Added a basic dialog for editing/creating attachmentType elements.

assets/ts_src/ajax_ui.ts

@@ -68,8 +68,12 @@ class AjaxUI {
      * Starts the ajax ui und execute handlers registered in addStartAction().
      * Should be called in a document.ready, after handlers are set.
      */
-    public start()
+    public start(disabled : boolean = false)
     {
+        if(disabled) {
+            return;
+        }
+
         console.info("AjaxUI started!");
 
         this.BASE = $("body").data("base-url") + "/";
@@ -227,6 +231,19 @@ class AjaxUI {
     {
         let options : JQueryFormOptions = {
             success: this.onAjaxComplete,
+            beforeSerialize: function() : boolean {
+
+                //Update the content of textarea fields using CKEDITOR before submitting.
+
+                //@ts-ignore
+                for(let name in CKEDITOR.instances)
+                {
+                    //@ts-ignore
+                    CKEDITOR.instances[name].updateElement();
+                }
+
+                return true;
+            },
             beforeSubmit: function (arr, $form, options) : boolean {
                 //When data-with-progbar is specified, then show progressbar.
                 if($form.data("with-progbar") != undefined) {

src/Controller/AttachmentTypeController.php

@@ -0,0 +1,97 @@
+<?php
+/**
+ *
+ * part-db version 0.1
+ * Copyright (C) 2005 Christoph Lechner
+ * http://www.cl-projects.de/
+ *
+ * part-db version 0.2+
+ * Copyright (C) 2009 K. Jacobs and others (see authors.php)
+ * http://code.google.com/p/part-db/
+ *
+ * Part-DB Version 0.4+
+ * Copyright (C) 2016 - 2019 Jan Böhmer
+ * https://github.com/jbtronics
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ *
+ */
+
+namespace App\Controller;
+
+
+use App\Entity\AttachmentType;
+use App\Form\BaseEntityAdminForm;
+use Doctrine\ORM\EntityManagerInterface;
+use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\Routing\Annotation\Route;
+
+/**
+ * @Route("/attachment_type")
+ * @package App\Controller
+ */
+class AttachmentTypeController extends AbstractController
+{
+    /**
+     * @Route("/{id}/edit", requirements={"id"="\d+"}, name="attachment_type_edit")
+     * @Route("/{id}/", requirements={"id"="\d+"})
+     */
+    public function edit(AttachmentType $entity, Request $request, EntityManagerInterface $em)
+    {
+
+        $form = $this->createForm(BaseEntityAdminForm::class, $entity);
+
+        $form->handleRequest($request);
+        if ($form->isSubmitted() && $form->isValid()) {
+            $em->persist($entity);
+            $em->flush();
+        }
+
+        return $this->render('AdminPages/AttachmentTypeAdmin.html.twig', [
+            'entity' => $entity,
+            'form' => $form->createView()
+        ]);
+    }
+
+    /**
+     * @Route("/new")
+     *
+     * @return \Symfony\Component\HttpFoundation\Response
+     */
+    public function new(Request $request, EntityManagerInterface $em)
+    {
+        $new_entity = new AttachmentType();
+
+        $this->denyAccessUnlessGranted('create', $new_entity);
+
+        $form = $this->createForm(BaseEntityAdminForm::class, $new_entity);
+
+        $form->handleRequest($request);
+
+        if ($form->isSubmitted() && $form->isValid()) {
+            $em->persist($new_entity);
+            $em->flush();
+            //$this->addFlash('success', $translator->trans('part.created_flash'));
+
+            return $this->redirectToRoute('attachment_type_edit', ['id' => $new_entity->getID()]);
+        }
+
+        return $this->render('AdminPages/AttachmentTypeAdmin.html.twig', [
+            'entity' => $new_entity,
+            'form' => $form->createView()
+        ]);
+    }
+}

src/Entity/AttachmentType.php

@@ -23,6 +23,7 @@ declare(strict_types=1);
 
 namespace App\Entity;
 
