1. BrandList

func (s *GoodsServer) BrandList(ctx context.Context, req *proto.BrandFilterRequest) (*proto.BrandListResponse, error){
    brandListResponse := proto.BrandListResponse{}
    var brands []model.Brands
    result := global.DB.Scopes(Paginate(int(req.Pages), int(req.PagePerNums))).Find(&brands)
    if result.Error != nil {
        return nil, result.Error
    }
    var total int64
    global.DB.Model(&model.Brands{}).Count(&total)
    brandListResponse.Total = int32(total)
    var brandResponses []*proto.BrandInfoResponse
    for _, brand := range brands {
        brandResponses = append(brandResponses, &proto.BrandInfoResponse{
            Id:  brand.ID,
            Name: brand.Name,
            Logo: brand.Logo,
        })
    }
    brandListResponse.Data = brandResponses
    return &brandListResponse, nil
}

2. CreateBrand

func (s *GoodsServer) CreateBrand(ctx context.Context, req *proto.BrandRequest) (*proto.BrandInfoResponse, error){
    //新建品牌
    if result := global.DB.First(&model.Brands{}); result.RowsAffected == 1 {
        return nil, status.Errorf(codes.InvalidArgument, "品牌已存在")
    }
    brand := &model.Brands{
        Name:  req.Name,
        Logo: req.Logo,
    }
    global.DB.Save(brand)
    return &proto.BrandInfoResponse{Id: brand.ID}, nil
}

3. DeleteBrand

func (s *GoodsServer)  DeleteBrand(ctx context.Context, req *proto.BrandRequest) (*emptypb.Empty, error) {
    if result := global.DB.Delete(&model.Brands{}, req.Id); result.RowsAffected    == 0{
        return nil, status.Errorf(codes.NotFound, "品牌不存在")
    }
    return &emptypb.Empty{}, nil
}

4. UpdateBrand

func (s *GoodsServer) UpdateBrand(ctx context.Context, req *proto.BrandRequest) (*emptypb.Empty, error){
    brands := model.Brands{}
    if result := global.DB.First(&brands); result.RowsAffected == 0 {
        return nil, status.Errorf(codes.InvalidArgument, "品牌不存在")
    }
    if req.Name != "" {
        brands.Name = req.Name
    }
    if req.Logo != "" {
        brands.Logo = req.Logo
    }
    global.DB.Save(&brands)
    return &emptypb.Empty{}, nil
}