Show parts count on AdminPages of PartsContainingDBElements

src/Entity/Parts/MeasurementUnit.php

@@ -82,6 +82,11 @@ class MeasurementUnit extends PartsContainingDBElement
      */
     protected $parent;
 
+    /**
+     * @ORM\OneToMany(targetEntity="Part", mappedBy="partUnit", fetch="EXTRA_LAZY")
+     */
+    protected $parts;
+
     /**
      * Returns the ID as an string, defined by the element class.
      * This should have a form like P000014, for a part with ID 14.