Make it impossible to use invalid languages

tin/apps/assignments/forms.py

@@ -23,7 +23,7 @@ def __init__(self, course, *args, **kwargs):
         self.fields["description"].widget.attrs.update({"id": "description"})
 
         # don't allow using deprecated versions of languages
-        self.fields["language_details"].queryset = Language.objects.filter(is_deprecated=False)
+        self.fields["language_details"].queryset = Language.active.all()
 
         # Prevent changing the language of an assignment after it has been created
         instance = getattr(self, "instance", None)

tin/apps/assignments/models.py

@@ -684,6 +684,11 @@ def run(self, assignment: Assignment):
         assignment.save()
 
 
+class ActiveLanguageManager(models.Manager):
+    def get_queryset(self) -> models.QuerySet:
+        return super().get_queryset().filter(is_deprecated=False).exclude(path="/dev/null")
+
+
 class Language(models.Model):
     """Which version of a language is used for an assignment.
 
@@ -707,6 +712,9 @@ class Language(models.Model):
         help_text="The version of the executable. 0 if executable is /dev/null."
     )
 
+    objects = models.Manager()
+    active = ActiveLanguageManager()
+
     class Meta:
         ordering = ["-version"]
 

tin/apps/venvs/forms.py

@@ -9,10 +9,7 @@
 class VenvForm(forms.ModelForm):
     def __init__(self, *args, **kwargs) -> None:
         super().__init__(*args, **kwargs)
-        self.fields["language"].queryset = Language.objects.filter(
-            language="P",
-            is_deprecated=False,
-        )
+        self.fields["language"].queryset = Language.active.filter(language="P")
 
     class Meta:
         model = Venv