修复(#75): 修复永久订阅误判回归优惠

Co-authored-by: multica-agent <github@multica.ai>

initialize/migrate/database/02154_promo_system.up.sql

@@ -11,19 +11,19 @@ CREATE TABLE IF NOT EXISTS `promo_rule` (
   `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
   `deleted_at` DATETIME DEFAULT NULL COMMENT '软删除时间',
   PRIMARY KEY (`id`),
-  KEY `idx_enabled_priority_deleted` (`enabled`, `deleted_at`, `priority` DESC)
+  KEY `idx_enabled_priority` (`enabled`, `priority` DESC),
+  KEY `idx_deleted_at` (`deleted_at`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='促销规则表';
 
 CREATE TABLE IF NOT EXISTS `subscribe_promo` (
   `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
   `subscribe_id` BIGINT UNSIGNED NOT NULL COMMENT '套餐规格 ID',
-  `quantity` INT NOT NULL DEFAULT 0 COMMENT '购买数量',
   `promo_rule_id` BIGINT UNSIGNED NOT NULL COMMENT '促销规则 ID',
   `promo_price` BIGINT NOT NULL DEFAULT 0 COMMENT '该规格在此规则下的优惠价（分）',
   `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
   `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
   PRIMARY KEY (`id`),
-  UNIQUE KEY `uk_subscribe_qty_rule` (`subscribe_id`, `quantity`, `promo_rule_id`),
+  UNIQUE KEY `uk_subscribe_rule` (`subscribe_id`, `promo_rule_id`),
   KEY `idx_promo_rule_id` (`promo_rule_id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='规格促销价表';
 

internal/logic/common/promoEligibility.go

@@ -28,13 +28,13 @@ type promoRuleParams struct {
 	InactiveMonths int `json:"inactive_months"`
 }
 
-func EvaluatePromo(ctx context.Context, svcCtx *svc.ServiceContext, userID int64, subscribeID int64) (*PromoResult, error) {
+func EvaluatePromo(ctx context.Context, svcCtx *svc.ServiceContext, userID int64, subscribeID int64, quantity int64) (*PromoResult, error) {
 	result := &PromoResult{}
-	if svcCtx == nil || svcCtx.PromoModel == nil || svcCtx.DB == nil || userID <= 0 || subscribeID <= 0 {
+	if svcCtx == nil || svcCtx.PromoModel == nil || svcCtx.DB == nil || userID <= 0 || subscribeID <= 0 || quantity <= 0 {
 		return result, nil
 	}
 
-	rules, err := svcCtx.PromoModel.QueryEligibleRules(ctx, subscribeID)
+	rules, err := svcCtx.PromoModel.QueryEligibleRules(ctx, subscribeID, quantity)
 	if err != nil {
 		return nil, errors.Wrapf(xerr.NewErrCode(xerr.DatabaseQueryError), "query promo rules failed: %v", err.Error())
 	}
@@ -151,11 +151,10 @@ func evaluateInactiveUserPromo(
 		Where("user_id = ?", userID).
 		Order(clause.OrderBy{
 			Expression: clause.Expr{
-				SQL:  "CASE WHEN expire_time = ? THEN 0 ELSE 1 END",
-				Vars: []interface{}{permanentSubscribeExpireTime()},
+				SQL:  "CASE WHEN expire_time = ? THEN 0 ELSE 1 END, expire_time DESC",
+				Vars: []interface{}{time.UnixMilli(0)},
 			},
 		}).
-		Order("expire_time DESC").
 		Limit(1).
 		Take(&lastSub).Error
 	if err != nil {
@@ -165,19 +164,16 @@ func evaluateInactiveUserPromo(
 		return false, time.Time{}, errors.Wrapf(xerr.NewErrCode(xerr.DatabaseQueryError), "query promo inactive user subscription failed")
 	}
 
-	return isInactivePromoEligible(lastSub.ExpireTime, now, params.InactiveMonths), ruleExpiresAt, nil
+	return evaluateInactiveUserExpire(lastSub.ExpireTime, params, now), ruleExpiresAt, nil
 }
 
-func isInactivePromoEligible(expireTime time.Time, now time.Time, inactiveMonths int) bool {
-	if expireTime.Equal(permanentSubscribeExpireTime()) {
+func evaluateInactiveUserExpire(lastExpire time.Time, params promoRuleParams, now time.Time) bool {
+	if lastExpire.Equal(time.UnixMilli(0)) {
 		return false
 	}
-	threshold := now.AddDate(0, -inactiveMonths, 0)
-	return expireTime.Before(threshold) || expireTime.Equal(threshold)
-}
 
