3 мар. 2014 г. · Is there an easy way to "$push" all fields of a document? For example: Say I have a Mongo collection of books: {author: "tolstoy", title:"war & peace", price: ... How to $push all of the document in aggregation instead of ... MongoDb aggregation framework push all values of a field to ... Другие результаты с сайта stackoverflow.com

Use the $push operator to append a specified value to an array. $push supports the $each, $slice, $sort, and $position modifiers for advanced array ...

$push returns an array of all values that result from applying an expression to documents. $push is available in these stages:

Adds new fields to documents. $addFields outputs documents that contain all existing fields from the input documents and newly added fields.

10 окт. 2024 г. · The $push operator in MongoDB is a powerful tool used to update arrays within documents. It appends the entire array as a single element.

24 февр. 2021 г. · I'm trying to insert documents into an array while also updating fields of existing elements in the same array. Am I doing something wrong?

1 янв. 2021 г. · You can use $unwind stage, Deconstructs an array field from the input documents to output a document for each element.

4 февр. 2023 г. · You have to do 2 queries in the 3.2 version, first, find the matching documents, and second, update query (you need to pass that property value from the above ...

When grouping we use the _id field to hold the common values that we are grouping our documents on. This means that the output of a group aggregation only holds ...

Returns an array of all values that result from applying an expression to each document in a group of documents that share the same group by key.