Inserting or updating an attribute of an object within an array

Question

I am attempting to update (or insert) an attribute of an object within an array in MongoDB, but I don't seem to be able to access the array (apps), or the attribute (appId).

Basically, what's happening is the array of "apps" is being created, but the appId is not populating as it should be.

Can anyone take a look and provide some insight?

Template.CurriculumBuilder.events({
   'submit #addToCurriculum': function(e) {
    event.preventDefault();

    const appId = this._id;
    console.log('Here is the app id --> ' + appId)

    const userId = Meteor.user()._id;
    console.log('Here is the user id --> ' + userId);

    const doc = Curriculum.findOne({ user: userId });
    console.log('Here is the doc id --> ' + doc._id)

    Curriculum.update(doc._id, { $set: { apps: [{ $addToSet: { appId: appId } } ] } } );
    console.log('Apps have been added to --> ' + doc._id)

    return false;
}
});

UPDATE

As answered below, the DB call should be:

Curriculum.update(doc._id,{ $addToSet: { apps: { appId: appId } } } );

Michel Floyd · Accepted Answer · 2016-07-07 21:50:56Z

1

You don't need the $set or the square brackets:

Curriculum.update(doc._id,{ $addToSet: { apps: { appId: appId } } );

In English:

add the object {appId: appId} to the array apps in the document whose _id is doc._id

edited Jul 7, 2016 at 21:50

answered Jul 7, 2016 at 21:45

Michel Floyd

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4 Comments

wjfieseler Over a year ago

Sure. I think I just did. One another quick question. Would inserting data into a new Curriculum work similarly? So, Curriculum.insert({ $addToSet: { apps: { appId: appId } } ); ?

Michel Floyd Over a year ago

I think you'd want Curriculum.insert({ apps: [{ appId: appId }] } ); to initialize.

wjfieseler Over a year ago

What if, I have a separate Array called "userAppList" ... with multiple ID's, already created BEFORE I want to "Insert" or create the document?

Michel Floyd Over a year ago

Then you can just do: Curriculum.insert({ apps: userAppList } )

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