Fix join table foreign key in snake_case

schema/relationship.go

@@ -210,7 +210,7 @@ func (schema *Schema) buildMany2ManyRelation(relation *Relationship, field *Fiel
 	for idx, ownField := range ownForeignFields {
 		joinFieldName := schema.Name + ownField.Name
 		if len(joinForeignKeys) > idx {
-			joinFieldName = joinForeignKeys[idx]
+			joinFieldName = strings.Title(joinForeignKeys[idx])
 		}
 
 		ownFieldsMap[joinFieldName] = true
@@ -226,7 +226,7 @@ func (schema *Schema) buildMany2ManyRelation(relation *Relationship, field *Fiel
 	for idx, relField := range refForeignFields {
 		joinFieldName := relation.FieldSchema.Name + relField.Name
 		if len(joinReferences) > idx {
-			joinFieldName = joinReferences[idx]
+			joinFieldName = strings.Title(joinReferences[idx])
 		}
 
 		if _, ok := ownFieldsMap[joinFieldName]; ok {

schema/relationship_test.go

@@ -139,6 +139,7 @@ func TestMany2ManyOverrideForeignKeyAndReferences(t *testing.T) {
 	type User struct {
 		gorm.Model
 		Profiles  []Profile `gorm:"many2many:user_profiles;ForeignKey:Refer;JoinForeignKey:UserReferID;References:UserRefer;JoinReferences:ProfileRefer"`
+		Profiles2 []Profile `gorm:"many2many:user_profiles2;ForeignKey:refer;JoinForeignKey:user_refer_id;References:user_refer;JoinReferences:profile_refer"`
 		Refer     uint
 	}
 
@@ -149,6 +150,13 @@ func TestMany2ManyOverrideForeignKeyAndReferences(t *testing.T) {
 			{"Refer", "User", "UserReferID", "user_profiles", "", true},
 			{"UserRefer", "Profile", "ProfileRefer", "user_profiles", "", false},
 		},
+	}, Relation{
+		Name: "Profiles2", Type: schema.Many2Many, Schema: "User", FieldSchema: "Profile",
+		JoinTable: JoinTable{Name: "user_profiles2", Table: "user_profiles2"},
+		References: []Reference{
+			{"Refer", "User", "User_refer_id", "user_profiles2", "", true},
+			{"UserRefer", "Profile", "Profile_refer", "user_profiles2", "", false},
+		},
 	})
 }