69 lines
3.9 KiB
Go
69 lines
3.9 KiB
Go
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package model
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import (
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"strconv"
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"time"
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"gorm.io/gorm"
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"carrot_bbs/internal/pkg/utils"
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)
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// ConversationType 会话类型
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type ConversationType string
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const (
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ConversationTypePrivate ConversationType = "private" // 私聊
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ConversationTypeGroup ConversationType = "group" // 群聊
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ConversationTypeSystem ConversationType = "system" // 系统通知会话
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)
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// Conversation 会话实体
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// 使用雪花算法ID（作为string存储）和seq机制实现消息排序和增量同步
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type Conversation struct {
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ID string `gorm:"primaryKey;size:20" json:"id"` // 雪花算法ID（转为string避免精度丢失）
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Type ConversationType `gorm:"type:varchar(20);default:'private'" json:"type"` // 会话类型
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GroupID *string `gorm:"index" json:"group_id,omitempty"` // 关联的群组ID（群聊时使用，string类型避免JS精度丢失）；使用指针支持NULL值
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LastSeq int64 `gorm:"default:0" json:"last_seq"` // 最后一条消息的seq
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LastMsgTime *time.Time `json:"last_msg_time,omitempty"` // 最后消息时间
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CreatedAt time.Time `json:"created_at" gorm:"autoCreateTime"`
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UpdatedAt time.Time `json:"updated_at" gorm:"autoUpdateTime"`
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// 关联 - 使用 polymorphic 模式避免外键约束问题
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Participants []ConversationParticipant `gorm:"foreignKey:ConversationID" json:"participants,omitempty"`
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Group *Group `gorm:"foreignKey:GroupID;references:ID" json:"group,omitempty"`
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}
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// BeforeCreate 创建前生成雪花算法ID
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func (c *Conversation) BeforeCreate(tx *gorm.DB) error {
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if c.ID == "" {
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id, err := utils.GetSnowflake().GenerateID()
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if err != nil {
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return err
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}
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c.ID = strconv.FormatInt(id, 10)
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}
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return nil
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}
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func (Conversation) TableName() string {
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return "conversations"
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}
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// ConversationParticipant 会话参与者
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type ConversationParticipant struct {
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ID uint `gorm:"primaryKey" json:"id"`
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ConversationID string `gorm:"not null;size:20;uniqueIndex:idx_conversation_user,priority:1;index:idx_cp_conversation_user,priority:1" json:"conversation_id"` // 雪花算法ID（string类型）
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UserID string `gorm:"column:user_id;type:varchar(50);not null;uniqueIndex:idx_conversation_user,priority:2;index:idx_cp_conversation_user,priority:2;index:idx_cp_user_hidden_pinned_updated,priority:1" json:"user_id"` // UUID格式，与JWT中user_id保持一致
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LastReadSeq int64 `gorm:"default:0" json:"last_read_seq"` // 已读到的seq位置
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Muted bool `gorm:"default:false" json:"muted"` // 是否免打扰
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IsPinned bool `gorm:"default:false;index:idx_cp_user_hidden_pinned_updated,priority:3" json:"is_pinned"` // 是否置顶会话（用户维度）
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HiddenAt *time.Time `gorm:"index:idx_cp_user_hidden_pinned_updated,priority:2" json:"hidden_at,omitempty"` // 仅自己删除会话时使用，收到新消息后自动恢复
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CreatedAt time.Time `json:"created_at" gorm:"autoCreateTime"`
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UpdatedAt time.Time `json:"updated_at" gorm:"autoUpdateTime;index:idx_cp_user_hidden_pinned_updated,priority:4,sort:desc"`
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}
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func (ConversationParticipant) TableName() string {
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return "conversation_participants"
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}
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