Issue #9 y #13 API basica de lista

lists/models.py

@@ -23,15 +23,15 @@ class Entity(Model):
 
 class Tag(Model):
     """Tag creada por un usuario"""
-    user = ForeignKey(User, on_delete=CASCADE)
+    user = ForeignKey(User, on_delete=CASCADE, related_name='tags')
     name = CharField(max_length=50)
 
 
 class ListItem(Model):
     """Item de la lista de un usuario"""
-    user = ForeignKey(User, on_delete=CASCADE)
+    user = ForeignKey(User, on_delete=CASCADE, related_name='list')
     entity = ForeignKey(Entity, on_delete=CASCADE)
-    tags = ManyToManyField(Tag, on_delete=CASCADE)
+    tags = ManyToManyField(Tag)
 
 
 class Stars(Model):