CODEWITHSUNDEEP
javascripthtmlmongodbcollectionsmeteor
ToBHo
ToBHo

Reputation: 31

Changing a Meteor.Collection before parsing

I have the following problem: I'm retrieving a Meteor Collection from my Mongo database. This Collection shall be parsed into HTML via built in handlebar.js. Before that I want to either change a value in the Collection without saving it to the db or add a new value to the Collection without saving it.

This is because the inserted data depends on calculations which is done at runtime.

I tried te following:

var topics = Topic.find({}, {sort: {votes: -1}});
var totalUsers = Meteor.users.find({}).count();
topics.forEach(function(topic){
  var numberOfGoodVotes = topic.votes.goodVotes.length;
  var numberOfBadVotes = topic.votes.badVotes.length;
  topic.pctGood = (numberOfGoodVotes*(100/totalUsers));
  topic.pctBad = (numberOfBadVotes*(100/totalUsers));
  topic.pctRest = 100 - topic.pctGood - topic.pctBad;
});

Unfortunately pctGood/Bad/Rest are all 0 which cannot be possible. In this case pctGood/Bad/Rest are stores in my Collection and have the value 0. This is why I assume it is not changed after computation.

My HTML looks like this:

<div style="width: {{pctGood}}%;">{{pctGood}}%</div>
<div style="width: {{pctRest}}%;">{{pctRest}}%</div>
<div style="width: {{pctBad}}%;">{{pctBad}}%</div>

Hope anyone can help :)

Upvotes: 1

Views: 166

Answers (1)

ToBHo
ToBHo

Reputation: 31

Found a working solution. Just add a function to the transform option.

var topics = Topic.find({}, {sort: {votes: -1}, transform: YOURFUNCTIONGOESHERE});

var YOURFUNCTIONGOESHERE = function(topic){
  var totalUsers = Meteor.users.find({}).count();
  var numberOfGoodVotes = topic.votes.goodVotes.length;
  var numberOfBadVotes = topic.votes.badVotes.length;
  topic.pctGood = (numberOfGoodVotes*(100/totalUsers));
  topic.pctBad = (numberOfBadVotes*(100/totalUsers));
  topic.pctRest = 100 - topic.pctGood - topic.pctBad;
  return topic;
}

Upvotes: 1

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