mongodb replaceroot
Replaces the input document with the specified document. The operation replaces all existing fields in the input document, including the _id field. You can ... ,To ensure that the replacement document exists, use a $match stage first to check for existence before passing documents to the $replaceRoot stage (see ...
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 mongodb replaceroot 相關參考資料
$mergeObjects (aggregation) — MongoDB Manual
The following operation first uses the $lookup stage to join the two collections by the item fields and then uses $mergeObjects in the $replaceRoot to merge the ... https://docs.mongodb.com $replaceRoot (aggregation) — MongoDB Manual
Replaces the input document with the specified document. The operation replaces all existing fields in the input document, including the _id field. You can ... https://docs.mongodb.com $replaceRoot (aggregation) — MongoDB Manual 3.4
To ensure that the replacement document exists, use a $match stage first to check for existence before passing documents to the $replaceRoot stage (see ... http://www.mongoing.com $replaceRoot in mongodb - Stack Overflow
You need to use $replaceRoot to change your root document db.collection.aggregate([ "$addFields": "_id.features": "$features" } } ... https://stackoverflow.com $replaceRoot in mongodb aggregation - Stack Overflow
You can try below aggregation using $replaceRoot db.collection.aggregate([ "$match": "codeInstances.name": "b", "type": "Package" }} ... https://stackoverflow.com $replaceRoot of embedded document inside an array in MongoDB ...
There is no $replaceRoot like for embedded array but you can achieve similar effect using $map to transform the array into new format. https://stackoverflow.com How to flatten a subdocument into root level in MongoDB? - Stack ...
You can use MongoDB projection i.e $project aggregation framework pipeline ... You can use $replaceRoot with a $addFields stage as follows: https://stackoverflow.com MongoDB $match stage after $replaceRoot - Stack Overflow
Consider the following. I have documents in which I save versions of fields. Fields in the original document can null and I only save fields that ... https://stackoverflow.com MongoDB 3.4 - get array of subdocuments without root document ...
And then use the $replaceRoot stage to promote the nodes document to the top ... Here is how you can do this with aggregation (Mongo v3.4+):. https://stackoverflow.com Mongodb v3.6 中文文档- $ replaceRoot（聚合） | Docs4dev
MongoDB是一个文档数据库，具有您需要的可查询性和索引所需的可伸缩性和 ... 如果 <replacementDocument> 不是文档， $replaceRoot 操作将失败并显示错误。 https://www.docs4dev.com |