From 42999e980916d8a5ee257eb116a351bceace691f Mon Sep 17 00:00:00 2001
From: Jinzhu <wosmvp@gmail.com>
Date: Thu, 4 Mar 2021 18:28:32 +0800
Subject: [PATCH] Fix overwrite preloading associations, close #4134

---
 callbacks/query.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/callbacks/query.go b/callbacks/query.go
index 5a97e1ad..658216df 100644
--- a/callbacks/query.go
+++ b/callbacks/query.go
@@ -172,7 +172,9 @@ func Preload(db *gorm.DB) {
 			if name == clause.Associations {
 				for _, rel := range db.Statement.Schema.Relationships.Relations {
 					if rel.Schema == db.Statement.Schema {
-						preloadMap[rel.Name] = map[string][]interface{}{}
+						if _, ok := preloadMap[rel.Name]; !ok {
+							preloadMap[rel.Name] = map[string][]interface{}{}
+						}
 					}
 				}
 			} else {