Add sorting by performer age (#6009)

pkg/sqlite/scene.go

@@ -1100,6 +1100,7 @@ var sceneSortOptions = sortOptions{
 	"tag_count",
 	"title",
 	"updated_at",
+	"performer_age",
 }
 
 func (qb *SceneStore) setSceneSort(query *queryBuilder, findFilter *models.FindFilterType) error {
@@ -1209,6 +1210,29 @@ func (qb *SceneStore) setSceneSort(query *queryBuilder, findFilter *models.FindF
 		query.sortAndPagination += fmt.Sprintf(" ORDER BY (SELECT MAX(o_date) FROM %s AS sort WHERE sort.%s = %s.id) %s", scenesODatesTable, sceneIDColumn, sceneTable, getSortDirection(direction))
 	case "o_counter":
 		query.sortAndPagination += getCountSort(sceneTable, scenesODatesTable, sceneIDColumn, direction)
+	case "performer_age":
+		// Looking at the youngest performer by default
+		aggregation := "MIN"
+		if direction == "DESC" {
+			// When sorting by performer_'s age DESC, I should consider the oldest performer instead
+			aggregation = "MAX"
+		}
+		fallback := "NULL"
+		if direction == "ASC" {
+			// When sorting ascending, NULLs are first by default. Coalescing to the MAX int value supported by sqlite
+			fallback = "9223372036854775807"
+		}
+		query.sortAndPagination += fmt.Sprintf(
+			" ORDER BY (SELECT COALESCE(%s(JulianDay(scenes.date) - JulianDay(performers.birthdate)), %s) FROM %s as performers INNER JOIN %s AS aggregation WHERE performers.id = aggregation.%s AND aggregation.%s = %s.id) %s",
+			aggregation,
+			fallback,
+			performerTable,
+			performersScenesTable,
+			performerIDColumn,
+			sceneIDColumn,
+			sceneTable,
+			getSortDirection(direction),
+		)
 	case "studio":
 		query.join(studioTable, "", "scenes.studio_id = studios.id")
 		query.sortAndPagination += getSort("name", direction, studioTable)

pkg/sqlite/scene_test.go

@@ -4131,6 +4131,13 @@ func TestSceneQuerySorting(t *testing.T) {
 			sceneIDs[sceneIdx1WithPerformer],
 			-1,
 		},
+		{
+			"performer_age",
+			"performer_age",
+			models.SortDirectionEnumDesc,
+			-1,
+			-1,
+		},
 	}
 
 	qb := db.Scene

ui/v2.5/src/models/list-filter/scenes.ts

@@ -53,6 +53,7 @@ const sortByOptions = [
   "interactive",
   "interactive_speed",
   "perceptual_similarity",
+  "performer_age",
   "studio",
   ...MediaSortByOptions,
 ]