more better well factoredness

app/models/item.py

@@ -17,14 +17,14 @@ class Item(BaseModel):
   def irf(self, solver_run, theta):
     return ItemResponseFunction(solver_run.irt_model).calculate(b_param=self.b_param,theta=theta)
 
-  def get_attribute(self, id, value):
+  def get_attribute(self, ref_attribute):
     for attribute in self.attributes:
-      if attribute.id == id and attribute.value == value:
+      if attribute.id == ref_attribute.id and attribute.value == ref_attribute.value:
         return attribute.value
     return False
 
-  def attribute_exists(self, id, value):
+  def attribute_exists(self, ref_attribute):
     for attribute in self.attributes:
-      if attribute.id == id and attribute.value == value:
+      if attribute.id == ref_attribute.id and attribute.value == ref_attribute.value:
         return True
     return False

app/models/solver_run.py

@@ -17,3 +17,13 @@ class SolverRun(BaseModel):
   theta_cut_score: float = 0.00
   advanced_options: Optional[AdvancedOptions]
   engine: str
+
+  def get_item(self, item_id):
+    for item in self.items:
+      if str(item.id) == item_id:
+        return item
+    return False
+
+  def remove_items(self, items):
+    self.items = [item for item in self.items if item not in items]
+    return True