Refonte de la base:

* utilisation de classes abstraites Django : Item et Collection
  * héritage de ces classes pour Game et Console
  * création d'un objet Timeline contenant le changement d'état des jeux
  * affichage de la Timeline sur l'interface Admin

collection/core/apps.py

@@ -0,0 +1,6 @@
+from django.apps import AppConfig
+
+
+class CoreConfig(AppConfig):
+    name = 'core'
+

collection/core/models.py

@@ -0,0 +1,86 @@
+from datetime import datetime
+from django.db import models
+from django.utils.translation import ugettext as _
+
+
+class Collection(models.Model):
+    name = models.CharField(max_length=255)
+
+    def __str__(self):
+        return '%s' % self.name
+
+    class Meta:
+        abstract = True
+        ordering = ['name']
+
+
+class Item(models.Model):
+    TARGET_MODEL = None
+    TARGET_VERBOSE_NAME = None
+
+    # status choices
+    CREATED = 'created'
+    STATUS_CHOICES = (
+        (CREATED, _('New')),
+    )
+    DEFAULT_CHOICE = CREATED
+
+    name = models.CharField(max_length=255)
+
+    def __str__(self):
+        return '%s' % self.name
+
+    @classmethod
+    def on_class_prepared(cls):
+        """
+        Add new field 'collection' which is a link to TARGET_MODEL.
+        Add new field 'status' which is a list of choices. With CREATED.
+        """
+        target_field = models.ForeignKey(
+            cls.TARGET_MODEL,
+            related_name=cls.RELATED_TARGET_NAME,
+            verbose_name=cls.TARGET_VERBOSE_NAME)
+        target_field.contribute_to_class(cls, 'collection')
+        status_field = models.CharField(
+            max_length=30,
+            choices=Item.STATUS_CHOICES + cls.STATUS_CHOICES,
+            default=cls.DEFAULT_CHOICE)
+        status_field.contribute_to_class(cls, 'status')
+
+    class Meta:
+        abstract = True
+        ordering = ['name']
+
+
+class Timeline(models.Model):
+    """
+    Keep changes on collection.
+    For an example, a game cretion date. Or when you completed a game.
+    """
+    TARGET_MODEL = None
+    STATUS_CHOICES = Item.STATUS_CHOICES
+    DEFAULT_CHOICE = Item.CREATED
+    date = models.DateTimeField(default=datetime.now)
+
+    @classmethod
+    def on_class_prepared(cls):
+        """
+        Add new field 'item' which is a link to TARGET_MODEL
+        """
+        target_field = models.ForeignKey(cls.TARGET_MODEL)
+        target_field.contribute_to_class(cls, 'item')
+        status_field = models.CharField(
+            max_length=30,
+            choices=Item.STATUS_CHOICES + cls.STATUS_CHOICES,
+            default=cls.DEFAULT_CHOICE)
+        status_field.contribute_to_class(cls, 'status')
+
+    def __str__(self):
+        return '%s: %s - %s' % (
+            self.date.strftime('%Y-%m-%d'),
+            self.status,
+            self.item)
+
+    class Meta:
+        abstract = True
+        ordering = ('-date',)