initial commit

category/internal/logic/createcategorylogic.go

@@ -0,0 +1,118 @@
+package logic
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"time"
+
+	"godemo/category/category"
+	"godemo/category/internal/model"
+	"godemo/category/internal/svc"
+
+	"github.com/google/uuid"
+	"github.com/zeromicro/go-zero/core/logx"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+type CreateCategoryLogic struct {
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+	logx.Logger
+}
+
+func NewCreateCategoryLogic(ctx context.Context, svcCtx *svc.ServiceContext) *CreateCategoryLogic {
+	return &CreateCategoryLogic{
+		ctx:    ctx,
+		svcCtx: svcCtx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+func (l *CreateCategoryLogic) CreateCategory(in *category.CreateCategoryRequest) (*category.CategoryInfoResponse, error) {
+	// 参数校验
+	if in.SystemId == "" || in.Name == "" {
+		return nil, status.Error(codes.InvalidArgument, "system_id 和 name 不能为空")
+	}
+
+	// 检查唯一性
+	exists, err := l.checkCategoryExists(in)
+	if err != nil {
+		logx.Error("唯一性检查失败: ", err)
+		return nil, status.Error(codes.Internal, "内部错误")
+	}
+	if exists {
+		return nil, status.Error(codes.AlreadyExists, "分类已存在")
+	}
+
+	// 构建模型
+	newCategory := &model.Categories{
+		Id:          uuid.New().String(),
+		SystemId:    in.SystemId,
+		Name:        in.Name,
+		Alias:       toNullString(in.Alias),
+		ParentId:    toNullString(in.ParentId),
+		Description: toNullString(in.Description),
+		CreatedAt:   time.Now(),
+		UpdatedAt:   sql.NullTime{Time: time.Now(), Valid: true},
+	}
+
+	// 插入数据库
+	if _, err := l.svcCtx.CategoryModel.Insert(l.ctx, newCategory); err != nil {
+		logx.Error("插入失败: ", err)
+		return nil, status.Error(codes.Internal, "创建分类失败")
+	}
+
+	// 返回响应
+	return &category.CategoryInfoResponse{
+		Category: &category.CategoryInfo{
+			Id:          newCategory.Id,
+			SystemId:    newCategory.SystemId,
+			Name:        newCategory.Name,
+			Alias:       in.Alias,
+			ParentId:    in.ParentId,
+			Description: in.Description,
+			CreatedAt:   newCategory.CreatedAt.Unix(),
+			UpdatedAt:   newCategory.UpdatedAt.Time.Unix(),
+		},
+	}, nil
+}
+
+// 空字符串转换为 sql.NullString
+func toNullString(s string) sql.NullString {
+	return sql.NullString{String: s, Valid: s != ""}
+}
+
+// 唯一性检查逻辑
+func (l *CreateCategoryLogic) checkCategoryExists(in *category.CreateCategoryRequest) (bool, error) {
+	// 检查名称唯一性
+	_, err := l.svcCtx.CategoryModel.FindBySystemParentName(
+		l.ctx,
+		in.SystemId,
+		in.ParentId,
+		in.Name,
+	)
+	if err == nil {
+		return true, nil
+	} else if !errors.Is(err, model.ErrNotFound) {
+		return false, err
+	}
+
+	// 检查别名唯一性（如果提供了别名）
+	if in.Alias != "" {
+		_, err := l.svcCtx.CategoryModel.FindBySystemParentAlias(
+			l.ctx,
+			in.SystemId,
+			in.ParentId,
+			in.Alias,
+		)
+		if err == nil {
+			return true, nil
+		} else if !errors.Is(err, model.ErrNotFound) {
+			return false, err
+		}
+	}
+
+	return false, nil
+}