using Lookback API how to find tasks that did not have a change in ToDo?

Question

I am writing an app that shows a grid of tasks, filtered by iteration, where ToDo has not been modified within certain time frame. Per documentation Iterations on Tasks are not available in LookbackAPI, but there is a second question: how to find tasks that did not have a change in ToDo within a time period specified? Thank you.

Answer 1

You may apply this filter

"_PreviousValues.ToDo":{$exists: false} 

to get snapshots where ToDo was not modified.

This query looks for Tasks in a specific project, and limit the time frame:

https://rally1.rallydev.com/analytics/v2.0/service/rally/workspace/1111/artifact/snapshot/query.js?find={"_ProjectHierarchy":2222,"_TypeHierarchy":"Task","_PreviousValues.ToDo":{$exists: false},_ValidFrom:{$gte: "2014-04-XXTxx:xx:00.000Z",$lt: "2014-04-XXTxx:yy:00.000Z"}}&fields=["_UnformattedID","ToDo","_PreviousValues.ToDo"]

A slightly different "_PreviousValues.ToDo":null returns the task's first snapshot that corresponds to the original revision when ToDo was not set in addition to the same snapshots returned when filtered by "_PreviousValues.ToDo":{$exists: false}

As far as filtering tasks by iteration, you may use Rally.data.wsapi.Store to get ObjectIDs of the tasks filtered by iteration, and then Rally.data.lookback.SnapshotStore filtered by the array of OIDs

{
     property: 'ObjectID',
     operator: 'in',
     value: arr
}

where arr is [123456789, 987654321,...]