Show the number of parts with this element and all its child elements in Admin pages

src/Entity/Base/AbstractStructuralDBElement.php

@@ -93,7 +93,7 @@ abstract class AbstractStructuralDBElement extends AttachmentContainingDBElement
      * @NoneOfItsChildren()
      * @Groups({"include_parents"})
      */
-    protected $parent;
+    protected $parent = null;
 
     /** @var string[] all names of all parent elements as a array of strings,
      *  the last array element is the name of the element itself
@@ -271,16 +271,17 @@ abstract class AbstractStructuralDBElement extends AttachmentContainingDBElement
      */
     public function getSubelements(): iterable
     {
-        return $this->children;
+        return $this->children ?? new ArrayCollection();
     }
 
     /**
+     * @see getSubelements()
      * @return Collection<static>|iterable
      * @psalm-return Collection<int, static>
      */
     public function getChildren(): iterable
     {
-        return $this->children;
+        return $this->getSubelements();
     }
 
     public function isNotSelectable(): bool

src/Repository/AbstractPartsContainingRepository.php

@@ -45,6 +45,23 @@ abstract class AbstractPartsContainingRepository extends StructuralDBElementRepo
      */
     abstract public function getPartsCount(object $element): int;
 
+    /**
+     * Returns the count of the parts associated with this element and all its children.
+     * Please be aware that this function is pretty slow on large trees!
+     * @param  AbstractPartsContainingDBElement  $element
+     * @return int
+     */
+    public function getPartsCountRecursive(AbstractPartsContainingDBElement $element): int
+    {
+        $count = $this->getPartsCount($element);
+
+        foreach ($element->getChildren() as $child) {
+            $count += $this->getPartsCountRecursive($child);
+        }
+
+        return $count;
+    }
+
     protected function getPartsByField(object $element, array $order_by, string $field_name): array
     {
         if (!$element instanceof AbstractPartsContainingDBElement) {

templates/AdminPages/_info.html.twig

@@ -1,15 +1,15 @@
 {% import "helper.twig" as helper %}
 
 <div class="form-group row">
-    <label class="col-form-label col-md-3">{% trans %}id.label{% endtrans %}</label>
+    <label class="col-form-label col-md-4">{% trans %}id.label{% endtrans %}</label>
-    <div class="col-md-9">
+    <div class="col-md-8">
         <p class="form-control-plaintext">{% if entity.iD %}{{ entity.id }}{% else %}-{% endif %}</p>
     </div>
 </div>
 
 <div class="form-group row">
-    <label class="col-form-label col-md-3">{% trans %}createdAt{% endtrans %}</label>
+    <label class="col-form-label col-md-4">{% trans %}createdAt{% endtrans %}</label>
-    <div class="col-md-9">
+    <div class="col-md-8">
         <p class="form-control-plaintext">
 
             {% if entity.id is not null and date(entity.addedDate) > date('1900/01/01') %}
@@ -22,8 +22,8 @@
 </div>
 
 <div class="form-group row">
-    <label class="col-form-label col-md-3">{% trans %}lastModified{% endtrans %}</label>
+    <label class="col-form-label col-md-4">{% trans %}lastModified{% endtrans %}</label>
-    <div class="col-md-9">
+    <div class="col-md-8">
         <p class="form-control-plaintext">
             {% if entity.id is not null and date(entity.lastModified) > date('1900/01/01') %}
                 {{ helper.date_user_combination(entity, true, "long") }}
@@ -35,9 +35,9 @@
 </div>
 
 <div class="form-group row">
-    <label class="col-form-label col-md-3">{% trans %}entity.info.parts_count{% endtrans %}</label>
+    <label class="col-form-label col-md-4">{% trans %}entity.info.parts_count{% endtrans %}</label>
-    <div class="col-md-9">
+    <div class="col-md-8">
-        <p class="form-control-static">
+        <p class="form-control-plaintext">
             {% if entity.id and partsContainingElement %}
                 {{ repo.partsCount(entity) }}
             {% else %}
@@ -45,4 +45,20 @@
             {% endif %}
         </p>
     </div>
-</div>
+</div>
+
+{# Check if we really have a structural element #}
+{% if entity.parent is defined %}
+    <div class="form-group row">
+        <label class="col-form-label col-md-4">{% trans %}entity.info.parts_count_recursive{% endtrans %}</label>
+        <div class="col-md-8">
+            <p class="form-control-plaintext">
+                {% if entity.id and partsContainingElement %}
+                    {{ repo.partsCountRecursive(entity) }}
+                {% else %}
+                    -
+                {% endif %}
+            </p>
+        </div>
+    </div>
+{% endif %}

translations/messages.en.xlf

@@ -1092,7 +1092,7 @@ Sub elements will be moved upwards.]]></target>
       </notes>
       <segment>
         <source>entity.info.parts_count</source>
-        <target>Count of parts with this element</target>
+        <target>Number of parts with this element</target>
       </segment>
     </unit>
     <unit id="4FQqOUW" name="specifications.property">
@@ -9771,5 +9771,11 @@ Element 3</target>
         <target>Target element ID</target>
       </segment>
     </unit>
+    <unit id="_vbPEFP" name="category.edit.partname_regex.placeholder">
+      <segment>
+        <source>category.edit.partname_regex.placeholder</source>
+        <target>Number of parts with this element or its subelements</target>
+      </segment>
+    </unit>
   </file>
 </xliff>