Lookback API remove unauthorized snapshots - rally

Question

When I ran into issues with a query to the lbapi, I took a step back a created a very basic app with just the query in it that logged the results.
It looked something like this:
Deft.Chain.pipeline([
function() {
var dd = Ext.create('Deft.Deferred');
Ext.create('Rally.data.lookback.SnapshotStore', {
fetch : ['Parent', 'Feature'],
filters : [{
property : '__At',
value : 'current'
},{
property : '_TypeHierarchy',
value : 'HierarchicalRequirement'
}]
}).load({
params : {
compress : true,
removeUnauthorizedSnapshots : true
},
callback : function(store) {
console.log('store',store);
dd.resolve(store);
}
});
return dd.promise;
}
]).then({
success: function(records) {
console.log('records', records);
}
});
Strangely, if I added a filter like this:
{
property : 'Parent',
operator : '!=',
value : null
}
I got more results. I concluded that the removeUnauthorizedSnapshots must filter the results after they have all been gathered into a page of 20000 results, and thus this would be possible. Can anyone confirm this? Hopefully such confusion can be avoided in the future

Answer 1

You are correct.
removeUnauthorizedSnapshots filters the current pagesize set of results, which means it might actually return a page with 0 results in an extreme case when all results are or were once associated with projects that the user is not allowed to access.
I am not sure about the outcome when you got more results. Additional filter should only limit the number of results further, and I see further reduction when I use a similar code.
But I would like to suggest a syntax change for the filter on Parent property. Nulls are not storied in Lookback API at all, so any != null or == null queries are a little misleading. In your code it works, but in the case of Parent == null, it will return snapshots that don't have a Parent attribute, not just those that have a Parent attribute that is null. You may use exists true instead of != null
filters : [
{
property : 'Parent',
operator : 'exists',
value : true
},{
property : '__At',
value : 'current'
},{
property : '_TypeHierarchy',
value : 'HierarchicalRequirement'
}]