migrate to postgres json field

submission/migrations/0008_auto_20171011_1214.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.4 on 2017-10-11 12:14
+from __future__ import unicode_literals
+
+import django.contrib.postgres.fields.jsonb
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('submission', '0007_auto_20170923_1318'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='submission',
+            name='info',
+            field=django.contrib.postgres.fields.jsonb.JSONField(default=dict),
+        ),
+        migrations.AlterField(
+            model_name='submission',
+            name='statistic_info',
+            field=django.contrib.postgres.fields.jsonb.JSONField(default=dict),
+        ),
+    ]

submission/models.py

@@ -1,5 +1,5 @@
 from django.db import models
-from jsonfield import JSONField
+from utils.models import JSONField
 from account.models import AdminType
 from problem.models import Problem
 from contest.models import Contest
@@ -31,12 +31,12 @@ class Submission(models.Model):
     code = models.TextField()
     result = models.IntegerField(db_index=True, default=JudgeStatus.PENDING)
     # 判题结果的详细信息
-    info = JSONField(default={})
+    info = JSONField(default=dict)
     language = models.CharField(max_length=20)
     shared = models.BooleanField(default=False)
     # 存储该提交所用时间和内存值，方便提交列表显示
     # {time_cost: "", memory_cost: "", err_info: "", score: 0}
-    statistic_info = JSONField(default={})
+    statistic_info = JSONField(default=dict)
 
     def check_user_permission(self, user):
         return self.user_id == user.id or \