Grouping user stories based on release - json

Question

I am able to filter all of the user stories based on a start Release and an end Release, but I now want to group these user stories based on the specific Release they are in. For example, If my start Release is 35 and my end Release is 37, I want to take all the user stories I got from the code below and save them into 35, 36, and 37 based on where they reside. I was thinking if there was a way to loop through each release between two dates and save the data as I go, it would work.
// Filters all user stories between start release date and end release date
var iterationFilters = [
{
property: 'Iteration.StartDate',
operator: '>=',
value: StartDate
},
{
property: 'Iteration.EndDate',
operator: '<=',
value: EndDate
},
];
var defectStore = Ext.create('Rally.data.wsapi.Store', {
model: 'User Story',
autoLoad: true,
filters : iterationFilters,
listeners: {
load: function(myStore, myData) {
console.log(myData)
},
scope: this
},
fetch: ['CreationDate','FormattedID']
});
}

Answer 1

Is the intent to show it in a grid? If so you could use this example to get you pretty close: https://help.rallydev.com/apps/2.1/doc/#!/example/groupable-grid
Otherwise if you just need to manipulate the raw data, I'd just use the groupBy function provided by lodash.
var storiesByRelease = _.groupBy(defectStore.getRange(), function(story) {
return story.get('Release')._refObjectName;
});