+use App\Validator\Constraints\NoneOfItsChildren;
 use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\ORM\Mapping as ORM;
 

src/Entity/DBElement.php

@@ -50,9 +50,11 @@ abstract class DBElement
      * Get the ID. The ID can be zero, or even negative (for virtual elements). If an elemenent is virtual, can be
      * checked with isVirtualElement().
      *
-     * @return int the ID of this element
+     * Returns null, if the element is not saved to the DB yet.
+     *
+     * @return int|null the ID of this element
      */
-    final public function getID(): int
+    final public function getID(): ?int
     {
         return (int) $this->id;
     }

src/Entity/NamedDBElement.php

@@ -74,20 +74,22 @@ abstract class NamedDBElement extends DBElement
 
     /**
      * Returns the last time when the element was modified.
+     * Returns null if the element was not yet saved to DB yet.
      *
-     * @return \DateTime The time of the last edit.
+     * @return \DateTime|null The time of the last edit.
      */
-    public function getLastModified(): \DateTime
+    public function getLastModified(): ?\DateTime
     {
         return $this->lastModified;
     }
 
     /**
      * Returns the date/time when the element was created.
+     * Returns null if the element was not yet saved to DB yet.
      *
-     * @return \DateTime The creation time of the part.
+     * @return \DateTime|null The creation time of the part.
      */
-    public function getAddedDate(): \DateTime
+    public function getAddedDate(): ?\DateTime
     {
         return $this->addedDate;
     }

src/Entity/StructuralDBElement.php

@@ -23,9 +23,9 @@ declare(strict_types=1);
 
 namespace App\Entity;
 
-use Doctrine\Common\Collections\ArrayCollection;
 use Doctrine\ORM\Mapping as ORM;
 use Doctrine\ORM\PersistentCollection;
+use App\Validator\Constraints\NoneOfItsChildren;
 
 /**
  * All elements with the fields "id", "name" and "parent_id" (at least).
@@ -53,6 +53,7 @@ abstract class StructuralDBElement extends AttachmentContainingDBElement
     protected $children;
     /**
      * @var StructuralDBElement
+     * @NoneOfItsChildren()
      */
     protected $parent;
 
@@ -97,10 +98,10 @@ abstract class StructuralDBElement extends AttachmentContainingDBElement
 
         //Check if both elements compared, are from the same type:
         if ($class_name != \get_class($another_element)) {
-            throw new \InvalidArgumentException('isChildOf() funktioniert nur mit Elementen des gleichen Typs!');
+            throw new \InvalidArgumentException('isChildOf() only works for objects of the same type!');
         }
 
-        if (null == $this->getID()) { // this is the root node
+        if (null == $this->getParent()) { // this is the root node
             return false;
         }
 
@@ -116,13 +117,13 @@ abstract class StructuralDBElement extends AttachmentContainingDBElement
      ******************************************************************************/
 
     /**
-     * @brief Get the parent-ID
+     * Get the parent-ID
      *
-     * @retval integer          * the ID of the parent element
+     * @return integer          * the ID of the parent element
      *                          * NULL means, the parent is the root node
      *                          * the parent ID of the root node is -1
      */
-    public function getParentID(): int
+    protected function getParentID(): int
     {
         return $this->parent_id ?? self::ID_ROOT_ELEMENT; //Null means root element
     }
@@ -139,14 +140,12 @@ abstract class StructuralDBElement extends AttachmentContainingDBElement
 
     /**
      *  Get the comment of the element.
-     *
+
-     * @param bool $parse_bbcode Should BBCode converted to HTML, before returning
-     *
      * @return string the comment
      */
-    public function getComment(bool $parse_bbcode = true): string
+    public function getComment(): ?string
     {
-        return htmlspecialchars($this->comment ?? '');
+        return $this->comment;
     }
 
     /**
@@ -179,8 +178,6 @@ abstract class StructuralDBElement extends AttachmentContainingDBElement
      * @param string $delimeter the delimeter of the returned string
      *
      * @return string the full path (incl. the name of this element), delimeted by $delimeter
-     *
-     * @throws Exception if there was an error
      */
     public function getFullPath(string $delimeter = self::PATH_DELIMITER_ARROW): string
     {
@@ -189,9 +186,13 @@ abstract class StructuralDBElement extends AttachmentContainingDBElement
             $this->full_path_strings[] = $this->getName();
             $element = $this;
 
-            while (null != $element->parent) {
+            $overflow = 20; //We only allow 20 levels depth
+
+            while (null != $element->parent && $overflow >= 0) {
                 $element = $element->parent;
                 $this->full_path_strings[] = $element->getName();
+                //Decrement to prevent mem overflow.
+                $overflow--;
             }
 
