backend/internal/model/notification.go

package model

import (
	"time"

	"gorm.io/gorm"
)

// NotificationType 通知类型
type NotificationType string

const (
	NotificationTypeLikePost    NotificationType = "like_post"
	NotificationTypeLikeComment NotificationType = "like_comment"
	NotificationTypeComment     NotificationType = "comment"
	NotificationTypeReply       NotificationType = "reply"
	NotificationTypeFollow      NotificationType = "follow"
	NotificationTypeMention     NotificationType = "mention"
	NotificationTypeSystem      NotificationType = "system"
)

// Notification 通知实体
type Notification struct {
	ID      string           `json:"id" gorm:"type:varchar(36);primaryKey"`
	UserID  string           `json:"user_id" gorm:"type:varchar(36);not null;index:idx_notifications_user_read_created,priority:1"` // 接收者
	Type    NotificationType `json:"type" gorm:"type:varchar(30);not null"`
	Title   string           `json:"title" gorm:"type:varchar(200);not null"`
	Content string           `json:"content" gorm:"type:text"`
	Data    string           `json:"data" gorm:"type:jsonb"` // 相关数据（JSON）

	// 已读状态
	IsRead bool       `json:"is_read" gorm:"default:false;index:idx_notifications_user_read_created,priority:2"`
	ReadAt *time.Time `json:"read_at" gorm:"type:timestamp"`

	// 软删除
	DeletedAt gorm.DeletedAt `json:"-" gorm:"index"`

	// 时间戳
	CreatedAt time.Time `json:"created_at" gorm:"autoCreateTime;index:idx_notifications_user_read_created,priority:3,sort:desc"`
}

// BeforeCreate 创建前生成UUID
func (n *Notification) BeforeCreate(tx *gorm.DB) error {
	SetUUIDIfEmpty(&n.ID)
	return nil
}

func (Notification) TableName() string {
	return "notifications"
}