add ability to move items between inventories

test/test_inventories.py

@@ -161,13 +161,18 @@ def test_spell_slots(db, carl, wizard):
 def test_containers(db, carl):
     with db.transaction():
         ten_foot_pole = Item(name="10ft. Pole", item_type=ItemType.ITEM, consumable=False)
+        rope = Item(name="50 ft. of Rope", item_type=ItemType.ITEM, consumable=True, count=50)
         bag_of_holding = Container(name="Bag of Holding")
-        db.add_or_update([carl, ten_foot_pole, bag_of_holding])
+        db.add_or_update([carl, ten_foot_pole, rope, bag_of_holding])
 
-        # add the ten_foot_pole to the bag of holding
+        # add some items to the bag of holding
         assert bag_of_holding.add(ten_foot_pole)
+        assert bag_of_holding.add(rope)
         db.add_or_update(bag_of_holding)
+
         pole_from_bag = bag_of_holding.get(ten_foot_pole)
+        rope_from_bag = bag_of_holding.get(rope)
+
         assert pole_from_bag.item == ten_foot_pole
         assert pole_from_bag in bag_of_holding
         assert pole_from_bag not in carl.equipment
@@ -176,11 +181,38 @@ def test_containers(db, carl):
         assert carl.equipment.add(bag_of_holding)
         db.add_or_update(bag_of_holding)
         assert pole_from_bag in carl.equipment
+        assert rope_from_bag in carl.equipment
 
         # test equality of mappings
         carls_bag = carl.equipment.get(bag_of_holding)
         carls_pole = carl.equipment.get(ten_foot_pole)
+        carls_rope = carl.equipment.get(rope)
         assert carls_pole == pole_from_bag
+        assert carls_rope == rope_from_bag
 
-        # remove the pole from the bag
-        assert carls_bag.remove(pole_from_bag)
+        # use some rope
+        carls_rope.consume(10)
+        assert carls_rope.count == 40
+
+        # move the rope out of the bag of holding, but not the pole
+        assert carls_rope.move_to(carl.equipment)
+        assert carls_rope not in carls_bag
+        assert carls_pole in carls_bag
+        db.add_or_update(carl)
+
+        # get the db record anew, in case the in-memory representation isn't
+        # what's recorded in the database. Then make sure we didn't break
+        # anything by asserting we still only have 40ft of rope.
+        carl = db.Character.filter_by(name="carl").one()
+        assert carls_rope in carl.equipment
+        assert carls_rope not in carl.equipment.get(bag_of_holding)
+        assert carls_rope.count == 40
+
+        # old references are still valid
+        assert rope_from_bag == carls_rope
+
+        # use the rest of the rope
+        assert carls_rope.consume(40) == 0
+        print(rope_from_bag.inventory)
+        assert rope_from_bag not in carl.equipment
+        assert rope_from_bag not in carl.equipment.get(bag_of_holding)