package entity import "github.com/jinzhu/gorm" type PhotoKeyword struct { PhotoID uint `gorm:"primary_key;auto_increment:false"` KeywordID uint `gorm:"primary_key;auto_increment:false;index"` } func (PhotoKeyword) TableName() string { return "photos_keywords" } func NewPhotoKeyword(photoID, keywordID uint) *PhotoKeyword { result := &PhotoKeyword{ PhotoID: photoID, KeywordID: keywordID, } return result } func (m *PhotoKeyword) FirstOrCreate(db *gorm.DB) *PhotoKeyword { if err := db.FirstOrCreate(m, "photo_id = ? AND keyword_id = ?", m.PhotoID, m.KeywordID).Error; err != nil { log.Errorf("photo keyword: %s", err) } return m }