增加题目提交总数和通过率统计字段

submission/migrations/0002_submission_is_counted.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('submission', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='submission',
+            name='is_counted',
+            field=models.BooleanField(default=False),
+        ),
+    ]