fix(scan): array element is set to a zero value (#6890)

* fix(scan): array element is set to a zero value

* add test

* fix test

* optimization

scan.go

@@ -274,7 +274,9 @@ func Scan(rows Rows, db *DB, mode ScanMode) {
 
 			if !update || reflectValue.Len() == 0 {
 				update = false
-				if !isArrayKind {
+				if isArrayKind {
+					db.Statement.ReflectValue.Set(reflect.Zero(reflectValue.Type()))
+				} else {
 					// if the slice cap is externally initialized, the externally initialized slice is directly used here
 					if reflectValue.Cap() == 0 {
 						db.Statement.ReflectValue.Set(reflect.MakeSlice(reflectValue.Type(), 0, 20))

tests/query_test.go

@@ -1409,3 +1409,22 @@ func TestQueryError(t *testing.T) {
 	}, Value: 1}).Scan(&p2).Error
 	AssertEqual(t, err, gorm.ErrModelValueRequired)
 }
+
+func TestQueryScanToArray(t *testing.T) {
+	err := DB.Create(&User{Name: "testname1", Age: 10}).Error
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	users := [2]*User{{Name: "1"}, {Name: "2"}}
+	err = DB.Model(&User{}).Where("name = ?", "testname1").Find(&users).Error
+	if err != nil {
+		t.Fatal(err)
+	}
+	if users[0] == nil || users[0].Name != "testname1" {
+		t.Error("users[0] not covere")
+	}
+	if users[1] != nil {
+		t.Error("users[1] should be empty")
+	}
+}