Mongodb: Search for IDs within a nested array field

My MongoDB data structure includes user profiles with friend request information. Here's an example:

{
    _id: "someId",
    profile: {
        username: "oliv",
        friendRequests: [
            { fromUserId: "anId", accepted: false, created: "someDate"},
            { fromUserId: "otherId", accepted: true, created: "otherDate"}
        ]
}

I'm trying to retrieve the user objects referenced in my logged-in user's friend requests. I attempted this query:

Meteor.users.find({_id: {$in: Meteor.user().profile.friendRequests.fromUserId}});
// Note: Meteor.users is the collection and Meteor.user() gets the current user

Unfortunately, it's not working, possibly due to the nested array structure.
Is there a way to instruct MongoDB to iterate through the fromUserId values?

Thank you

javascriptarraysmongodbmeteor

Answer №1

Modify your query to:

Meteor.users.find({_id: {$in: _.pluck(Meteor.user().profile.friendRequests, 'fromUserId') }});

Explanation:

friendRequests contains an array of objects, and $in requires an array of strings (the ids). By utilizing _.pluck, you can extract the values of fromUserId from each object in the array.

Answer to query ("what if I only want to retrieve the ids from friend requests where "accepted" is false?"):

_.pluck(
    _.filter(Meteor.user().profile.friendRequests, function (req) {
        return !req.accepted;
    }),
    'fromUserid'
);

Visit Underscore filter documentation

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