1. BannerList

func (s *GoodsServer) BannerList(ctx context.Context, req *emptypb.Empty) (*proto.BannerListResponse, error) {
    bannerListResponse := proto.BannerListResponse{}
    var banners []model.Banner
    result := global.DB.Find(&banners)
    bannerListResponse.Total = int32(result.RowsAffected)
    var bannerReponses []*proto.BannerResponse
    for _, banner := range banners {
        bannerReponses = append(bannerReponses, &proto.BannerResponse{
            Id:       banner.ID,
            Image:       banner.Image,
            Index: banner.Index,
            Url: banner.Url,
        })
    }
    bannerListResponse.Data = bannerReponses
    return &bannerListResponse, nil
}

2. CreateBanner

func (s *GoodsServer) CreateBanner(ctx context.Context, req *proto.BannerRequest) (*proto.BannerResponse, error) {
    banner := model.Banner{}
    banner.Image = req.Image
    banner.Index = req.Index
    banner.Url = req.Url
    global.DB.Save(&banner)
    return &proto.BannerResponse{Id:banner.ID}, nil
}

3. DeleteBanner

func (s *GoodsServer) DeleteBanner(ctx context.Context, req *proto.BannerRequest) (*emptypb.Empty, error) {
    if result := global.DB.Delete(&model.Banner{}, req.Id); result.RowsAffected == 0 {
        return nil, status.Errorf(codes.NotFound, "轮播图不存在")
    }
    return &emptypb.Empty{}, nil
}

4. UpdateBanner

func (s *GoodsServer) UpdateBanner(ctx context.Context, req *proto.BannerRequest) (*emptypb.Empty, error) {
    var banner model.Banner
    if result := global.DB.First(&banner, req.Id); result.RowsAffected == 0 {
        return nil, status.Errorf(codes.NotFound, "轮播图不存在")
    }
    if req.Url != "" {
        banner.Url = req.Url
    }
    if req.Image != "" {
        banner.Image = req.Image
    }
    if req.Index != 0 {
        banner.Index = req.Index
    }
    global.DB.Save(&banner)
    return &emptypb.Empty{}, nil
}