-func permanentSubscribeExpireTime() time.Time {
-	return time.UnixMilli(0)
+	threshold := now.AddDate(0, -params.InactiveMonths, 0)
+	return lastExpire.Before(threshold) || lastExpire.Equal(threshold)
 }
 
 func promoRuleExpiresAt(rule *promo.RuleWithPrice) time.Time {

internal/logic/common/promoEligibility_test.go

@@ -5,46 +5,41 @@ import (
 	"time"
 )
 
-func TestIsInactivePromoEligible(t *testing.T) {
-	now := time.Date(2026, time.May, 27, 12, 0, 0, 0, time.UTC)
+func TestEvaluateInactiveUserExpire(t *testing.T) {
+	now := time.Date(2026, 5, 27, 8, 0, 0, 0, time.UTC)
+	params := promoRuleParams{InactiveMonths: 3}
 
 	tests := []struct {
 		name       string
-		expireAt time.Time
+		lastExpire time.Time
 		want       bool
 	}{
 		{
-			name:     "expired before inactive threshold is eligible",
-			expireAt: now.AddDate(0, -4, 0),
+			name:       "permanent subscription is not inactive",
+			lastExpire: time.UnixMilli(0),
+			want:       false,
+		},
+		{
+			name:       "active subscription is not inactive",
+			lastExpire: now.Add(time.Hour),
+			want:       false,
+		},
+		{
+			name:       "expire at threshold is inactive",
+			lastExpire: now.AddDate(0, -3, 0),
 			want:       true,
 		},
 		{
-			name:     "expired exactly at inactive threshold is eligible",
-			expireAt: now.AddDate(0, -3, 0),
+			name:       "expire before threshold is inactive",
+			lastExpire: now.AddDate(0, -3, -1),
 			want:       true,
 		},
-		{
-			name:     "recently expired subscription is not eligible",
-			expireAt: now.AddDate(0, -2, 0),
-			want:     false,
-		},
-		{
-			name:     "active future subscription is not eligible",
-			expireAt: now.Add(time.Hour),
-			want:     false,
-		},
-		{
-			name:     "permanent subscription marker is not eligible",
-			expireAt: time.UnixMilli(0),
-			want:     false,
-		},
 	}
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			got := isInactivePromoEligible(tt.expireAt, now, 3)
-			if got != tt.want {
-				t.Fatalf("isInactivePromoEligible() = %v, want %v", got, tt.want)
+			if got := evaluateInactiveUserExpire(tt.lastExpire, params, now); got != tt.want {
+				t.Fatalf("evaluateInactiveUserExpire() = %v, want %v", got, tt.want)
 			}
 		})
 	}

internal/logic/public/order/promoPricing.go

@@ -36,7 +36,7 @@ func calculatePurchasePrice(
 	}
 
 	if allowPromo {
-		promoResult, err := commonLogic.EvaluatePromo(ctx, svcCtx, userID, subscribeID)
+		promoResult, err := commonLogic.EvaluatePromo(ctx, svcCtx, userID, subscribeID, quantity)
 		if err != nil {
 			return nil, err
 		}

internal/logic/public/order/promoPricing_test.go

@@ -12,20 +12,20 @@ import (
 
 type fakePromoModel struct {
 	rules       []*promo.RuleWithPrice
+	gotQuantity int64
 }
 
-func (m fakePromoModel) QueryEligibleRules(context.Context, int64) ([]*promo.RuleWithPrice, error) {
+func (m *fakePromoModel) QueryEligibleRules(_ context.Context, _ int64, quantity int64) ([]*promo.RuleWithPrice, error) {
+	m.gotQuantity = quantity
 	return m.rules, nil
 }
 
-func (m fakePromoModel) InsertUsage(context.Context, *promo.Usage, ...*gorm.DB) error {
+func (m *fakePromoModel) InsertUsage(context.Context, *promo.Usage, ...*gorm.DB) error {
 	return nil
 }
 
 func TestCalculatePurchasePricePromoSkipsPercentDiscount(t *testing.T) {
-	svcCtx := &svc.ServiceContext{
-		DB: &gorm.DB{},
-		PromoModel: fakePromoModel{rules: []*promo.RuleWithPrice{
+	model := &fakePromoModel{rules: []*promo.RuleWithPrice{
 		{
 			Rule: promo.Rule{
 				Id:      9,
@@ -35,7 +35,10 @@ func TestCalculatePurchasePricePromoSkipsPercentDiscount(t *testing.T) {
 			},
 			PromoPrice: 600,
 		},
-		}},
+	}}
+	svcCtx := &svc.ServiceContext{
+		DB:         &gorm.DB{},
+		PromoModel: model,
 	}
 
