How to update an meteor collection array

[Seba]

Hello :)

I want to update an array (meteor, mongodb). I can add some values to the array, but I can't update an specific position in the array like the fifth.

That's my array:

points: [5,4,8,3,4,0]

Here is my not working code:

Books.update({_id:"selected_player"}, {$addToSet: {points[5]: 17}});

I want to add the number 17 to field 5

[James Wilson]

try 

Books.update('RZQ8M8ooXyF9Bxdcv', {$addToSet: {points[5]: 17}});

or similar as the first argument should be a collectionObject._id string property.

James Wilson

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[Arunoda Susiripala]

try these as well: http://docs.mongodb.org/manual/reference/operator/#id3

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Arunoda Susiripala

@arunoda

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[Seba]

Hi James,

the problem is not the _id. The problem is [5], because of this error in JavaScript console:

Uncaught SyntaxError: Unexpected token ]

[Seba]

Hi :)

It doesn't matter which operator (addToSet or push) I'm using. It's always the same.

with:

Books.update({_id:"selected_player"}, {$addToSet: {points[5]: 17}});

or:

Books.update({_id:"selected_player"}, {$push: {points[5]: 17}});

It doesn't work and if I try this:

Books.update({_id:"selected_player"}, {$addToSet: {points: 17}});

I get this:

points: [5,4,8,3,4,0, 17]

but I want this:

points: [5,4,8,3,4,17]

Sorry for my bad english, I  hope I could explain my problem to you.

[Barrett Snyder]

I'm new to meteor and could be wrong on this, but I think you may need to manually modify the array then $set the entire array on the player object.

function updatePlayerPoints(player_id, points_idx, point_val) {

var p = players.findOne({"_id":player_id});
if (p&&p.points) {

p.points[points_idx] = point_val;
players.update({"_id":player_id},{$set:{"points":p.points}});

}

};

Then call it with:
updatePlayerPoints(Session.get('selected_player'), 5, 17);

[Seb]

I'm shocked. I can't believe that it is so complicated. 

Is there no other way to insert/update a value to a specific field in an array? 

[Seb]

Here is the solution:

Books.update({_id:"selected_player"}, {$set: {"points.5": 17}});

[Barrett Snyder]

Cool, that's much easier! :)