time you change the order’s status field information about that change will be stored in the database.

from field_history.models import FieldHistory

# No FieldHistory objects yet
assert FieldHistory.objects.count() == 0

# Creating an object will make one
pizza_order = PizzaOrder.objects.create(status='ORDER')
assert FieldHistory.objects.count() == 1

# This object has some fields on it
history = FieldHistory.objects.get()
assert history.object == pizza_order
assert history.field_name == 'status'
assert history.field_value == 'ORDER'
assert history.date_created is not None

# Updating that particular field creates a new FieldHistory
pizza_order.status = 'COOK'
pizza_order.save()
assert FieldHistory.objects.count() == 2

# You can query FieldHistory objects this way
histories = FieldHistory.objects.get_for_model_and_field(pizza_order, 'status')
assert list(pizza_order.field_history) == list(histories)

# Or using the get_{field_name}_history() method added to your model
self.assertItemsEqual([pizza_order.get_status_history()], [histories])

updated_history = histories.order_by('-date_created').first()
assert history.object == pizza_order
assert history.field_name == 'status'
assert history.field_value == 'COOK'
assert history.date_created is not None

Features

• Keeps a history of all changes to a particular field.

• Stores the field’s name, value, date and time of change.

• Works with all model field types (except ManyToManyField).

Running Tests

Does the code actually work?

source <YOURVIRTUALENV>/bin/activate
(myenv) $ pip install -r requirements-test.txt
(myenv) $ python runtests.py

History

0.2.0 (2016-02-17)

• First release on PyPI.