[英]MongoDB collection update with $set and aggregate
我需要將timestamp_ms
的類型從string
更改為double
並創建基於此新timestamp_ms
字段的FixedDate
字段。 然后,在NewDate
字段中將時間戳信息更改為 ISO 日期。
我使用了這個代碼:
collection.update({
"FixedDate": {"$exists": False}
},[{
"$set":
{"FixedDate":
{"$convert":
{"input": "$timestamp_ms",
"to": "double"
}
}
}
},
{"$set":
{"NewDate":
{"$toDate": "$FixedDate"
}
}
}
], multi=True)
它給出了這個錯誤信息:
TypeError: document must be an instance of dict, bson.son.SON, or other type that inherits from collections.Mapping
我的數據如下所示:
{'_id': ObjectId('5afea920d326051990a7f337'), 'created_at': 'Fri May 18 10:21:07 +0000 2018', 'timestamp_ms': '1526638867739'}
{'_id': ObjectId('5afea920d326051990a7f339'), 'created_at': 'Fri May 18 10:21:08 +0000 2018', 'timestamp_ms': '1526638868310'}
{'_id': ObjectId('5afea972d326051c5c05bc11'), 'created_at': 'Fri May 18 10:22:30 +0000 2018', 'timestamp_ms': '1526638950799'}
{'_id': ObjectId('5afea974d326051c5c05bc16'), 'created_at': 'Fri May 18 10:22:32 +0000 2018', 'timestamp_ms': '1526638952160'}
{'_id': ObjectId('5afea974d326051c5c05bc17'), 'created_at': 'Fri May 18 10:22:32 +0000 2018', 'timestamp_ms': '1526638952841'}
看起來您有幾個問題,首先是您沒有使用 4.2 的最新驅動程序(它仍處於測試階段,因此如果您只是進行 pip 升級,您仍將使用 3.8,而您需要 3.9)。 至少在 GA 之前使用python -m pip install https://github.com/mongodb/mongo-python-driver/archive/3.9.0b1.tar.gz
安裝最新版本。
其次,您應該使用update_one
或update_many
而不是使用multi
標志update
。
使用最新版本嘗試您的代碼,這有效:
collection.update_many(
{"FixedDate": {"$exists": False}},
[{"$set":{
"FixedDate":{"$toDouble":"$timestamp_ms"}
}},
{"$set":{
"NewDate": {"$toDate": "$FixedDate"}
}}
])
我已經嘗試過你的聚合框架問題,
let query = [
{
$match: {
"FixedDate": { "$exists": false }
}
}, {
$addFields: {
"FixedDate":
{
"$convert":
{
"input": "$timestamp_ms",
"to": "double"
}
},
},
}, {
$addFields: {
"NewDate":
{
"$toDate": "$FixedDate"
}
}
}]
db.collection.aggregate(query)
這里你需要使用兩次$addFields
結果
/* 1 createdAt:18/05/2018, 15:51:20*/
{
"_id" : ObjectId("5afea920d326051990a7f337"),
"created_at" : "Fri May 18 10:21:07 +0000 2018",
"timestamp_ms" : "1526638867739",
"FixedDate" : 1526638867739,
"NewDate" : ISODate("2018-05-18T15:51:07.739+05:30")
},
/* 2 createdAt:18/05/2018, 15:51:20*/
{
"_id" : ObjectId("5afea920d326051990a7f339"),
"created_at" : "Fri May 18 10:21:08 +0000 2018",
"timestamp_ms" : "1526638868310",
"FixedDate" : 1526638868310,
"NewDate" : ISODate("2018-05-18T15:51:08.310+05:30")
},
/* 3 createdAt:18/05/2018, 15:52:42*/
{
"_id" : ObjectId("5afea972d326051c5c05bc11"),
"created_at" : "Fri May 18 10:22:30 +0000 2018",
"timestamp_ms" : "1526638950799",
"FixedDate" : 1526638950799,
"NewDate" : ISODate("2018-05-18T15:52:30.799+05:30")
},
/* 4 createdAt:18/05/2018, 15:52:44*/
{
"_id" : ObjectId("5afea974d326051c5c05bc16"),
"created_at" : "Fri May 18 10:22:32 +0000 2018",
"timestamp_ms" : "1526638952160",
"FixedDate" : 1526638952160,
"NewDate" : ISODate("2018-05-18T15:52:32.160+05:30")
},
/* 5 createdAt:18/05/2018, 15:52:44*/
{
"_id" : ObjectId("5afea974d326051c5c05bc17"),
"created_at" : "Fri May 18 10:22:32 +0000 2018",
"timestamp_ms" : "1526638952841",
"FixedDate" : 1526638952841,
"NewDate" : ISODate("2018-05-18T15:52:32.841+05:30")
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.