full/module/ec/order/internal/logic/cart/fetch.go

package cart

import (
	"context"

	"bsm/full/module/ec/order/internal/impl"
	"bsm/full/module/ec/order/internal/models"
	pb "bsm/full/module/ec/order/pb"

	"git.apinb.com/bsm-sdk/core/errcode"
	"git.apinb.com/bsm-sdk/core/printer"
	"git.apinb.com/bsm-sdk/core/service"
)

// 获取购物车的商品数据
func Fetch(ctx context.Context, in *pb.CartGetRequest) (reply *pb.CartGetReply, err error) {
	auth, err := service.ParseMetaCtx(ctx, nil)
	if err != nil {
		return nil, err
	}
	var (
		result = make([]*pb.CartItem, 0)
		cart   = make([]*models.OrderCart, 0)
	)
	if in.GetPassport() == "" {
		if in.GetCarIdentity() == "" && in.GetPassportIdentity() == "" {
			return nil, errcode.ErrInvalidArgument
		}
	}
	// 查询购物车数据：仅返回属于当前登录者的条目，cart_identity 只作附加过滤。
	tx := impl.DBService.Where("passport_identity = ?", auth.Identity)
	if in.GetCarIdentity() != "" {
		tx = tx.Where("cart_identity = ?", in.GetCarIdentity())
	}
	err = tx.Find(&cart).Error

	if err != nil {
		printer.Error(err.Error())
		return nil, errcode.ErrDB
	}

	for _, item := range cart {
		product := models.Product{}
		err := impl.DBService.Raw(`
    SELECT 
        p.id, p.identity, p.title, p.cover_image, p.args,
        ( SELECT MIN(mps.price) 
            FROM product_spec ps 
            JOIN mall_product_spec mps ON ps.spec_id = mps.id
            WHERE ps.product_identity = p.identity 
        ) as sales_price FROM mall_product p WHERE p.identity = ?`, item.ProductIdentity).Scan(&product).Error
		if err != nil {
			printer.Error(err.Error())
			return nil, errcode.ErrDB
		}
		da := &pb.CartItem{
			Id:              int64(item.ID),
			ProductId:       product.Id,
			Title:           product.Title,
			ProductIdentity: product.Identity,
			CoverImage:      product.CoverImage,
			SalesPrice:      product.SalesPrice,
			ProductArgs:     item.ProductArgs,
			UnitPrice:       product.SalesPrice,
			TotalPrice:      int64(item.Number) * product.SalesPrice,
			Number:          item.Number,
			Identity:        item.Identity,
		}
		result = append(result, da)
	}

	return &pb.CartGetReply{
		Data:        result,
		CarIdentity: in.GetCarIdentity(),
	}, nil
}