More!

tvdt/quiz/models/question.py

@@ -1,7 +1,10 @@
 from django.db import models
+from django.db.models import QuerySet
 from django.utils.translation import gettext_lazy as _
 from django_stubs_ext.db.models import TypedModelMeta
 
+from quiz.models import Answer
+
 
 class NoActiveTestForSeason(Exception):
     pass
@@ -21,6 +24,33 @@ class Question(models.Model):
     )
     enabled = models.BooleanField(default=True, verbose_name=_("enabled"))
 
+    @property
+    def order(self):
+        return self._order
+
+    @property
+    def right_answer(self) -> QuerySet[Answer]:
+        return self.answers.filter(is_right_answer=True)
+
+    @property
+    def has_right_answer(self) -> bool:
+        return self.answers.filter(is_right_answer=True).count() > 0
+
+    @property
+    def errors(self) -> str | None:
+        if self.answers.count() == 0:
+            return _("Error: Question has no answers")
+
+        n_correct_answers = self.answers.filter(is_right_answer=True).count()
+
+        if n_correct_answers == 0:
+            return _("Error: This question has no right answer!")
+
+        if n_correct_answers > 1:
+            return _("Warning: This question has multiple correct answers")
+
+        return None
+
     def __str__(self) -> str:
         return f"{self._order + 1}. {self.question} ({self.quiz}) ({self.answers.count()} answers, {self.answers.filter(is_right_answer=True).count()} correct)"