             $this->full_path_strings = array_reverse($this->full_path_strings);
@@ -219,143 +220,31 @@ abstract class StructuralDBElement extends AttachmentContainingDBElement
      ******************************************************************************/
 
     /**
-     * Change the parent ID of this element.
+     * Sets the new parent object
-     *
+     * @param self $new_parent The new parent object
-     * @param int|null $new_parent_id * the ID of the new parent element
+     * @return StructuralDBElement
-     *                                * NULL if the parent should be the root node
      */
-    public function setParentID($new_parent_id): self
+    public function setParent(?self $new_parent) : self
     {
-        $this->parent_id = $new_parent_id;
+        /*
+        if ($new_parent->isChildOf($this)) {
+            throw new \InvalidArgumentException('You can not use one of the element childs as parent!');
+        } */
+
+        $this->parent = $new_parent;
 
         return $this;
     }
 
     /**
      *  Set the comment.
-     *
      * @param string $new_comment the new comment
-     *
+     * @return StructuralDBElement
-     * @throws Exception if there was an error
      */
-    public function setComment(string $new_comment): self
+    public function setComment(?string $new_comment): self
     {
         $this->comment = $new_comment;
 
         return $this;
     }
-
-    /********************************************************************************
-     *
-     *   Tree / Table Builders
-     *
-     *********************************************************************************/
-
-    /**
-     * Build a HTML tree with all subcategories of this element.
-     *
-     * This method prints a <option>-Line for every item.
-     * <b>The <select>-tags are not printed here, you have to print them yourself!</b>
-     * Deeper levels have more spaces in front.
-     *
-     * @param int    $selected_id  the ID of the selected item
-     * @param bool   $recursive    if true, the tree will be recursive
-     * @param bool   $show_root    if true, the root node will be displayed
-     * @param string $root_name    if the root node is the very root element, you can set its name here
-     * @param string $value_prefix This string is used as a prefix before the id in the value part of the option.
-     *
-     * @return string HTML string if success
-     *
-     * @throws Exception if there was an error
-     */
-    public function buildHtmlTree(
-        $selected_id = null,
-        bool $recursive = true,
-        bool $show_root = true,
-        string $root_name = '$$',
-        string $value_prefix = ''
-    ): string {
-        if ('$$' == $root_name) {
-            $root_name = _('Oberste Ebene');
-        }
-
-        $html = array();
-
-        if ($show_root) {
-            $root_level = $this->getLevel();
-            if ($this->getID() > 0) {
-                $root_name = htmlspecialchars($this->getName());
-            }
-
-            $html[] = '<option value="'.$value_prefix.$this->getID().'">'.$root_name.'</option>';
-        } else {
-            $root_level = $this->getLevel() + 1;
-        }
-
-        // get all subelements
-        $subelements = $this->getSubelements($recursive);
-
-        foreach ($subelements as $element) {
-            $level = $element->getLevel() - $root_level;
-            $selected = ($element->getID() == $selected_id) ? 'selected' : '';
-
-            $html[] = '<option '.$selected.' value="'.$value_prefix.$element->getID().'">';
-            for ($i = 0; $i < $level; ++$i) {
-                $html[] = '&nbsp;&nbsp;&nbsp;';
-            }
-            $html[] = htmlspecialchars($element->getName()).'</option>';
-        }
-
-        return implode("\n", $html);
-    }
-
-    /**
-     * Creates a template loop for a Breadcrumb bar, representing the structural DB element.
-     *
-     * @param $page string The base page, to which the breadcrumb links should be directing to.
-     * @param $parameter string The parameter, which selects the ID of the StructuralDBElement.
-     * @param bool   $show_root Show the root as its own breadcrumb.
-     * @param string $root_name The label which should be used for the root breadcrumb.
-     *
-     * @return array An Loop containing multiple arrays, which contains href and caption for the breadcrumb.
-     */
-    public function buildBreadcrumbLoop(string $page, string $parameter, bool $show_root = false, $root_name = '$$', bool $element_is_link = false): array
-    {
-        $breadcrumb = array();
-
-        if ('$$' == $root_name) {
-            $root_name = _('Oberste Ebene');
-        }
-
-        if ($show_root) {
-            $breadcrumb[] = array('label' => $root_name,
-                'disabled' => true, );
-        }
-
-        if (!$this->current_user->canDo(static::getPermissionName(), StructuralPermission::READ)) {
-            return array('label' => '???',
-                'disabled' => true, );
-        }
-
-        $tmp = array();
-
-        if ($element_is_link) {
-            $tmp[] = array('label' => $this->getName(), 'href' => $page.'?'.$parameter.'='.$this->getID(), 'selected' => true);
-        } else {
-            $tmp[] = array('label' => $this->getName(), 'selected' => true);
-        }
-
-        $parent_id = $this->getParentID();
-        while ($parent_id > 0) {
-            /** @var StructuralDBElement $element */
-            $element = static::getInstance($this->database, $this->current_user, $this->log, $parent_id);
-            $parent_id = $element->getParentID();
-            $tmp[] = array('label' => $element->getName(), 'href' => $page.'?'.$parameter.'='.$element->getID());
-        }
-        $tmp = array_reverse($tmp);
-
-        $breadcrumb = array_merge($breadcrumb, $tmp);
-
-        return $breadcrumb;
-    }
 }

