Add element to array collections.update in meteor

Question

    Polls.update({_id: id}, {$set : {already_voted[length]: ip});

Now this obviously doesn't work. I can't simply put a variable "length" in there.

Basically I have already_voted which is an array and I want to add a new ip to this array. The way I handle this currently is by getting the old length and using the old length as the new index to add the element.

I am wondering how I should go about doing this as my current setup does not work.

To clarify : I don't have the whole array, I just want to add a new element into the array in the Poll document.

Do you mean you "have" the whole array and you want to add the member that is not present in the stored document array? It's not really clear what you are saying. — Neil Lunn
– Neil Lunn, Commented Feb 20, 2014 at 12:14
I don't have the whole array. I just have a value that I want to add into an array called already_voted in my Polls documents. — user1952811
– user1952811, Commented Feb 20, 2014 at 12:20

Andrey · Accepted Answer · 2015-06-30 14:03:21Z

30

Use the $push Mongo operator:

Polls.update({ _id: id },{ $push: { already_voted: ip }})

See the docs here.

edited Jun 30, 2015 at 14:03

Andrey

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answered Feb 20, 2014 at 12:21

Tobias

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Neil Lunn Over a year ago

Better yet. Combine that with $set in case it's a new document, adding upsert

mokk · Accepted Answer · 2017-02-25 14:59:51Z

2

It is quite easy to add element to array in collection in meteor:

collection.update({_id: "unique id"},{$push:{already_voted: ip}});

You can even user upsert instead of update as per you requirement. something like this:

collection.upsert({_id: "unique id"},{$push:{already_voted: ip}});

edited Feb 25, 2017 at 14:59

mokk

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answered Jan 12, 2016 at 10:49

Ashwini Shelke

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AdrianHHH Over a year ago

Welcome to Stack Overflow. Your answer appears to be very similar to the existing and accepted answer, plus its comments. A new answer to an old question should add new information if it is to be useful. Please read the How to Answer pages to see how to write a good answer.

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