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/games/apps.py

@@ -1,5 +1,28 @@
 from django.apps import AppConfig
+from django.db.models import signals
+
+
+def call_on_class_prepared(sender, **kwargs):
+    """
+    Calls the function only if it is defined in the class being prepared
+    """
+    try:
+        sender.on_class_prepared()
+    except AttributeError:
+        pass
 
 
 class GamesConfig(AppConfig):
     name = 'games'
+
+    def ready(self):
+        """
+        Add signals to the application
+        """
+        from .models import Game
+        from .signals import game_saved
+        signals.post_save.connect(game_saved, sender='games.Game')
+
+    def __init__(self, app_name, app_module):
+        super(GamesConfig, self).__init__(app_name, app_module)
+        signals.class_prepared.connect(call_on_class_prepared)