Switching sort method

builder/openstack/image_query.go

@@ -8,7 +8,8 @@ import (
 )
 
 const (
-	mostRecentSort = "created_at:desc"
+	mostRecentSortDir = "desc"
+	mostRecentSortKey = "created_at"
 )
 
 var validFields = map[string]string{
@@ -99,7 +100,8 @@ func buildImageFilters(input map[string]interface{}, listOpts *images.ListOpts)
 func applyMostRecent(listOpts *images.ListOpts) {
 	// Sort isn't supported through our API so there should be no existing values.
 	// Overwriting .Sort is okay.
-	listOpts.Sort = mostRecentSort
+	listOpts.SortKey = mostRecentSortKey
+	listOpts.SortDir = mostRecentSortDir
 	listOpts.Limit = 1
 
 	return

builder/openstack/image_query_test.go

@@ -78,7 +78,7 @@ func TestApplyMostRecent(t *testing.T) {
 
 	applyMostRecent(&testSortOpts)
 
-	if testSortOpts.Sort != "created_at:desc" {
+	if testSortOpts.SortKey != "created_at" || testSortOpts.SortDir != "desc" {
 		t.Errorf("Error applying most recent filter: sort")
 	}
 }