sum the Item iif and irf as well as the Bundle tif and trf

app/models/item.py

@@ -6,7 +6,6 @@ from models.attribute import Attribute
 from lib.irt.item_response_function import ItemResponseFunction
 from lib.irt.item_information_function import ItemInformationFunction
 
-
 class Item(BaseModel):
     id: int
     passage_id: Optional[int]
@@ -35,3 +34,19 @@ class Item(BaseModel):
             ) == ref_attribute.value.lower():
                 return True
         return False
+
+    def iif_sum(self, solver_run):
+        total = 0
+
+        for target in solver_run.objective_function.tif_targets:
+            total += self.iif(solver_run, target.theta)
+
+        return total
+
+    def irf_sum(self, solver_run):
+        total = 0
+
+        for target in solver_run.objective_function.tif_targets:
+            total += self.irf(solver_run, target.theta)
+
+        return total