create base useranswer class

sbas/models.py

@@ -11,7 +11,7 @@ from django.utils.translation import gettext_lazy as _
 
 from sortedm2m.fields import SortedManyToManyField
 
-from generic.models import CidUser, CidUserGroup, ExamBase, ExamUserStatus, QuestionNote, UserUserGroup
+from generic.models import CidUser, CidUserGroup, ExamBase, ExamUserStatus, QuestionNote, CidUserAnswerBase, UserUserGroup
 
 import reversion
 
@@ -205,7 +205,7 @@ class Exam(ExamBase):
 
 
 @reversion.register
-class CidUserAnswer(models.Model):
+class CidUserAnswer(CidUserAnswerBase):
     """User answers by candidate"""
 
     question = models.ForeignKey(
@@ -217,8 +217,6 @@ class CidUserAnswer(models.Model):
         help_text="The correct answer",
     )
 
-    cid = models.IntegerField(blank=True, null=True)
-
     user = models.ForeignKey(
         settings.AUTH_USER_MODEL,
         on_delete=models.CASCADE,
@@ -232,9 +230,6 @@ class CidUserAnswer(models.Model):
         Exam, related_name="cid_user_answers", on_delete=models.CASCADE, null=True
     )
 
-    created = models.DateTimeField(auto_now_add=True)
-    updated = models.DateTimeField(auto_now=True)
-
     def __str__(self):
         return "{}/{}/{}".format(self.cid, self.exam, self.question.pk)