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track when an object was created or changed and allow querying based on time and versioning (w/ django-reversion support)
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track when an object was created or changed and allow querying based on time and versioning (w/ django-reversion support)

HandleRefModel as a base for all your models

from django.db import models
from django_handleref.models import HandleRefModel

class Test(HandleRefModel):
    name = models.CharField(max_length=255)

Querying for modification since

It is now possible for you to see which instances of a model have been created or modified since a specific time or version

import time

# create instance
test = Test.objects.create(name="This is a test")

# keep track of time, we need this later
t = time.time()

# modifying and saving it = "Changed my mind"

# now we can use the handleref manager to retrieve it
Test.handleref.since(timestamp=t).count() # 1
Test.handleref.since(timestamp=time.time().count() #0

Soft delete

By default all models extending HandleRefModel will softdelete when their delete() method is called. Note that this currently wont work for batch deletes - as this does not call the delete() method.

test = Test.objects.get(id=1)

# querying handleref undeleted will not contain the deleted object
Test.handleref.undeleted().filter(id=1).count() #0

# querying handleref since will not contain the deleted object
Test.handleref.since(timestamp=t).filter(id=1).count() #0

# passing deleted=True to handleref since will contain the deleted object
Test.handleref.since(timestamp=t, deleted=True).filter(id=1).count() #1

# querying using the standard objects manager will contain the deleted object
Test.objects.filter(id=1).count() #1

# You may also still hard-delete by passing hard=True to delete
Test.objects.filter(id=1).count() #0

Versioning (with django-reversion)



When django-reversion is installed all your HandleRefModels will be valid for versioning.

import reversion

with reversion.create_revision():
    obj = Test.objects.create(name="This is a test")

    obj.version #1 = "Changed my mind"

    obj.version #2

Test.handleref.since(version=1).count() #1


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