ENH: Added an active attribute to Questions.

This allows us to enable/disable questions in a question paper.  Only
questions that are active are used to create a question paper. I've also
modified the load_exam/load_questions_xml to deactivate rather than
delete old questions.

2 files changed, 6 insertions, 4 deletions

diff --git a/exam/management/commands/load_exam.py b/exam/management/commands/load_exam.py
index 157a94a..3f247a1 100644
--- a/exam/management/commands/load_exam.py
+++ b/exam/management/commands/load_exam.py
@@ -8,9 +8,10 @@ from django.core.management.base import BaseCommand
 from exam.models import Question, Quiz
 
 def clear_exam():
-    """Delete all questions from the database."""
+    """Deactivate all questions from the database."""
     for question in Question.objects.all():
-        question.delete()
+        question.active = False
+        question.save()
         
     # Deactivate old quizzes.
     for quiz in Quiz.objects.all():
diff --git a/exam/management/commands/load_questions_xml.py b/exam/management/commands/load_questions_xml.py
index 1e9cfde..aa403dd 100644
--- a/exam/management/commands/load_questions_xml.py
+++ b/exam/management/commands/load_questions_xml.py
@@ -18,9 +18,10 @@ def decode_html(html_str):
             lambda m: unichr(name2codepoint[m.group(1)]), html_str)
 
 def clear_questions():
-    """Delete all questions from the database."""
+    """Deactivate all questions from the database."""
     for question in Question.objects.all():
-        question.delete()
+        question.active = False
+        question.save()
 
 def load_questions_xml(filename):
     """Load questions from the given XML file."""