but when removing enemy constraints

app/helpers/problem_helper.py

@@ -3,21 +3,19 @@ from typing import Tuple
 from models.item import Item
 
 def sanctify(solved_items: [Item]) -> Tuple[list]:
-    sacred_ids = []
     enemy_ids = []
 
     # get all enemies
     for item in solved_items:
-        # if it has enemies, check if it exists as part of the solved items
-        for enemy_id in item.enemies:
-            # if it does, it's a true enemy
-            if enemy_id in (item.id for item in solved_items):
-                enemy_ids.append(enemy_id)
-                # remove enemy from solved items,
-                # lest it has this sacred item added to enemies
-                solved_items = [i for i in solved_items if i.id != enemy_id]
+        # if the item is already an an enemy
+        # then it's enemy is sacred
+        if item.id not in enemy_ids:
+            # if it has enemies, check if it exists as part of the solved items
+            for enemy_id in item.enemies:
+                # if it does, it's a true enemy
+                if enemy_id in (i.id for i in solved_items):
+                    enemy_ids.append(enemy_id)
 
-        # the item is cleansed, now it's sacred
-        sacred_ids.append(item.id)
+    sacred_ids = [i.id for i in solved_items if i.id not in enemy_ids]
 
     return sacred_ids, enemy_ids

app/models/item.py

@@ -1,4 +1,4 @@
-from pydantic import BaseModel
+from pydantic import BaseModel, validator
 from typing import List, Optional
 
 from models.attribute import Attribute
@@ -16,6 +16,13 @@ class Item(BaseModel):
     b_param: float = 0.00
     response: Optional[int] = None
 
+    @validator("enemies", pre=True)
+    def set_enemies(cls, v) -> List[id]:
+        if v == "":
+            return []
+        enemies = list(filter(None, [int(enemy) for enemy in v.split(",")]))
+        return enemies
+
     def iif(self, irt_model, theta):
         return ItemInformationFunction(irt_model).calculate(b_param=self.b_param, theta=theta)
 

app/models/problem.py

@@ -8,7 +8,6 @@ from pulp import LpProblem, LpVariable, LpStatus, lpSum
 import logging
 
 from helpers.problem_helper import *
-
 from helpers import service_helper
 
 from models.solution import Solution
@@ -67,8 +66,8 @@ class Problem(BaseModel):
                     logging.info('enemies found, adding constraints...')
 
                     # remove old enemy/sacred constraints
-                    self.problem.constraints.pop('Exclude_enemy_items')
-                    self.problem.constraints.pop('Include_sacred_items')
+                    if 'Exclude_enemy_items' in self.problem.constraints.keys(): self.problem.constraints.pop('Exclude_enemy_items')
+                    if 'Include_sacred_items' in self.problem.constraints.keys(): self.problem.constraints.pop('Include_sacred_items')
 
                     # add constraint to not allow enemy items
                     self.problem += lpSum([