src/Form/BaseEntityAdminForm.php

@@ -0,0 +1,76 @@
+<?php
+/**
+ *
+ * part-db version 0.1
+ * Copyright (C) 2005 Christoph Lechner
+ * http://www.cl-projects.de/
+ *
+ * part-db version 0.2+
+ * Copyright (C) 2009 K. Jacobs and others (see authors.php)
+ * http://code.google.com/p/part-db/
+ *
+ * Part-DB Version 0.4+
+ * Copyright (C) 2016 - 2019 Jan Böhmer
+ * https://github.com/jbtronics
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ *
+ */
+
+namespace App\Form;
+
+
+use FOS\CKEditorBundle\Form\Type\CKEditorType;
+use Symfony\Bridge\Doctrine\Form\Type\EntityType;
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\Extension\Core\Type\ResetType;
+use Symfony\Component\Form\Extension\Core\Type\SubmitType;
+use Symfony\Component\Form\Extension\Core\Type\TextType;
+use Symfony\Component\Form\FormBuilderInterface;
+use Symfony\Component\Security\Core\Security;
+
+class BaseEntityAdminForm extends AbstractType
+{
+
+    protected $security;
+
+    public function __construct(Security $security)
+    {
+        $this->security = $security;
+    }
+
+
+    public function buildForm(FormBuilderInterface $builder, array $options)
+    {
+        $entity = $options['data'];
+
+        $builder
+            ->add('name', TextType::class, ['empty_data' => '', 'label' => 'name.label',
+                'attr' => ['placeholder' => 'part.name.placeholder'],
+                'disabled' => !$this->security->isGranted('edit', $entity), ])
+
+            ->add('parent', EntityType::class, ['class' => get_class($entity), 'choice_label' => 'full_path',
+                'attr' => ['class' => 'selectpicker', 'data-live-search' => true], 'required' => false, 'label' => 'parent.label',
+                'disabled' => !$this->security->isGranted('move', $entity), ])
+
+            ->add('comment', CKEditorType::class, ['required' => false,
+                'label' => 'comment.label', 'attr' => ['rows' => 4], 'help' => 'bbcode.hint',
+                'disabled' => !$this->security->isGranted('edit', $entity)])
+
+            //Buttons
+            ->add('save', SubmitType::class, ['label' => 'part.edit.save'])
+            ->add('reset', ResetType::class, ['label' => 'part.edit.reset']);
+    }
+}

