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Orderable model and admin

Project description

Make models orderable in the Admin.

Included:

  • Abstract base Model

  • Admin class

  • Inline admin class

  • Admin templates

Installation

Grab from the PyPI:

pip install django-orderable

Add to your INSTALLED_APPS:

...
'orderable',
...

Subclass the Orderable class:

from orderable.models import Orderable


class Book(Orderable):
    ...

Note: If your subclass of Orderable has a Metaclass then make sure it subclasses the Orderable one so the model is sorted by sort_order.

** Also Note:** Saving orderable models invokes a fair number of queries and in order to avoid race conditions should be run in a transaction. If you’re using django >= 1.6 we recommend you set DATABASES[‘default’][‘ATOMIC_REQUESTS’] = True in your settings, if you’re not yet on django 1.6, we recommend use of TransactionMiddleware.

Subclass the appropriate Orderable admin classes:

from orderable.admin import OrderableAdmin, OrderableTabularInline


class SomeInlineClass(OrderableTabularInline):
    ...

class SomeAdminClass(OrderableAdmin):
    list_display = ('__unicode__', 'sort_order_display')
    ...

jQuery and jQuery UI are used in the Admin for the actual moveable UI. You may override the versions with your own (rather than using the google cdn):

class SomeAdminClass(OrderableAdmin):
    class Media:
        js = (
            'path/to/jquery.js',
            'path/to/jquery.ui.js',
        )

Common Gotchas

Adding Orderable to Existing Models

You will need to populate the required sort_order field. Typically this is done by adding the field in one migration with a default of 0, then creating a data migration to set the value to that of its primary key:

for obj in orm['appname.Model'].objects.all():
    obj.sort_order = obj.pk
    obj.save()

Multiple Models using Orderable

When multiple models inherit from Orderable the next() and previous() methods will look for the next/previous model with a sort order. However you’ll likely want to have the various sort orders determined by a foreign key or some other predicate. The easiest way (currently) is to override the method in question.

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