Meteor: Form a fresh collection using a single attribute from a current collection

In my Meteor app, I have a collection 

fullList = new Mongo.Collection('fullList');
. This collection consists of an array of objects with attributes like Color, Factor, and Tot.

My goal is to create a new collection or array that specifically contains all the Tot values from the existing collection. The pseudo-code for this would be something like newList = fullList.Color.

While I can display one attribute in HTML using {{Color}}, I am struggling to manipulate it in JavaScript.

The reason behind creating this new array is to utilize D3.js for visualizing the data.

javascriptmongodbmeteor

Answer №1

It appears that your collection consists of serialized objects, rather than a single-document collection storing an array. In this scenario, you can utilize the map function built into your collection cursor. Details can be found in the documentation linked below:

To implement this, you can do the following (utilizing only the document argument in the callback):

fullList = new Mongo.Collection('fullList');
newlist = fullList.find().map(function(document) {
  return document.Tot;
});

The map() method will cycle through all documents within the collection - since no arguments are specified for find() - and for each document, it will append an element to an array (stored in newList) based on the value returned by the callback function, such as Tot.

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