From 06d534d6eaa7f8534e51742b9930818511aaf28c Mon Sep 17 00:00:00 2001
From: Jinzhu <wosmvp@gmail.com>
Date: Tue, 15 Sep 2020 12:41:45 +0800
Subject: [PATCH] Cascade delete associations, close #3473

---
 callbacks/delete.go | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/callbacks/delete.go b/callbacks/delete.go
index 510dfae4..549a94e7 100644
--- a/callbacks/delete.go
+++ b/callbacks/delete.go
@@ -34,8 +34,23 @@ func DeleteBeforeAssociations(db *gorm.DB) {
 							queryConds := rel.ToQueryConditions(db.Statement.ReflectValue)
 							modelValue := reflect.New(rel.FieldSchema.ModelType).Interface()
 							tx := db.Session(&gorm.Session{}).Model(modelValue)
-							if db.AddError(tx.Clauses(clause.Where{Exprs: queryConds}).Delete(modelValue).Error) != nil {
-								return
+							withoutConditions := false
+
+							if len(db.Statement.Selects) > 0 {
+								tx = tx.Select(db.Statement.Selects)
+							}
+
+							for _, cond := range queryConds {
+								if c, ok := cond.(clause.IN); ok && len(c.Values) == 0 {
+									withoutConditions = true
+									break
+								}
+							}
+
+							if !withoutConditions {
+								if db.AddError(tx.Clauses(clause.Where{Exprs: queryConds}).Delete(modelValue).Error) != nil {
+									return
+								}
 							}
 						case schema.Many2Many:
 							var (