To fill a property field in an array of objects using the Mongoose aggregate pipeline, you can use the $addFields
stage followed by the $map
and $mergeObjects
operators. Here's an example:
db.collection.aggregate([
{
$addFields: {
"arrayOfObjects": {
$map: {
input: "$arrayOfObjects",
as: "obj",
in: {
$mergeObjects: [
"$$obj",
{ "propertyToFill": "value" }
]
}
}
}
}
}
]);
In this example, arrayOfObjects
is the field containing the array of objects that you want to update. The $addFields
stage creates a new field called arrayOfObjects
with the updated objects.
The $map
operator goes through each object in the array and returns a new object with the updated property. The $$obj
variable represents each object in the array, and the $mergeObjects
operator merges the existing object with a new object that contains the property you want to fill.
Finally, the $addFields
stage adds the newly updated arrayOfObjects
field to the output documents.
Note that you can replace "value"
with a variable or another field value if you need to fill the property dynamically.
Please start posting anonymously - your entry will be published after you log in or create a new account. This space is reserved only for answers. If you would like to engage in a discussion, please instead post a comment under the question or an answer that you would like to discuss
Asked: 2023-06-14 23:06:20 +0000
Seen: 10 times
Last updated: Jun 14 '23
How can user input be added to an array using a loop in C# and then displayed through printing?
How can the objects that are duplicated within a nested array be removed?
How can I resolve the ValueError regarding incompatible shapes between (None, 20, 9) and (None, 9)?
What is a more effective method to verify the type of an Array containing elements of any type?
What is the way to add up items in an array with two dimensions using Google Apps Script?
How can an array be filtered using the values in another array?
Can an Array of Elements be made in Android?
What is the method to separate two values in a single column of a numpy array?