django-reversion-compare 0.2.0.beta.0509

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.

installation

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

setup

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

INSTALLED_APPS = (
    'django...',
    ...
    'reversion', # https://github.com/etianen/django-reversion
    'reversion_compare', # https://github.com/jedie/django-reversion-compare
    ...
)

usage

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

admin.py e.g.:

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

from my_app.models import ExampleModel

class ExampleModelAdmin(CompareVersionAdmin):
    pass

admin.site.register(ExampleModel, ExampleModelAdmin)

customize

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)

test

We ship a simple test project. To use this, do this steps:

$ cd path/to/django-reversion-compare/reversion_compare_test_project/
django-reversion-compare/reversion_compare_test_project$ ./reset.sh # creates test.db3 with syncdb and run createsuperuser
django-reversion-compare/reversion_compare_test_project$ ./manage.py runserver --traceback

See, also: reversion_compare_test_project

screenshots

Here some screenshots of django-reversion-compare:

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How to select the versions to compare:

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

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

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Example screenshot from v0.2.0: One simple CharField compare (name) and two many-to-many field compare (friends, hobbies):

changelog

• 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:

  • collect all compare stuff from old “diff” branch

  • see also: https://github.com/etianen/django-reversion/issues/147

Links

IRC	#pylucid on freenode.net
Github	http://github.com/jedie/django-reversion-compare
Python Packages	http://pypi.python.org/pypi/django-reversion-compare/