pymongo.errors.OperationFailure: $in 需要一个数组

Question

我收到错误 pymongo.errors.OperationFailure: $in 需要一个数组而运行以下代码：-

rom pymongo import MongoClient
from bson.dbref import DBRef
from bson.objectid import ObjectId
import sys
sys.path.append('/etc/insight')
import constants
constant = constants.Constants()
# Create MongoDB Connection
mongoconn = MongoClient(constant.MONGO_HOST, readPreference=constant.READ_PREFERENCE)
db = mongoconn[constant.MONGO_USERNAME]
# Mongo authentication to connect to database
auth = db.authenticate(constant.MONGO_USERNAME, constant.MONGO_PASSWORD)


# Query in network
nw = list(db.network.find({'orgId':{'$exists':True}},{'_id':1}))

print(nw)

# Query in networkSetting
networkIds = []

for id in nw:
    output = list(db.networkSetting.find({'networkId':{'$in':id['_id']},'locationRegion.wirelessCountryRegion':'JP'},{'networkId':1}))
    networkIds.append(output)



print(networkIds)

任何人都可以帮助我为什么会收到此错误。我试过写：-

output = list(db.networkSetting.find({'networkId':{'$in':list(id['_id'])},'locationRegion.wirelessCountryRegion':'JP'},{'networkId':1}))

但后来又说 ObjectId 不可迭代。谁能解决问题。

Answer 1

$in 需要一个数组，但是你的过滤器只需要一个简单的字符串搜索，所以你的查询应该是：

output = list(db.networkSetting.find({'networkId': id['_id'], 'locationRegion.wirelessCountryRegion': 'JP'}, {'networkId': 1}))

pymongo.errors.OperationFailure: $in 需要一个数组

pymongo.errors.OperationFailure: $in needs an array

python-3.x

pymongo-3.x