updating all array elements of a field of a meteor collection

Question

I have updated my Meteor.users() collection to include a 'profile' subdoc and inside profile I have an array of objects called 'notifications'. The object structure for notifications looks like this:

           'profile.notifications': {
            prompt: prompt,
            message: message,
            hasBeenRead: false,
            timestamp: Messages.find({}, {sort: {"ts": 1}, limit: 0}).fetch().pop().ts,
           }

Is there a way, using one of Mongo's methods, to change hasBeenRead to true for all of the objects within the array? I can change just one element using array indexes (the code below), but I can't use this approach to change all of them at once.

    Meteor.users.update({
       _id:  Meteor.userId() 
     }, {
        'profile.notifications.0.hasBeenRead': true //only changes first elem
        }
     })

Michel Floyd · Accepted Answer · 2015-11-03 19:41:41Z

1

There is currently no way to update all elements of an array through mongo directly. You can either send multiple updates to mongo or extract the notifications array, update all the elements, then update the document in one go.

var notifications = Meteor.user().profile.notifications;
notifications.forEach(function(e,i,a){a[i].hasBeenRead=true});
Meteor.users.update({ _id: Meteor.userId() },
  { $set: { 'profile.notifications': notifications }});

answered Nov 3, 2015 at 19:41

Michel Floyd

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