Resolving promises on filter ember for local store only

I am creating some records locally, with the command

store.createRecord('vdpformat',{recordformat:"a",name:f.name});   

Once they are created, I try to get the records which have the value of recordformat=a using the following code.

var totalvdpformats=store.all("vdpformat");
var filteredRecords=totalvdpformats.filterBy("recordformat","a");  

But I get the contents of filtered records as empty as the promise doesn't get resolved.It returns an empty array when I try to console log filteredRecords.

Is there anyway to use a promise on the above?

When I try to add a promise on totalvdpformats, it tells me the function is undefined.

Please help.