python - Django mongo db过滤器查询不返回任何数据

Question

当我尝试om = OttMessage.objects.filter()返回 ott_message 集合中的所有文档时。

但是当我尝试om = OttMessage.objects.filter(prediction_status = -1)它不返回任何数据时。

OttMessage model.py 相关行

prediction_status = IntField(default=-1, db_field='ps') 例如

ott_message 集合中有许多文档具有 prediction_status 字段 -1

  {
     "classification" : null,
     "message_from" : "XXXXXXXX",
     "id" : "5b61d4649cdae332bf9151f9",
     "is_classified" : false,
     "prediction_status" : -1,
     "post_disposition" : null,
     "message" : "XXXXXXXXXXXXXXXXXXXXXX",
     "channel" : 1,
     "message_date" : "2018-08-01T15:42:30",
     "group_name" : "Resale Gurgaon req IC",
     "req_disposition" : null,
     "manual_tagged_status" : -1
  },
  {
     "prediction_status" : -1,
     "is_classified" : false,
     "classification" : null,
     "message_from" : "XXXXXXXXXXXXX",
     "id" : "5b61da629cdae343169150cf",
     "manual_tagged_status" : -1,
     "req_disposition" : null,
     "message" : "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
     "post_disposition" : null,
     "message_date" : "2018-08-01T15:50:19",
     "group_name" : "XXXXXXXXXXXXXXX",
     "channel" : 1
  }

谁能告诉我哪里出错了？谢谢