{
  "schema": {
    "bsonType": "object",
    "required": ["user_id"],
    "properties": {
      "_id": {
        "description": "ID，系统自动生成"
      },
      "friend_uid": {
        "bsonType": "string",
        "description": "被关注者user_id，参考uni-id-users表"
      },
      "follow_uid": {
        "bsonType": "string",
        "description": "关注者user_id，参考uni-id-users表"
      },
      "create_date": {
        "bsonType": "timestamp",
        "description": "创建时间"
      }
    }
  },
  "index": []
}