src/Security/Voter/StructureVoter.php

@@ -0,0 +1,109 @@
+<?php
+/**
+ *
+ * part-db version 0.1
+ * Copyright (C) 2005 Christoph Lechner
+ * http://www.cl-projects.de/
+ *
+ * part-db version 0.2+
+ * Copyright (C) 2009 K. Jacobs and others (see authors.php)
+ * http://code.google.com/p/part-db/
+ *
+ * Part-DB Version 0.4+
+ * Copyright (C) 2016 - 2019 Jan Böhmer
+ * https://github.com/jbtronics
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ *
+ */
+
+namespace App\Security\Voter;
+
+
+use App\Entity\AttachmentType;
+use App\Entity\Category;
+use App\Entity\Device;
+use App\Entity\Footprint;
+use App\Entity\Manufacturer;
+use App\Entity\Storelocation;
+use App\Entity\Supplier;
+use App\Entity\User;
+
+class StructureVoter extends ExtendedVoter
+{
+
+    /**
+     * Determines if the attribute and subject are supported by this voter.
+     *
+     * @param string $attribute An attribute
+     * @param mixed $subject The subject to secure, e.g. an object the user wants to access or any other PHP type
+     *
+     * @return bool True if the attribute and subject are supported, false otherwise
+     */
+    protected function supports($attribute, $subject)
+    {
+        $permission_name = $this->instanceToPermissionName($subject);
+        //If permission name is null, then the subject is not supported
+        return ($permission_name !== null) && $this->resolver->isValidOperation($permission_name, $attribute);
+
+    }
+
+    /**
+     * Maps a instance type to the permission name.
+     * @param $subject mixed The subject for which the permission name should be generated.
+     * @return string|null The name of the permission for the subject's type or null, if the subject is not supported.
+     */
+    protected function instanceToPermissionName($subject) : ?string
+    {
+        $class_name = get_class($subject);
+        switch ($class_name) {
+            case AttachmentType::class:
+                return 'attachment_types';
+            case Category::class:
+                return 'categories';
+            case Device::class:
+                return 'devices';
+            case Footprint::class:
+                return 'footprints';
+            case Manufacturer::class:
+                return 'manufacturers';
+            case Storelocation::class:
+                return 'storelocations';
+            case Supplier::class:
+                return 'suppliers';
+        }
+        //When the class is not supported by this class return null
+        return null;
+    }
+
+    /**
+     * Similar to voteOnAttribute, but checking for the anonymous user is already done.
+     * The current user (or the anonymous user) is passed by $user.
+     *
+     * @param $attribute
+     * @param $subject
+     * @param User $user
+     *
+     * @return bool
+     */
+    protected function voteOnUser($attribute, $subject, User $user): bool
+    {
+        $permission_name = $this->instanceToPermissionName($subject);
+        //Just resolve the permission
+        return $this->resolver->inherit($user, $permission_name, $attribute) ?? false;
+    }
+
+
+}

src/Validator/Constraints/NoneOfItsChildren.php

@@ -0,0 +1,54 @@
+<?php
+/**
+ *
+ * part-db version 0.1
+ * Copyright (C) 2005 Christoph Lechner
+ * http://www.cl-projects.de/
+ *
+ * part-db version 0.2+
+ * Copyright (C) 2009 K. Jacobs and others (see authors.php)
+ * http://code.google.com/p/part-db/
+ *
+ * Part-DB Version 0.4+
+ * Copyright (C) 2016 - 2019 Jan Böhmer
+ * https://github.com/jbtronics
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ *
+ */
+
+namespace App\Validator\Constraints;
+
+use Symfony\Component\Validator\Constraint;
+
+/**
+ * Constraints the parent property on StructuralDBElement objects in the way, that neither the object self or any
+ * of its children can be assigned.
+ *
+ * @Annotation
+ * @package App\Validator\Constraints
+ */
+class NoneOfItsChildren extends Constraint
+{
+    /** @var string The message used if it is tried to assign a object as its own parent */
+    public $self_message = 'validator.noneofitschild.self';
+    /** @var string The message used if it is tried to use one of the children for as parent */
+    public $children_message = 'validator.noneofitschild.children';
+
+    public function validatedBy()
+    {
+        return parent::validatedBy(); // TODO: Change the autogenerated stub
+    }
+}

