I have this data:
[
{
contacts: [ [Object] ],
_id: 614a1301a926d73628d791fe,
username: 'erick',
socketId: 'OB8uqmHnsGPKC3gcAAAB'
},
{
contacts: [
contacts: [ [Object] ],
_id: 614a1301a926d73628d791fe,
username: 'erick',
socketId: 'OB8uqmHnsGPKC3gcAAAB'
],
_id: 614a1306a926d73628d79204,
username: 'tachancka',
socketId: 'cN333_zn8r48K_0tAAAB'
}
]
And i need to find the username of 'erick' inside 'tachancka' contacts. I have tried a few ways to do it but none of them worked for me, returning null.
For example:
User.findOne({contacts: {$elemMatch:{'username': 'erick'}}})
Or:
User.findOne({'contacts.username': 'erick'})
pls refer to sample here: https://mongoplayground.net/p/Np_MdrubPgT
you may use
db.User.find({
username: "tachancka",
"contacts.username": "erick"
})
When you have array of objects and if you want to match all the field within object then we use $elemMatch, here in your case i feel username is not part of contacts array hence you will not use $elemMatch