add loading links form file

kontor-gin/internal/models/sport.go

@@ -1,7 +1,9 @@
 package models
 
 import (
+	"fmt"
 	"kontor-api-gin/internal/helpers"
+	"log/slog"
 	"time"
 )
 
@@ -27,6 +29,36 @@ type SportDTO struct {
 	Name      string             `json:"name"                   binding:"required"`
 }
 
+type SportDTOList []SportDTO
+
+func (sportList *SportDTOList) CompareIds(target *SportDTOList) (missing, obsolete []string) {
+	sources := make(map[string]SportDTO, len(*sportList))
+	targets := make(map[string]SportDTO, len(*target))
+	for _, source := range *sportList {
+		sources[source.ID] = source
+	}
+	for _, target := range *target {
+		targets[target.ID] = target
+	}
+	// iterate source IDs
+	for id := range sources {
+		if _, ok := targets[id]; ok {
+			slog.Info(fmt.Sprintf("ID %s found in both lists", id))
+		} else {
+			missing = append(missing, id)
+		}
+	}
+	for id := range targets {
+		if _, ok := sources[id]; ok {
+			slog.Info(fmt.Sprintf("ID %s found in both lists", id))
+		} else {
+			obsolete = append(obsolete, id)
+		}
+	}
+	slog.Info("CompareIds", "missing", missing, "obsolete", obsolete)
+	return missing, obsolete
+}
+
 func ConvertSportsToDtos(sports []Sport) []SportDTO {
 	dtos := make([]SportDTO, len(sports))
 	for i, sport := range sports {