fix: many2many auto migrate (#5322)

* fix: many2many auto migrate

* fix: uuid ossp

schema/relationship.go

@@ -235,7 +235,8 @@ func (schema *Schema) buildMany2ManyRelation(relation *Relationship, field *Fiel
 			Name:    joinFieldName,
 			PkgPath: ownField.StructField.PkgPath,
 			Type:    ownField.StructField.Type,
-			Tag:     removeSettingFromTag(ownField.StructField.Tag, "column", "autoincrement", "index", "unique", "uniqueindex"),
+			Tag: removeSettingFromTag(appendSettingFromTag(ownField.StructField.Tag, "primaryKey"),
+				"column", "autoincrement", "index", "unique", "uniqueindex"),
 		})
 	}
 
@@ -258,7 +259,8 @@ func (schema *Schema) buildMany2ManyRelation(relation *Relationship, field *Fiel
 			Name:    joinFieldName,
 			PkgPath: relField.StructField.PkgPath,
 			Type:    relField.StructField.Type,
-			Tag:     removeSettingFromTag(relField.StructField.Tag, "column", "autoincrement", "index", "unique", "uniqueindex"),
+			Tag: removeSettingFromTag(appendSettingFromTag(relField.StructField.Tag, "primaryKey"),
+				"column", "autoincrement", "index", "unique", "uniqueindex"),
 		})
 	}
 

schema/utils.go

@@ -2,6 +2,7 @@ package schema
 
 import (
 	"context"
+	"fmt"
 	"reflect"
 	"regexp"
 	"strings"
@@ -59,6 +60,14 @@ func removeSettingFromTag(tag reflect.StructTag, names ...string) reflect.Struct
 	return tag
 }
 
+func appendSettingFromTag(tag reflect.StructTag, value string) reflect.StructTag {
+	t := tag.Get("gorm")
+	if strings.Contains(t, value) {
+		return tag
+	}
+	return reflect.StructTag(fmt.Sprintf(`gorm:"%s;%s"`, value, t))
+}
+
 // GetRelationsValues get relations's values from a reflect value
 func GetRelationsValues(ctx context.Context, reflectValue reflect.Value, rels []*Relationship) (reflectResults reflect.Value) {
 	for _, rel := range rels {

tests/migrate_test.go

@@ -657,3 +657,39 @@ func TestMigrateWithSpecialName(t *testing.T) {
 	AssertEqual(t, true, DB.Migrator().HasTable("coupon_product_1"))
 	AssertEqual(t, true, DB.Migrator().HasTable("coupon_product_2"))
 }
+
+// https://github.com/go-gorm/gorm/issues/5320
+func TestPrimarykeyID(t *testing.T) {
+	if DB.Dialector.Name() != "postgres" {
+		return
+	}
+
+	type MissPKLanguage struct {
+		ID   string `gorm:"type:uuid;default:uuid_generate_v4()"`
+		Name string
+	}
+
+	type MissPKUser struct {
+		ID              string           `gorm:"type:uuid;default:uuid_generate_v4()"`
+		MissPKLanguages []MissPKLanguage `gorm:"many2many:miss_pk_user_languages;"`
+	}
+
+	var err error
+	err = DB.Migrator().DropTable(&MissPKUser{}, &MissPKLanguage{})
+	if err != nil {
+		t.Fatalf("DropTable err:%v", err)
+	}
+
+	DB.Exec(`CREATE EXTENSION IF NOT EXISTS "uuid-ossp";`)
+
+	err = DB.AutoMigrate(&MissPKUser{}, &MissPKLanguage{})
+	if err != nil {
+		t.Fatalf("AutoMigrate err:%v", err)
+	}
+
+	// patch
+	err = DB.AutoMigrate(&MissPKUser{}, &MissPKLanguage{})
+	if err != nil {
+		t.Fatalf("AutoMigrate err:%v", err)
+	}
+}