package models import ( "time" ) type CartItem struct { ID uint `json:"id" gorm:"primaryKey"` UserID uint `json:"user_id" gorm:"not null;uniqueIndex:idx_user_item"` ItemID uint `json:"item_id" gorm:"not null;uniqueIndex:idx_user_item"` Quantity float64 `json:"quantity" gorm:"not null;default:1"` CreatedAt time.Time `json:"created_at"` UpdatedAt time.Time `json:"updated_at"` Item Item `json:"item" gorm:"foreignKey:ItemID"` }