search inside array with object mongodb
db.users.find({awards: {$elemMatch: {award:'National Medal', year:1975}}})search inside array with object mongodb
db.users.find({awards: {$elemMatch: {award:'National Medal', year:1975}}})lookup in mongodb array
> db.demo396.aggregate([
... { "$lookup": {
... "from": "demo395",
... "let": { "details": "$details" },
... "pipeline": [
... { "$match": { "$expr": { "$in": [ "$_id", "$$details" ] } } }
... ],
... "as": "output"
... }}
... ])mongodb aggregate lookup array of objects
db.getCollection('widgets').aggregate([
{ $unwind: '$info' },
{
$lookup: {
from: 'icons',
localField: 'info.iconId',
foreignField: '_id',
as: 'info.icon'
}
},
{ $unwind: '$info.icon' },
{
$group: {
_id: '$_id',
root: { $mergeObjects: '$$ROOT' },
info: { $push: '$info' }
}
},
{
$replaceRoot: {
newRoot: {
$mergeObjects: ['$root', '$$ROOT']
}
}
},
{
$project: {
root: 0
}
}
]);find object in array mongodb
db.users.findOne({"_id": id},{awards: {$elemMatch: {award:'Turing Award', year:1977}}})lookup in mongodb array
{ "_id" : ObjectId("5e5e787817aa3ef9ab8ab209"), "details" : [ ObjectId("5e5e782317aa3ef9ab8ab207"), ObjectId("5e5e782317aa3ef9ab8ab208") ], "output" : [ { "_id" : ObjectId("5e5e782317aa3ef9ab8ab207"), "Name" : "Chris" }, { "_id" : ObjectId("5e5e782317aa3ef9ab8ab208"), "Name" : "David" } ] }mongodb find inside array of object
> db.searchArrayDemo.find({EmployeeDetails:{$elemMatch:{EmployeePerformanceArea : "C++", Year : 1998}}}).pretty();Copyright © 2021 Codeinu
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