Refactors relation handling with helper methods

Introduces factory methods to streamline creation of relation objects
from raw values and document arrays, improving readability and
maintainability. Reduces code duplication and clarifies relation mapping logic.

Author: Vitexus

src/AbraFlexi/RO.php

@@ -1127,20 +1127,21 @@ public function fixRecordTypes(array $record, $evidence = null)
                                             $record[$column][$a] = $b;
                                         }
                                     } else {
-                                        $record[$column] = new Relation(
-                                            $value,
-                                            $column,
-                                            str_replace('ext:', '', $value),
-                                            $value,
-                                        );
+                                        $relation = Relation::fromExtId($value, $column);
+                                        $record[$column][$relation->target] = $relation;
                                     }
                                 } else { // ExtIDs
                                     if (\count($record[$column]) === 1) {
-                                        $record[$column] = new Relation(\array_key_exists('kod', $value) ? $value['kod'] : $value['id'], $value['typDoklK'], $value['id'], $value['typDoklK@showAs']);
+                                        if (\is_array($value)) {
+                                            $record[$column] = Relation::fromTypDokl($value);
+                                        } else {
+                                            $relation = Relation::fromExtId($value, $column);
+                                            $record[$column][$relation->target] = $relation;
+                                        }
                                     } else {
                                         foreach ($record[$column] as $relPos => $rawRelation) {
-                                            [,$ext,$extId] = explode(':', $rawRelation);
-                                            $record[$column][$ext] = new Relation($rawRelation, $ext, $extId, $column.' '.$ext.':'.$extId);
+                                            $relation = Relation::fromExtId($rawRelation, $column);
+                                            $record[$column][$relation->target] = $relation;
                                             unset($record[$column][$relPos]);
                                         }
                                     }

src/AbraFlexi/Relation.php

@@ -102,4 +102,19 @@ public function offsetUnset(mixed $offset): void
     {
         unset($this->data[$offset]);
     }
+
+    /**
+     * Create Relation object from ExtID.
+     */
+    public static function fromExtId(string $extIdRaw, string $column): self
+    {
+        [,$ext,$extId] = explode(':', $extIdRaw);
+
+        return new self($extId, $ext, $extId, trim($column.' '.$ext).':'.$extId);
+    }
+
+    public static function fromTypDokl(array $typDokl): self
+    {
+        return new self(\array_key_exists('kod', $typDokl) ? $typDokl['kod'] : $typDokl['id'], $typDokl['typDoklK'], $typDokl['id'], $typDokl['typDoklK@showAs']);
+    }
 }