How to batch update with meteor

I want to update multi document in client
Messages.update({ _id: { $in: selectedMessages } },{$set:{ state: "outbox"}},{multi: true}, function (e, t) { console.log("e : " + JSON.stringify(e)); console.log("t : " + JSON.stringify(t)); });
this is not working and how to do it ??
thanks for your attention

You can only update single documents on the client. You have to move that to the server and call it through a Meteor.method.

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