From 22f2e33d659d45973bce5bd4e21044ab5f88faf1 Mon Sep 17 00:00:00 2001
From: Kaarel Raspel <kaarel.raspel@gmail.com>
Date: Fri, 11 Dec 2020 00:19:05 +0200
Subject: [PATCH] Fix use cases for `clause.Eq` and `clause.Neq` when value is
 nil pointer of a primitive type

---
 clause/expression.go | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/clause/expression.go b/clause/expression.go
index b30c46b0..3844d66b 100644
--- a/clause/expression.go
+++ b/clause/expression.go
@@ -203,7 +203,7 @@ type Eq struct {
 func (eq Eq) Build(builder Builder) {
 	builder.WriteQuoted(eq.Column)
 
-	if eq.Value == nil {
+	if eqNil(eq.Value) {
 		builder.WriteString(" IS NULL")
 	} else {
 		builder.WriteString(" = ")
@@ -221,7 +221,7 @@ type Neq Eq
 func (neq Neq) Build(builder Builder) {
 	builder.WriteQuoted(neq.Column)
 
-	if neq.Value == nil {
+	if eqNil(neq.Value) {
 		builder.WriteString(" IS NOT NULL")
 	} else {
 		builder.WriteString(" <> ")
@@ -299,3 +299,12 @@ func (like Like) NegationBuild(builder Builder) {
 	builder.WriteString(" NOT LIKE ")
 	builder.AddVar(builder, like.Value)
 }
+
+func eqNil(value interface{}) bool {
+	return value == nil || eqNilReflect(value)
+}
+
+func eqNilReflect(value interface{}) bool {
+	reflectValue := reflect.ValueOf(value)
+	return reflectValue.Kind() == reflect.Ptr && reflectValue.IsNil()
+}