Initial backend repository commit.

Set up project files and add .gitignore to exclude local build/runtime artifacts.

Made-with: Cursor

internal/model/group_member.go

@@ -0,0 +1,47 @@
+package model
+
+import (
+	"strconv"
+	"time"
+
+	"carrot_bbs/internal/pkg/utils"
+
+	"gorm.io/gorm"
+)
+
+// GroupMember 群成员模型
+type GroupMember struct {
+	ID        string    `gorm:"primaryKey;size:20" json:"id"`
+	GroupID   string    `gorm:"not null;uniqueIndex:idx_group_user" json:"group_id"`
+	UserID    string    `gorm:"type:varchar(36);not null;uniqueIndex:idx_group_user" json:"user_id"`
+	Role      string    `gorm:"size:20;default:'member'" json:"role"` // owner, admin, member
+	Nickname  string    `gorm:"size:50" json:"nickname"`              // 群内昵称
+	Muted     bool      `gorm:"default:false" json:"muted"`           // 是否被禁言
+	JoinTime  time.Time `json:"join_time"`
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+}
+
+// BeforeCreate 创建前生成雪花算法ID
+func (gm *GroupMember) BeforeCreate(tx *gorm.DB) error {
+	if gm.ID == "" {
+		id, err := utils.GetSnowflake().GenerateID()
+		if err != nil {
+			return err
+		}
+		gm.ID = strconv.FormatInt(id, 10)
+	}
+	return nil
+}
+
+// TableName 指定表名
+func (GroupMember) TableName() string {
+	return "group_members"
+}
+
+// Role 常量
+const (
+	GroupRoleOwner  = "owner"
+	GroupRoleAdmin  = "admin"
+	GroupRoleMember = "member"
+)