91 lines
3.9 KiB
Go
91 lines
3.9 KiB
Go
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// 功能描述：按购物车或收藏关联分类推荐真实在售商品；版本：1.0.0。
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package user
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import (
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"git.apinb.com/bsm-sdk/core/errcode"
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"git.apinb.com/bsm-sdk/core/infra"
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"git.apinb.com/heqiapp/platforms/backend/api/internal/impl"
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common "git.apinb.com/heqiapp/platforms/backend/api/internal/logic/common"
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"git.apinb.com/heqiapp/platforms/backend/api/internal/models"
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"github.com/gin-gonic/gin"
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"gorm.io/gorm"
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"gorm.io/gorm/clause"
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)
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// Recommendations 排除本人已入购物车商品，收藏场景另排除已收藏；相同分类优先，其余按最近更新排序。
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func Recommendations(ctx *gin.Context) {
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account, ok := common.UserAccount(ctx)
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if !ok {
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return
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}
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var request struct {
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Source string `form:"source,default=cart" binding:"oneof=cart favorites"`
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Page int `form:"page,default=1" binding:"gte=1,lte=10000"`
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Size int `form:"page_size,default=2" binding:"gte=1,lte=20"`
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}
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if ctx.ShouldBindQuery(&request) != nil {
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infra.Response.Error(ctx, errcode.ErrInvalidArgument)
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return
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}
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query := impl.DBService.Where("status = ? AND stock_quantity > 0", common.StatusEnable).
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Where("NOT EXISTS (SELECT 1 FROM ec_cart c WHERE c.ec_product_id = ec_product.id AND c.user_account_id = ? AND c.status = ? AND c.deleted_at IS NULL)", account.ID, common.StatusEnable)
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table := "ec_cart"
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if request.Source == "favorites" {
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table = "ec_favorite"
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query = query.Where("NOT EXISTS (SELECT 1 FROM ec_favorite f WHERE f.ec_product_id = ec_product.id AND f.user_account_id = ? AND f.status = ? AND f.deleted_at IS NULL)", account.ID, common.StatusEnable)
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}
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// 表名来自固定枚举，用户输入不拼接进SQL；归属只使用JWT对应的内部账户键。
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rank := "CASE WHEN EXISTS (SELECT 1 FROM " + table + " r JOIN ec_product p ON p.id = r.ec_product_id WHERE r.user_account_id = ? AND r.status = ? AND r.deleted_at IS NULL AND p.ec_category_id = ec_product.ec_category_id) THEN 0 ELSE 1 END"
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var products []models.EcProduct
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if err := query.Clauses(clause.OrderBy{Expression: gorm.Expr(rank+", ec_product.updated_at desc, ec_product.identity", account.ID, common.StatusEnable)}).Offset((request.Page - 1) * request.Size).Limit(request.Size + 1).Find(&products).Error; err != nil {
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infra.Response.Error(ctx, err)
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return
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}
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values, err := recommendationValues(impl.DBService, products)
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if err != nil {
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infra.Response.Error(ctx, err)
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return
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}
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respondClientPage(ctx, clientPage{Number: request.Page, Size: request.Size}, values)
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}
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// recommendationValues 批量读取主图和分类，公开结果只包含展示和下单所需字段。
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func recommendationValues(db *gorm.DB, products []models.EcProduct) ([]gin.H, error) {
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result := make([]gin.H, 0, len(products))
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if len(products) == 0 {
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return result, nil
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}
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ids := make([]uint64, 0, len(products))
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categoryIDs := []uint64{}
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seen := map[uint64]bool{}
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for _, p := range products {
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ids = append(ids, p.ID)
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if !seen[p.EcCategoryID] {
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seen[p.EcCategoryID] = true
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categoryIDs = append(categoryIDs, p.EcCategoryID)
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}
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}
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var images []models.EcProductImage
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if err := db.Where("ec_product_id IN ? AND status = ?", ids, common.StatusEnable).Order("is_cover desc, sort_no, identity").Find(&images).Error; err != nil {
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return nil, err
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}
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imageMap := map[uint64]string{}
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for _, i := range images {
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if _, ok := imageMap[i.EcProductID]; !ok {
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imageMap[i.EcProductID] = i.ImageURI
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}
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}
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var categories []models.EcCategory
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if err := db.Where("id IN ? AND status = ?", categoryIDs, common.StatusEnable).Find(&categories).Error; err != nil {
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return nil, err
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}
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categoryMap := map[uint64]string{}
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for _, c := range categories {
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categoryMap[c.ID] = c.Name
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}
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for _, p := range products {
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result = append(result, gin.H{"identity": p.Identity, "name": p.Name, "price_amount": p.PriceAmount, "stock_quantity": p.StockQuantity, "image_url": imageMap[p.ID], "category_name": categoryMap[p.EcCategoryID]})
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}
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return result, nil
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}
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