Initial backend repository commit.

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

Made-with: Cursor

internal/model/group.go

@@ -0,0 +1,57 @@
+package model
+
+import (
+	"strconv"
+	"time"
+
+	"carrot_bbs/internal/pkg/utils"
+
+	"gorm.io/gorm"
+)
+
+// JoinType 群组加入类型
+type JoinType int
+
+const (
+	JoinTypeAnyone    JoinType = 0 // 允许任何人加入
+	JoinTypeApproval  JoinType = 1 // 需要审批
+	JoinTypeForbidden JoinType = 2 // 不允许加入
+)
+
+// Group 群组模型
+type Group struct {
+	ID          string    `gorm:"primaryKey;size:20" json:"id"`
+	Name        string    `gorm:"size:50;not null" json:"name"`
+	Avatar      string    `gorm:"size:512" json:"avatar"`
+	Description string    `gorm:"size:500" json:"description"`
+	OwnerID     string    `gorm:"type:varchar(36);not null;index" json:"owner_id"`
+	MemberCount int       `gorm:"default:0" json:"member_count"`
+	MaxMembers  int       `gorm:"default:500" json:"max_members"`
+	JoinType    JoinType  `gorm:"default:0" json:"join_type"`    // 0:允许任何人加入 1:需要审批 2:不允许加入
+	MuteAll     bool      `gorm:"default:false" json:"mute_all"` // 全员禁言
+	CreatedAt   time.Time `json:"created_at"`
+	UpdatedAt   time.Time `json:"updated_at"`
+}
+
+// BeforeCreate 创建前生成雪花算法ID
+func (g *Group) BeforeCreate(tx *gorm.DB) error {
+	if g.ID == "" {
+		id, err := utils.GetSnowflake().GenerateID()
+		if err != nil {
+			return err
+		}
+		g.ID = strconv.FormatInt(id, 10)
+	}
+	return nil
+}
+
+// GetIDInt 获取数字类型的ID（用于比较）
+func (g *Group) GetIDInt() uint64 {
+	id, _ := strconv.ParseUint(g.ID, 10, 64)
+	return id
+}
+
+// TableName 指定表名
+func (Group) TableName() string {
+	return "groups"
+}