fix: sort.

controllers/step_train.go

@@ -751,12 +751,12 @@ func (tc *StepTrainingController) GetTrainingRank(c *gin.Context) {
 	query := tc.DB.Model(&models.RegressionResult{})
 	switch regType {
 	case models.LinearRegression:
-		query = query.Where("slope IS NOT NULL").Select("train_id, slope AS metric")
+		query = query.Where("slope IS NOT NULL").Select("train_id, slope,regression_type")
 	case models.QuadraticRegression:
 		query = query.Where("quadratic_a IS NOT NULL").
-			Select("train_id, ABS(quadratic_a) AS metric")
+			Select("train_id, ABS(quadratic_a),regression_type")
 	}
-	if err := query.Find(&records).Error; err != nil {
+	if err := query.Debug().Find(&records).Error; err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "查询排名数据失败"})
 		return
 	}
@@ -767,12 +767,22 @@ func (tc *StepTrainingController) GetTrainingRank(c *gin.Context) {
 		return
 	}
 
-	// 排序逻辑
 	sort.Slice(records, func(i, j int) bool {
-		if regType == models.LinearRegression {
-			return *records[i].Slope < *records[j].Slope
+		// 处理空指针情况
+		slopeI := records[i].Slope
+		slopeJ := records[j].Slope
+
+		if slopeI == nil && slopeJ == nil {
+			return false // 两者均为空时视为相等
 		}
-		return math.Abs(*records[i].QuadraticA) > math.Abs(*records[j].QuadraticA) // 二次回归按绝对值降序
+		if slopeI == nil {
+			return false // 空值视为极大值（排在最后）
+		}
+		if slopeJ == nil {
+			return true // 非空值始终排在前
+		}
+
+		return *slopeI > *slopeJ
 	})
 
 	// 计算排名（处理并列）