Work in progress on refactoring the Sortable class into a non-obtrusive mixin.

sample_project/app/models.py

@@ -4,7 +4,7 @@ from django.db import models
 from django.utils.encoding import python_2_unicode_compatible
 
 from adminsortable.fields import SortableForeignKey
-from adminsortable.models import Sortable
+from adminsortable.models import Sortable, SortableMixin
 
 
 @python_2_unicode_compatible
@@ -19,59 +19,65 @@ class SimpleModel(models.Model):
 
 
 # A model that is sortable
-class Category(SimpleModel, Sortable):
-    class Meta(Sortable.Meta):
-        """
-        Classes that inherit from Sortable must define an inner
-        Meta class that inherits from Sortable.Meta or ordering
-        won't work as expected
-        """
+class Category(SimpleModel, SortableMixin):
+    class Meta:
         verbose_name_plural = 'Categories'
+        ordering = ['order']
+
+    order = models.PositiveIntegerField(default=0, editable=False)
 
 
 # A model with an override of its queryset for admin
 @python_2_unicode_compatible
-class Widget(SimpleModel, Sortable):
-    class Meta(Sortable.Meta):
-        pass
+class Widget(SimpleModel, SortableMixin):
+    class Meta:
+        ordering = ['order']
 
     def __str__(self):
         return self.title
 
+    order = models.PositiveIntegerField(default=0, editable=False)
+
 
 # A model that is sortable relative to a foreign key that is also sortable
 # uses SortableForeignKey field. Works with versions 1.3+
-class Project(SimpleModel, Sortable):
-    class Meta(Sortable.Meta):
-        pass
+class Project(SimpleModel, SortableMixin):
+    class Meta:
+        ordering = ['order']
 
     category = SortableForeignKey(Category)
     description = models.TextField()
 
+    order = models.PositiveIntegerField(default=0, editable=False)
+
 
 # Registered as a tabular inline on `Project`
 @python_2_unicode_compatible
-class Credit(Sortable):
-    class Meta(Sortable.Meta):
-        pass
+class Credit(SortableMixin):
+    class Meta:
+        ordering = ['order']
 
     project = models.ForeignKey(Project)
     first_name = models.CharField(max_length=30)
     last_name = models.CharField(max_length=30)
 
+    order = models.PositiveIntegerField(default=0, editable=False)
+
     def __str__(self):
         return '{0} {1}'.format(self.first_name, self.last_name)
 
 
 # Registered as a stacked inline on `Project`
 @python_2_unicode_compatible
-class Note(Sortable):
-    class Meta(Sortable.Meta):
-        pass
+class Note(SortableMixin):
+    class Meta:
+        ordering = ['order']
 
     project = models.ForeignKey(Project)
     text = models.CharField(max_length=100)
 
+    order = models.PositiveIntegerField(default=0, editable=False)
+
     def __str__(self):
         return self.text
 
@@ -99,15 +105,17 @@ class NonSortableNote(models.Model):
 
 # A generic bound model
 @python_2_unicode_compatible
-class GenericNote(SimpleModel, Sortable):
+class GenericNote(SimpleModel, SortableMixin):
     content_type = models.ForeignKey(ContentType,
         verbose_name=u"Content type", related_name="generic_notes")
     object_id = models.PositiveIntegerField(u"Content id")
     content_object = generic.GenericForeignKey(ct_field='content_type',
         fk_field='object_id')
 
-    class Meta(Sortable.Meta):
-        pass
+    order = models.PositiveIntegerField(default=0, editable=False)
+
+    class Meta:
+        ordering = ['order']
 
     def __str__(self):
         return u'{0}: {1}'.format(self.title, self.content_object)
@@ -115,25 +123,30 @@ class GenericNote(SimpleModel, Sortable):
 
 # An model registered as an inline that has a custom queryset
 @python_2_unicode_compatible
-class Component(SimpleModel, Sortable):
-    class Meta(Sortable.Meta):
-        pass
+class Component(SimpleModel, SortableMixin):
+    class Meta:
+        ordering = ['order']
 
     widget = SortableForeignKey(Widget)
 
+    order = models.PositiveIntegerField(default=0, editable=False)
+
     def __str__(self):
         return self.title
 
 
 @python_2_unicode_compatible
-class Person(Sortable):
-    class Meta(Sortable.Meta):
+class Person(SortableMixin):
+    class Meta:
+        ordering = ['order']
         verbose_name_plural = 'People'
 
     first_name = models.CharField(max_length=50)
     last_name = models.CharField(max_length=50)
     is_board_member = models.BooleanField('Board Member', default=False)
 
+    order = models.PositiveIntegerField(default=0, editable=False)
+
     # Sorting Filters allow you to set up sub-sets of objects that need
     # to have independent sorting. They are listed in order, from left
     # to right in the sorting change list. You can use any standard
@@ -158,26 +171,32 @@ class NonSortableCategory(SimpleModel):
 
 
 @python_2_unicode_compatible
-class SortableCategoryWidget(SimpleModel, Sortable):
-    class Meta(Sortable.Meta):
+class SortableCategoryWidget(SimpleModel, SortableMixin):
+    class Meta:
+        ordering = ['order']
         verbose_name = 'Sortable Category Widget'
         verbose_name_plural = 'Sortable Category Widgets'
 
     non_sortable_category = SortableForeignKey(NonSortableCategory)
 
+    order = models.PositiveIntegerField(default=0, editable=False)
+
     def __str__(self):
         return self.title
 
 
 @python_2_unicode_compatible
-class SortableNonInlineCategory(SimpleModel, Sortable):
+class SortableNonInlineCategory(SimpleModel, SortableMixin):
     """Example of a model that is sortable, but has a SortableForeignKey
     that is *not* sortable, and is also not defined as an inline of the
     SortableForeignKey field."""
 
     non_sortable_category = SortableForeignKey(NonSortableCategory)
 
-    class Meta(Sortable.Meta):
+    order = models.PositiveIntegerField(default=0, editable=False)
+
+    class Meta:
+        ordering = ['order']
         verbose_name = 'Sortable Non-Inline Category'
         verbose_name_plural = 'Sortable Non-Inline Categories'
 

sample_project/app/tests.py

@@ -10,14 +10,19 @@ from django.db import models
 from django.test import TestCase
 from django.test.client import Client
 
-from adminsortable.models import Sortable
+from adminsortable.models import SortableMixin
 from adminsortable.utils import get_is_sortable
 from app.models import Category, Person, Project
 
 
-class TestSortableModel(Sortable):
+class TestSortableModel(SortableMixin):
     title = models.CharField(max_length=100)
 
+    order = models.PositiveIntegerField(default=0, editable=False)
+
+    class Meta:
+        ordering = ['order']
+
     def __unicode__(self):
         return self.title