fix: preload panic when model and dest different

callbacks/query.go

@@ -218,6 +218,13 @@ func Preload(db *gorm.DB) {
 		}
 		sort.Strings(preloadNames)
 
+		// different schema
+		if db.Statement.ReflectValue.CanAddr() && db.Statement.Dest != db.Statement.Model {
+			if err := db.Statement.Parse(db.Statement.Dest); err != nil {
+				db.AddError(err)
+			}
+		}
+
 		for _, name := range preloadNames {
 			if rel := db.Statement.Schema.Relationships.Relations[name]; rel != nil {
 				preload(db, rel, append(db.Statement.Preloads[name], db.Statement.Preloads[clause.Associations]...), preloadMap[name])

tests/preload_test.go

@@ -251,3 +251,20 @@ func TestPreloadGoroutine(t *testing.T) {
 	}
 	wg.Wait()
 }
+
+func TestPreloadWithDiffModel(t *testing.T) {
+	user := *GetUser("preload_with_diff_model", Config{Account: true})
+
+	if err := DB.Create(&user).Error; err != nil {
+		t.Fatalf("errors happened when create: %v", err)
+	}
+
+	CheckUser(t, user, user)
+
+	var result struct {
+		Something string
+		User
+	}
+	DB.Model(&User{}).Select("users.*, 'yo' as something").Preload("Account").Find(&result, user.ID)
+	CheckUser(t, user, result.User)
+}