Don't buy hearts, use them instant instead. Fixes #38

squirrelbattle/entities/items.py

@@ -49,7 +49,7 @@ class Item(Entity):
         """
         self.held = True
         self.held_by = player
-        self.map.remove_entity(self)
+        self.held_by.map.remove_entity(self)
         player.add_to_inventory(self)
 
     def save_state(self) -> dict:
@@ -80,7 +80,7 @@ class Heart(Item):
         When holding a heart, heal the player and don't put item in inventory.
         """
         player.health = min(player.maxhealth, player.health + self.healing)
-        self.map.remove_entity(self)
+        player.map.remove_entity(self)
 
     def save_state(self) -> dict:
         """

squirrelbattle/game.py

@@ -194,7 +194,7 @@ class Game:
         if self.store_menu.values and not self.player.dead:
             if key == KeyValues.ENTER:
                 item = self.store_menu.validate()
-                self.player.add_to_inventory(item)
+                item.hold(self.player)
                 self.store_menu.merchant.inventory.remove(item)
             # Ensure that the cursor has a good position
             self.store_menu.position = min(self.store_menu.position,

squirrelbattle/interfaces.py

@@ -68,6 +68,7 @@ class Map:
         """
         Unregister an entity from the map.
         """
+        if entity in self.entities:
             self.entities.remove(entity)
 
     def find_entities(self, entity_class: type) -> list: