meteor - How do I modify the item of an array passed as data context in a child template? -

i have local collection stores arrays of odds:

checkscollection = new mongo.collection(null); checkscollection.insert({   odds: ['', ''],   oddsaverages: ['', ''],   oddscompeting: ['', ''] }); 

and helper sets parent data context:

template.step1.helpers({   bet: () => checkscollection.findone() }); 

and need child template can modify index of array checkscollection. @ moment call that:

{{>inputodds odds=bet.odds.[0] label='the odds being offered you:' placeholder='any odds style works! equivalent examples: 1/4   1.25   -400'}}  {{>inputodds odds=bet.odds.[1] label='the odds offered opposite outcome:' placeholder=''}} 

later might call {{#each ... in ...}} loop through oddsaverages example. child template:

<template name="inputodds">   <div class="form-group">     <label for="odds">{{label}}</label>     <input type="text" class="form-control" id="odds" value="{{odds}}"              placeholder="{{placeholder}}">   </div> </template> 

putting more simply, question modify , write after lines below in order allow child template update data context (therefore call update , modify values arrays of checkscollection):

template.inputodds.events({   'keyup input.form-control': function (event, template) { 

i have solved yey! if in same situation, use following code:

var objectforset = {}; objectforset[key + '.' + index] = value; //todo remove debugging code below. line creates rendering problem is: checkscollection.update({}, {$set: objectforset}); console.log(`modifying local collection @ key: ${key}; array index: ${index};`); checkscollection.update({}, {$set: objectforset});