有考试机会可再考

test_server/examtest/models.py

@@ -24,7 +24,6 @@ class Exam(CommonModel):
     def __str__(self):
         return self.name
 
-
 class ExamTest(CommonModel):
     '''
     考试记录表
@@ -54,6 +53,7 @@ class ExamTest(CommonModel):
         verbose_name_plural = verbose_name
 
 
+
 class AnswerDetail(SoftCommonModel):
     examtest = models.ForeignKey(ExamTest, on_delete=models.CASCADE, related_name='answerdetail_examtest')
     question = models.ForeignKey(Question, on_delete=models.CASCADE)

test_server/examtest/views.py

@@ -105,9 +105,10 @@ class ExamViewSet(ModelViewSet):
             now = timezone.now()
             try:
                 exam = Exam.objects.get(code=code, opentime__lt=now, closetime__gt=now)
-                if ExamTest.objects.filter(exam=exam, consumer=request.user).exists():
+                tests = ExamTest.objects.filter(exam=exam, consumer=request.user)
-                    return Response({'error':'您已参加过该场考试'})
+                if tests.count() <= exam.chance: # 还有考试机会就可以接着考
                     return Response({'exam':exam.pk})
+                return Response({'error':'考试机会不足'})
             except:
                 return Response({'error':'考试编号不存在'})
         return Response({'error':'操作失败'})