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django-reversion-compare 0.5.1

history compare for django-reversion

django-reversion-compare is an extension to django-reversion that provides a history compare view to compare two versions of a model which is under reversion.

Comparing model versions is not a easy task. Maybe there are different view how this should looks like. This project will gives you a generic way to see whats has been changed.

Many parts are customizable by overwrite methods or subclassing, see above.


  • Django 1.7.x
  • django-tools (only for running the unittests!)


Just use:

pip install django-reversion-compare

Optional you can install google-diff-match-patch otherwise difflib would be used. The easiest way it to use the unofficial package diff-match-patch, e.g.:

pip install diff-match-patch


Add reversion_compare to INSTALLED_APPS in your, e.g.:

    'reversion', #
    'reversion_compare', #

# Add reversion models to admin interface:


Inherit from CompareVersionAdmin instead of VersionAdmin to get the compare feature. e.g.:

from django.contrib import admin
from reversion_compare.admin import CompareVersionAdmin

from my_app.models import ExampleModel

class ExampleModelAdmin(CompareVersionAdmin):
    pass, ExampleModelAdmin)

If you’re using an existing third party app, then you can add patch django-reversion-compare into its admin class by using the reversion_compare.helpers.patch_admin() method. For example, to add version control to the built-in User model:

from reversion_compare.helpers import patch_admin


e.g.: Add django-cms Page model:

from cms.models.pagemodel import Page
from reversion_compare.helpers import patch_admin

# Patch django-cms Page Model to add reversion-compare functionality:


It’s possible to change the look for every field or for a entire field type. You must only define a methods to your admin class with this name scheme:

  • "compare_%s" % field_name
  • "compare_%s" % field.get_internal_type()

If there exist no method with this name scheme, the fallback_compare() method would be used.

example for specify a compare method for a model field by name:

class YourAdmin(CompareVersionAdmin):
    def compare_foo_bar(self, obj_compare):
        """ compare the foo_bar model field """
        return "%r <-> %r" % (obj_compare.value1, obj_compare.value2)

and example using patch_admin with custom version admin class:

patch_admin(User, AdminClass=YourAdmin)


Here some screenshots of django-reversion-compare:

How to select the versions to compare:

from v0.1.0: DateTimeField compare (last update), TextField compare (content) with small changes and a ForeignKey compare (child model instance was added):

from v0.1.0: Same as above, but the are more lines changed in TextField and the ForeignKey relation was removed:

Example screenshot from v0.3.0: a many-to-many field compare (friends, hobbies):

  • In the first line, the m2m object has been changed.
  • line 2: A m2m object was deleted
  • line 3: A m2m object was removed from this entry (but not deleted)
  • line 4: This m2m object has not changed


run unittests


$ cd path/to/django-reversion-compare
django-reversion-compare$ ./ test


$ cd path/to/django-reversion-compare
django-reversion-compare$ ./

Helpfull for writing and debugging unittests is to run a local test server with the same data. e.g.:

~$ cd path/to/django-reversion-compare/
/django-reversion-compare$ ./tests/ run_testserver

migration will be run and a superuser will be created. Username: test Password: 12345678

Version compatibility

Reversion-Compare Django
>=v0.4 v1.7
<v0.4 v1.4

(These are the unittests variants. Maybe other versions are compatible, too.)


  • v0.5.1 - 28.02.2015:

    • activate previous/next links and add unitests for them
  • v0.5.0 - 27.02.2015:

    • refactory unittests, test with Django v1.7 and Python 2.7 & 3.4
  • v0.4.0 - 02.02.2015:

    • Updates for django 1.7 support
    • Add settings.ADD_REVERSION_ADMIN
  • v0.3.5 - 03.01.2013:

    • Remove date from version string. issues 9
  • v0.3.4 - 20.06.2012:

    • Use VersionAdmin.revision_manager rather than default_revision_manager, contributed by Mark Lavin - see: pull request 7
    • Use logging for all debug prints, contributed by Bojan Mihelac - see: pull request 8
  • v0.3.3 - 11.06.2012:

    • Bugfix “ValueError: zero length field name in format” with Python 2.6 issues 5
  • v0.3.2 - 04.06.2012:

  • v0.3.1 - 01.06.2012:

    • Bugfix: force unicode in html diff
    • Bugfix in unittests
  • v0.3.0 - 16.05.2012:

    • Enhanced handling of m2m changes with follow and non-follow relations.
  • v0.2.2 - 15.05.2012:

    • Compare many-to-many in the right way.
  • v0.2.1 - 10.05.2012:

  • v0.2.0 - 09.05.2012:

    • many-to-many compare works, too.
  • v0.1.0 - 08.05.2012:

    • First release
  • v0.0.1 - 08.05.2012:

File Type Py Version Uploaded on Size
django-reversion-compare-0.5.1.tar.gz (md5) Source 2015-02-28 199KB
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