我如何将 {allowDiskUse: true} 放在 pymongo 上？

Question

我有这个 python 代码：

import pymongo
import time
start_time = time.time()

connection_string = 'mongodb://localhost'
connection = pymongo.MongoClient(connection_string)
database = connection.solutions

pipe = [ 
  {
    '$project':{
      "_id":0
    }
  },
  {
    '$group':{
      "_id":{
        "vehicleid":"$vehicleid",
        "date":"$metrictimestamp"
      },'count':{'$sum':1}
    }
  }
         ]
query = list(database.solution1.aggregate(pipe))
print("--- %s seconds ---" % (time.time() - start_time))

我收到以下错误消息：pymongo.errors.OperationFailure: Exceeded memory limit for $group，但不允许外部排序。传递 allowDiskUse:true 以选择加入。

如何使用 allowDiskUse: true？

Answer 1

query = list(database.solution1.aggregate(pipe, allowDiskUse=True))

参考：pymongo Collection level operations