修复 MySQL 上时间戳字段溢出的问题

submission/models.py

@@ -9,9 +9,9 @@ class Submission(models.Model):
     user_id = models.IntegerField(db_index=True)
     create_time = models.DateTimeField(auto_now_add=True)
     # 判题开始时间
-    judge_start_time = models.IntegerField(blank=True, null=True)
+    judge_start_time = models.BigIntegerField(blank=True, null=True)
     # 判题结束时间
-    judge_end_time = models.IntegerField(blank=True, null=True)
+    judge_end_time = models.BigIntegerField(blank=True, null=True)
     result = models.IntegerField(default=result["waiting"])
     language = models.IntegerField()
     code = models.TextField()
@@ -28,3 +28,6 @@ class Submission(models.Model):
 
     class Meta:
         db_table = "submission"
+
+    def __unicode__(self):
+        return self.id