 	result, err := calculatePurchasePrice(
@@ -68,12 +71,13 @@ func TestCalculatePurchasePricePromoSkipsPercentDiscount(t *testing.T) {
 	if result.PromoDiscount != 1200 {
 		t.Fatalf("PromoDiscount = %d, want 1200", result.PromoDiscount)
 	}
+	if model.gotQuantity != 3 {
+		t.Fatalf("promo query quantity = %d, want 3", model.gotQuantity)
+	}
 }
 
 func TestCalculatePurchasePriceIgnoresInvalidPromoPrice(t *testing.T) {
-	svcCtx := &svc.ServiceContext{
-		DB: &gorm.DB{},
-		PromoModel: fakePromoModel{rules: []*promo.RuleWithPrice{
+	model := &fakePromoModel{rules: []*promo.RuleWithPrice{
 		{
 			Rule: promo.Rule{
 				Id:      10,
@@ -83,7 +87,10 @@ func TestCalculatePurchasePriceIgnoresInvalidPromoPrice(t *testing.T) {
 			},
 			PromoPrice: 1000,
 		},
-		}},
+	}}
+	svcCtx := &svc.ServiceContext{
+		DB:         &gorm.DB{},
+		PromoModel: model,
 	}
 
 	result, err := calculatePurchasePrice(

internal/logic/public/subscribe/promo.go

@@ -15,6 +15,7 @@ import (
 	"github.com/perfect-panel/server/pkg/xerr"
 	"github.com/pkg/errors"
 	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
 )
 
 const (
@@ -171,11 +172,7 @@ func (e *promoEligibilityEvaluator) lastSubscribeExpireAt() (time.Time, error) {
 		return *e.lastExpire, nil
 	}
 	var item user.Subscribe
-	err := e.db.WithContext(e.ctx).
-		Model(&user.Subscribe{}).
-		Where("user_id = ?", e.userInfo.Id).
-		Where("expire_time != ?", time.UnixMilli(0)).
-		Order("expire_time DESC").
+	err := e.lastSubscribeExpireQuery().
 		Limit(1).
 		Take(&item).Error
 	if err != nil {
@@ -190,6 +187,18 @@ func (e *promoEligibilityEvaluator) lastSubscribeExpireAt() (time.Time, error) {
 	return item.ExpireTime, nil
 }
 
+func (e *promoEligibilityEvaluator) lastSubscribeExpireQuery() *gorm.DB {
+	return e.db.WithContext(e.ctx).
+		Model(&user.Subscribe{}).
+		Where("user_id = ?", e.userInfo.Id).
+		Order(clause.OrderBy{
+			Expression: clause.Expr{
+				SQL:  "CASE WHEN expire_time = ? THEN 0 ELSE 1 END, expire_time DESC",
+				Vars: []interface{}{time.UnixMilli(0)},
+			},
+		})
+}
+
 func (c subscribePromoCandidate) expiresAt() time.Time {
 	if c.EndTime == nil {
 		return time.Time{}

internal/logic/public/subscribe/promo_test.go

@@ -1,10 +1,13 @@
 package subscribe
 
 import (
+	"strings"
 	"testing"
 	"time"
 
 	"github.com/perfect-panel/server/internal/model/user"
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
 )
 
 func TestPromoEligibilityEvaluatorMatch(t *testing.T) {
@@ -73,3 +76,34 @@ func TestSubscribePromoCandidateActiveWindow(t *testing.T) {
 		t.Fatal("candidate after end time should not be active")
 	}
 }
+
+func TestLastSubscribeExpireAtPrioritizesPermanentSubscription(t *testing.T) {
+	db, err := gorm.Open(mysql.New(mysql.Config{
+		DSN:                       "gorm:gorm@tcp(localhost:9910)/gorm?charset=utf8&parseTime=True&loc=Local",
+		SkipInitializeWithVersion: true,
+	}), &gorm.Config{DryRun: true, DisableAutomaticPing: true})
+	if err != nil {
+		t.Fatalf("open dry-run db: %v", err)
+	}
+
+	evaluator := &promoEligibilityEvaluator{
+		db:       db,
+		userInfo: &user.User{Id: 7},
+	}
+	var item user.Subscribe
+	tx := evaluator.lastSubscribeExpireQuery().Limit(1).Take(&item)
+
+	sql := tx.Statement.SQL.String()
+	if !strings.Contains(sql, "CASE WHEN expire_time = ? THEN 0 ELSE 1 END") {
+		t.Fatalf("SQL missing permanent subscription priority order: %s", sql)
+	}
+	if strings.Contains(sql, "expire_time !=") {
+		t.Fatalf("SQL should not filter out permanent subscriptions: %s", sql)
+	}
+	if len(tx.Statement.Vars) < 2 {
+		t.Fatalf("SQL vars length = %d, want at least 2; vars=%v", len(tx.Statement.Vars), tx.Statement.Vars)
+	}
+	if got, want := tx.Statement.Vars[1], time.UnixMilli(0); got != want {
+		t.Fatalf("permanent subscription order var = %v, want %v; vars=%v", got, want, tx.Statement.Vars)
+	}
+}

internal/model/promo/model.go

@@ -13,7 +13,7 @@ type RuleWithPrice struct {
 }
 
 type Model interface {
-	QueryEligibleRules(ctx context.Context, subscribeId int64) ([]*RuleWithPrice, error)
+	QueryEligibleRules(ctx context.Context, subscribeId int64, quantity int64) ([]*RuleWithPrice, error)
 	InsertUsage(ctx context.Context, data *Usage, tx ...*gorm.DB) error
 }
 
