- Added a closure on key to EntityCollection buildArray method.

- Some bugfixes done.

src/EntityCollection.php

@@ -181,25 +181,27 @@ class EntityCollection extends \ArrayObject {
         return $return ?? null;
     }
 
-    public function buildArray(string $keyColumn, /* string|callable|null */ $value = null) : array
+    public function buildArray(/* string|callable|null */ $keyColumn, /* string|callable|null */ $value = null) : array
     {
         $list = [];
 
         foreach($this as $item) {
+            $key = $keyColumn instanceof \Closure ? $keyColumn($item) : $item->$keyColumn;
+
             switch (true) {
                 case is_null($value):
-                    $list[] = $item->$keyColumn;
+                    $list[] = $key;
                     break;
 
                 case is_callable($value):
-                    $list[$item->$keyColumn] = $value($item);
+                    $list[$key] = $value($item);
                     break;
 
                 case is_object($value):
                 case is_string($value):
                     $value = (string) $value;
 
-                    $list[$item->$keyColumn] = $item->$value;
+                    $list[$key] = $item->$value;
                     break;
             }
         }