getColumnById

application/Espo/Core/Formula/Functions/EntityGroup/GetLinkColumnType.php

@@ -65,6 +65,8 @@ class GetLinkColumnType extends \Espo\Core\Formula\Functions\Base implements
         $entityType = $this->getEntity()->getEntityType();
         $repository = $this->entityManager->getRDBRepository($entityType);
 
-        return $repository->getRelationColumn($this->getEntity(), $link, $id, $column);
+        return $repository
+            ->getRelation($this->getEntity(), $link)
+            ->getColumnById($id, $column);
     }
 }

application/Espo/ORM/Repository/RDBRelation.php

@@ -487,7 +487,7 @@ class RDBRelation
     /**
      * Update relationship columns by ID. For many-to-many relationships.
      *
-     * @param array<string,mixed> $columnData Role values.
+     * @param array<string, mixed> $columnData Role values.
      */
     public function updateColumnsById(string $id, array $columnData): void
     {
@@ -606,6 +606,18 @@ class RDBRelation
         return $this->getMapper()->getRelationColumn($this->entity, $this->relationName, $id, $column);
     }
 
+    /**
+     * Get a relationship column value by a foreign record ID. For many-to-many relationships.
+     */
+    public function getColumnById(string $id, string $column): string|int|float|bool|null
+    {
+        if ($this->relationType !== Entity::MANY_MANY) {
+            throw new RuntimeException("Can't get a column of not many-to-many relation.");
+        }
+
+        return $this->getMapper()->getRelationColumn($this->entity, $this->relationName, $id, $column);
+    }
+
     /**
      * @param array<string, mixed>|null $columnData Role values.
      * @param array<string, mixed> $options