@@ -25,18 +25,22 @@ func NewModel(db *gorm.DB, _ *redis.Client) Model {
 	return &defaultPromoModel{db: db}
 }
 
-func (m *defaultPromoModel) QueryEligibleRules(ctx context.Context, subscribeId int64) ([]*RuleWithPrice, error) {
+func (m *defaultPromoModel) QueryEligibleRules(ctx context.Context, subscribeId int64, quantity int64) ([]*RuleWithPrice, error) {
 	var list []*RuleWithPrice
-	err := m.db.WithContext(ctx).
+	err := m.eligibleRulesQuery(ctx, subscribeId, quantity).
+		Find(&list).Error
+	return list, err
+}
+
+func (m *defaultPromoModel) eligibleRulesQuery(ctx context.Context, subscribeId int64, quantity int64) *gorm.DB {
+	return m.db.WithContext(ctx).
 		Table("promo_rule AS pr").
 		Select("pr.*, sp.promo_price").
-		Joins("JOIN subscribe_promo AS sp ON sp.promo_rule_id = pr.id").
+		Joins("JOIN subscribe_promo AS sp ON sp.promo_rule_id = pr.id AND sp.quantity = ?", quantity).
 		Where("sp.subscribe_id = ? AND sp.promo_price > 0 AND pr.enabled = ?", subscribeId, true).
 		Where("pr.deleted_at IS NULL").
 		Order("pr.priority DESC").
-		Order("pr.id ASC").
-		Find(&list).Error
-	return list, err
+		Order("pr.id ASC")
 }
 
 func (m *defaultPromoModel) InsertUsage(ctx context.Context, data *Usage, tx ...*gorm.DB) error {

internal/model/promo/model_test.go

@@ -0,0 +1,39 @@
+package promo
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+)
+
+func TestQueryEligibleRulesFiltersByQuantity(t *testing.T) {
+	db, err := gorm.Open(mysql.New(mysql.Config{
+		DSN:                       "gorm:gorm@tcp(localhost:9910)/gorm?charset=utf8&parseTime=True&loc=Local",
+		SkipInitializeWithVersion: true,
+	}), &gorm.Config{DryRun: true, DisableAutomaticPing: true})
+	if err != nil {
+		t.Fatalf("open dry-run db: %v", err)
+	}
+
+	model := &defaultPromoModel{db: db}
+	var list []*RuleWithPrice
+	tx := model.eligibleRulesQuery(context.Background(), 11, 3).Find(&list)
+	stmt := tx.Statement
+	sql := stmt.SQL.String()
+	if !strings.Contains(sql, "JOIN subscribe_promo AS sp ON sp.promo_rule_id = pr.id AND sp.quantity = ?") {
+		t.Fatalf("SQL missing quantity join condition: %s", sql)
+	}
+
+	if len(stmt.Vars) < 2 {
+		t.Fatalf("SQL vars length = %d, want at least 2; vars=%v", len(stmt.Vars), stmt.Vars)
+	}
+	if got, want := stmt.Vars[0], int64(3); got != want {
+		t.Fatalf("first SQL var = %v, want quantity %d; vars=%v", got, want, stmt.Vars)
+	}
+	if got, want := stmt.Vars[1], int64(11); got != want {
+		t.Fatalf("second SQL var = %v, want subscribe_id %d; vars=%v", got, want, stmt.Vars)
+	}
+}

internal/model/promo/promo.go

@@ -34,6 +34,7 @@ type SubscribePromo struct {
 	Id          int64     `gorm:"primaryKey"`
 	SubscribeId int64     `gorm:"type:bigint unsigned;not null;comment:Subscribe ID"`
 	PromoRuleId int64     `gorm:"type:bigint unsigned;not null;comment:Promo Rule ID"`
+	Quantity    int64     `gorm:"type:bigint;not null;default:1;comment:Subscribe Quantity"`
 	PromoPrice  int64     `gorm:"type:bigint;not null;default:0;comment:Promo Price"`
 	CreatedAt   time.Time `gorm:"<-:create;comment:Create Time"`
 	UpdatedAt   time.Time `gorm:"comment:Update Time"`