Error code standardization

pkg/common/db/relation/black_model.go

@@ -12,10 +12,8 @@ type BlackGorm struct {
 	DB *gorm.DB
 }
 
-func NewBlackGorm(db *gorm.DB) *BlackGorm {
-	var black BlackGorm
-	black.DB = db
-	return &black
+func NewBlackGorm(db *gorm.DB) relation.BlackModelInterface {
+	return &BlackGorm{db}
 }
 
 func (b *BlackGorm) Create(ctx context.Context, blacks []*relation.BlackModel) (err error) {

pkg/common/db/relation/friend_model.go

@@ -8,11 +8,6 @@ import (
 	"gorm.io/gorm"
 )
 
-type FriendUser struct {
-	FriendGorm
-	Nickname string `gorm:"column:name;size:255"`
-}
-
 type FriendGorm struct {
 	DB *gorm.DB
 }