backend/src/structs/preferences.py

@@ -39,3 +39,16 @@ class Preferences(BaseModel) :
 
     max_time_minute: Optional[int] = 3*60
     detour_tolerance_minute: Optional[int] = 0
+
+
+    def model_post_init(self, __context):
+        """
+        Method to validate proper initialization of individual Preferences.
+        Raises ValueError if the Preference type does not match with the field name.
+        """
+        if self.sightseeing.type != 'sightseeing':
+            raise ValueError(f'The sightseeing preference cannot be {self.sightseeing.type}.')
+        if self.nature.type != 'nature':
+            raise ValueError(f'The nature preference cannot be {self.nature.type}.')
+        if self.shopping.type != 'shopping':
+            raise ValueError(f'The shopping preference cannot be {self.shopping.type}.')