1 | initial version |
You can use the $group
stage in MongoDB aggregation to retrieve the count along with other attributes.
Here's an example:
db.collection.aggregate([
{$match: {someField: "someValue"}}, // filter documents
{$group: {
_id: "$someField", // group by someField
count: {$sum: 1}, // count documents in group
otherAttribute: {$first: "$otherField"} // retrieve first value of otherField in group
}}
])
In this example, the aggregation pipeline first filters documents that have a specific value in the someField
field. Then it groups the remaining documents by the someField
field using the $group
stage.
Within the group, it calculates the count of documents in the group using the $sum
operator and assigns it to the field count
. It also retrieves the first value of the otherField
field in the group using the $first
operator and assigns it to the field otherAttribute
.
The resulting output will be a list of groups, each containing the someField
, count
, and otherAttribute
fields.