Mongoose, check if value exists in an array of objects

$elemMatch can be used with Arrays of Embedded Documents:

In your case you could try:

Person.find({    members: {       $elemMatch: { id: id1 }    }}); 

But since it is a Single Query Condition:

Person.find({    "members.id": id1}); 

Would do the trick.

You can use elem match in the following way:

db.collection.find({  arrayfield: {    $elemMatch: {      id: ObjectId("5eaaeedd00101108e1123461")    }  }})

The same can be done in mongoose in the following ways:

query.elemMatch('arrayfield', { id: ObjectId("5eaaeedd00101108e1123461") })

.

query.where('arrayfield').elemMatch({ id: ObjectId("5eaaeedd00101108e1123461") })

.

query.elemMatch('arrayfield', function (elem) {  elem.where('id').equals(ObjectId("5eaaeedd00101108e1123461"));})

.

query.where('arrayfield').elemMatch(function (elem) {  elem.where({ id: ObjectId("5eaaeedd00101108e1123461") });})

I have used this example collection:

[  {    "_id": ObjectId("5eaaeedd00101108e1123451"),    "arrayfield": [      {        id: ObjectId("5eaaeedd00101108e1123461"),        name: "David"      },      {        id: ObjectId("5eaaeedd00101108e1123462"),        name: "Brown"      }    ]  },  {    "_id": ObjectId("5eaaeedd00101108e1123452"),    "arrayfield": [      {        id: ObjectId("5eaaeedd00101108e1123471"),        name: "Maple"      },      {        id: ObjectId("5eaaeedd00101108e1123472"),        name: "Green"      }    ]  },  {    "_id": ObjectId("5eaaeedd00101108e1123453"),    "arrayfield": [      {        id: ObjectId("5eaaeedd00101108e1123461"),        name: "David"      },      {        id: ObjectId("5eaaeedd00101108e1123482"),        name: "Lacey"      }    ]  }]

Want to try live? Try it on mongo playground with this linkhttps://mongoplayground.net/p/H3fdmp9HkQv

You can use members.id as field in your query to match your subdocument ids :

Person.find({ "members.id": { "$in": ["id1"] } })