From 829677486b502e6d5d2ae37814488ae9f2c7386e Mon Sep 17 00:00:00 2001
From: j2gg0s <j2gg0s@gmail.com>
Date: Fri, 3 Jan 2025 13:01:48 +0800
Subject: [PATCH] fix: return error when use dest with has-many/many-to-many

Close #606
---
 query_select.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/query_select.go b/query_select.go
index a0f680ea..201bdce3 100644
--- a/query_select.go
+++ b/query_select.go
@@ -838,6 +838,14 @@ func (q *SelectQuery) scanResult(ctx context.Context, dest ...interface{}) (sql.
 	if err != nil {
 		return nil, err
 	}
+	if len(dest) > 0 && q.tableModel != nil && len(q.tableModel.getJoins()) > 0 {
+		for _, j := range q.tableModel.getJoins() {
+			switch j.Relation.Type {
+			case schema.HasManyRelation, schema.ManyToManyRelation:
+				return nil, fmt.Errorf("When querying has-many or many-to-many relationships, you should use Model instead of the dest parameter in Scan.")
+			}
+		}
+	}
 
 	if q.table != nil {
 		if err := q.beforeSelectHook(ctx); err != nil {