fix: create

internal/services/append_associations.go

@@ -0,0 +1,45 @@
+package services
+
+import (
+	"errors"
+	"reflect"
+
+	"gorm.io/gorm"
+)
+
+// AppendAssociations uses reflection to find all exported slice fields
+// in 'item' and then appends any elements in each slice to the association.
+func AppendAssociations(db *gorm.DB, item interface{}) error {
+	// We expect a pointer to a struct so we can do db.Model(item).
+	val := reflect.ValueOf(item)
+	if val.Kind() != reflect.Ptr {
+		return errors.New("item must be a pointer to a struct")
+	}
+
+	elem := val.Elem()
+	if elem.Kind() != reflect.Struct {
+		return errors.New("item must be a pointer to a struct")
+	}
+
+	t := elem.Type()
+	for i := 0; i < elem.NumField(); i++ {
+		fieldVal := elem.Field(i)
+		fieldType := t.Field(i)
+
+		// Process only exported fields (PkgPath == "") and slices.
+		if fieldType.PkgPath == "" && fieldVal.Kind() == reflect.Slice {
+			// The association name is the struct field name by default.
+			assocName := fieldType.Name
+
+			// Append slice elements to the existing association.
+			// You can add checks here if you want to skip empty slices, etc.
+			if fieldVal.Len() > 0 {
+				if err := db.Model(item).Association(assocName).Append(fieldVal.Interface()); err != nil {
+					return err
+				}
+			}
+		}
+	}
+
+	return nil
+}