From 6e38a2c2d510a6823ad7b73c7e9321c8f7ceaff8 Mon Sep 17 00:00:00 2001
From: Jinzhu <wosmvp@gmail.com>
Date: Sun, 6 Sep 2020 10:51:21 +0800
Subject: [PATCH] Fix many2many join table name rule

---
 schema/naming.go            | 4 ++++
 schema/relationship_test.go | 8 ++++----
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/schema/naming.go b/schema/naming.go
index 9b7c9471..ecdab791 100644
--- a/schema/naming.go
+++ b/schema/naming.go
@@ -41,6 +41,10 @@ func (ns NamingStrategy) ColumnName(table, column string) string {
 
 // JoinTableName convert string to join table name
 func (ns NamingStrategy) JoinTableName(str string) string {
+	if strings.ToLower(str) == str {
+		return str
+	}
+
 	if ns.SingularTable {
 		return ns.TablePrefix + toDBName(str)
 	}
diff --git a/schema/relationship_test.go b/schema/relationship_test.go
index f2d63323..b9279b9f 100644
--- a/schema/relationship_test.go
+++ b/schema/relationship_test.go
@@ -206,16 +206,16 @@ func TestMany2ManyOverrideJoinForeignKey(t *testing.T) {
 
 	type User struct {
 		gorm.Model
-		Profiles []Profile `gorm:"many2many:user_profiles;JoinForeignKey:UserReferID;JoinReferences:ProfileRefer"`
+		Profiles []Profile `gorm:"many2many:user_profile;JoinForeignKey:UserReferID;JoinReferences:ProfileRefer"`
 		Refer    uint
 	}
 
 	checkStructRelation(t, &User{}, Relation{
 		Name: "Profiles", Type: schema.Many2Many, Schema: "User", FieldSchema: "Profile",
-		JoinTable: JoinTable{Name: "user_profiles", Table: "user_profiles"},
+		JoinTable: JoinTable{Name: "user_profile", Table: "user_profile"},
 		References: []Reference{
-			{"ID", "User", "UserReferID", "user_profiles", "", true},
-			{"ID", "Profile", "ProfileRefer", "user_profiles", "", false},
+			{"ID", "User", "UserReferID", "user_profile", "", true},
+			{"ID", "Profile", "ProfileRefer", "user_profile", "", false},
 		},
 	})
 }