Mongodb query.update method does not update array

Question

Previously I had tried something like (with mongoose and promises):

var cursor = User.find({email: from.address, token: tokenMatches[1]}); and then

return cursor.update(
    {'votes.title': b},
    {'$set': { 'votes.$.category': a }}
).then(function (result) {
    if(result.nModified == 0) {
        return cursor.update({}, {'$push': { votes: { category: a, title: b }}}).then(function (res) {
            ServerLog('updatePush', res);
            return res;
        });
    }
});

But it always returned nModified = 0 for the first and second call. Until I found out that the cursor object actually has no update function. So why is it so? And why did it not throw an exception?

JohnnyHK · Accepted Answer · 2016-04-22 22:38:37Z

2

Model.find returns a Query object, not a cursor. Query does have an update method that lets you execute the query as an update operation.

answered Apr 22, 2016 at 22:38

JohnnyHK

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2 Comments

valoricDe Over a year ago

Ok, so it actually should work. What confuses me is that the docs define the update method as: Query#update([criteria], [doc], [options], [callback]) but then sometimes use it without the criteria and directly pass the doc: Model.where({ _id: id }).update({ title: 'words' })

JohnnyHK Over a year ago

@velop The update will use the query criteria already added to the Query (e.g. from the where call in your example) if you don't provide it in the update call itself.

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