Change preloader query function interface

mongox/database/database.go

@@ -129,7 +129,7 @@ func (d *Database) createAggregateLoad(target interface{}, composed *query.Query
 	el := reflect.ValueOf(target).Elem()
 	elType := el.Type()
 	numField := elType.NumField()
-	_, preloads := composed.Preloader()
+	preloads, _ := composed.Preloader()
 
 	for i := 0; i < numField; i++ {
 

mongox/database/loadarray.go

@@ -37,7 +37,7 @@ func (d *Database) LoadArray(target interface{}, filters ...interface{}) (err er
 	}
 
 	zeroElem := reflect.Zero(targetSliceElemT)
-	hasPreloader, _ := composed.Preloader()
+	_, hasPreloader := composed.Preloader()
 	ctx := query.WithContext(d.Context(), composed)
 
 	var result *mongox.Cursor

mongox/database/loadone.go

@@ -16,7 +16,7 @@ func (d *Database) LoadOne(target interface{}, filters ...interface{}) (err erro
 		return
 	}
 
-	hasPreloader, _ := composed.Preloader()
+	_, hasPreloader := composed.Preloader()
 	ctx := query.WithContext(d.Context(), composed)
 
 	var result *mongox.Cursor

mongox/database/loadstream.go

@@ -15,7 +15,7 @@ func (d *Database) LoadStream(target interface{}, filters ...interface{}) (loade
 		return
 	}
 
-	hasPreloader, _ := composed.Preloader()
+	_, hasPreloader := composed.Preloader()
 	ctx := query.WithContext(d.Context(), composed)
 
 	var cursor *mongox.Cursor

mongox/query/query.go

@@ -76,10 +76,10 @@ func (q *Query) Updater() (update primitive.A) {
 }
 
 // Preloader is a preloader list for a query
-func (q *Query) Preloader() (ok bool, preloads []string) {
+func (q *Query) Preloader() (preloads []string, ok bool) {
 
 	if q.preloader == nil {
-		return false, nil
+		return nil, false
 	}
 
 	preloads = q.preloader.Preload()