src/Validator/Constraints/NoneOfItsChildrenValidator.php

@@ -0,0 +1,88 @@
+<?php
+/**
+ *
+ * part-db version 0.1
+ * Copyright (C) 2005 Christoph Lechner
+ * http://www.cl-projects.de/
+ *
+ * part-db version 0.2+
+ * Copyright (C) 2009 K. Jacobs and others (see authors.php)
+ * http://code.google.com/p/part-db/
+ *
+ * Part-DB Version 0.4+
+ * Copyright (C) 2016 - 2019 Jan Böhmer
+ * https://github.com/jbtronics
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ *
+ */
+
+namespace App\Validator\Constraints;
+
+
+use App\Entity\StructuralDBElement;
+use Symfony\Bundle\MakerBundle\Str;
+use Symfony\Component\Form\Exception\UnexpectedTypeException;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+
+/**
+ * The validator for the NoneOfItsChildren annotation.
+ * @package App\Validator\Constraints
+ */
+class NoneOfItsChildrenValidator extends ConstraintValidator
+{
+    /**
+     * Checks if the passed value is valid.
+     *
+     * @param mixed $value The value that should be validated
+     * @param Constraint $constraint The constraint for the validation
+     */
+    public function validate($value, Constraint $constraint)
+    {
+        if (!$constraint instanceof NoneOfItsChildren) {
+            throw new UnexpectedTypeException($constraint, NoneOfItsChildren::class);
+        }
+
+        // custom constraints should ignore null and empty values to allow
+        // other constraints (NotBlank, NotNull, etc.) take care of that
+        if (null === $value || '' === $value) {
+            return;
+        }
+
+        //Check if the object is assigned to itself
+        /** @var StructuralDBElement $entity */
+        $entity = $this->context->getObject();
+        /** @var StructuralDBElement $value */
+
+        // Check if the targeted parent is the object itself:
+        $entity_id = $entity->getID();
+        if ($entity_id !== null && $entity_id === $value->getID()) {
+            //Set the entity to a valid state
+            $entity->setParent(null);
+            $this->context->buildViolation($constraint->self_message)->addViolation();
+            //The other things can not happen.
+            return;
+        }
+
+        // Check if the targeted parent is a child object
+        if ($value->isChildOf($entity)) {
+            //Set the entity to a valid state
+            $entity->setParent(null);
+            $this->context->buildViolation($constraint->children_message)->addViolation();
+            return;
+        }
+    }
+}

templates/AdminPages/AttachmentTypeAdmin.html.twig

@@ -0,0 +1,5 @@
+{% extends "AdminPages/EntityAdminBase.html.twig" %}
+
+{% block card_title %}
+    <i class="fas fa-file-alt fa-fw"></i> {% trans %}attachment_type.caption{% endtrans %}
+{% endblock %}

templates/AdminPages/EntityAdminBase.html.twig

@@ -0,0 +1,82 @@
+{% extends "main_card.html.twig" %}
+
+{% block card_content %}
+    <div class="row">
+        <div class="col-4">
+
+        </div>
+
+        <div class="col-8">
+
+            {{ form_start(form) }}
+
+            <fieldset>
+                <legend>
+                    {% if entity.ID %}
+                        <strong>{% trans with {'%name': entity.name} %}edit.caption{% endtrans %}</strong>
+                    {% else %}
+                        <strong>{% trans %}new.caption{% endtrans %}</strong>
+                    {% endif %}
+                </legend>
+
+                <ul class="nav nav-tabs mt-2">
+                    <li class="nav-item"><a class="link-anchor active nav-link" data-toggle="tab" href="#home">standard.label</a></li>
+                    <li class="nav-item"><a data-toggle="tab" class="link-anchor nav-link" href="#info">infos.label</a></li>
+                </ul>
+
+                <div class="tab-content mb-3 mt-3">
+                    <div id="home" class="tab-pane fade show active">
+                        {{ form_row(form.name) }}
+                        {{ form_row(form.parent) }}
+                        {% block additional_controls %}{% endblock %}
+                        {{ form_row(form.comment) }}
+                    </div>
+
+                    <div id="info" class="tab-pane fade">
+                        <div class="form-group row">
+                            <label class="col-form-label col-md-3">{% trans %}id.label{% endtrans %}</label>
+                            <div class="col-md-9">
+                                <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>
+                            <div class="col-md-9">
+                                <p class="form-control-plaintext">
+                                    {% if entity.addedDate %}
+                                        {{ entity.addedDate | localizeddate("long") }}
+                                    {% else %}
+                                        -
+                                    {% endif %}
+                                </p>
+                            </div>
+                        </div>
+
+                        <div class="form-group row">
+                            <label class="col-form-label col-md-3">{% trans %}lastModified{% endtrans %}</label>
+                            <div class="col-md-9">
+                                <p class="form-control-plaintext">
+                                    {% if entity.lastModified %}
+                                        {{ entity.lastModified | localizeddate("long") }}
+                                    {% else %}
+                                        -
+                                    {% endif %}
+                                </p>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+
+                {{ form_row(form.save) }}
+                {{ form_row(form.reset) }}
+
+
+
+            </fieldset>
+
+            {{ form_end(form) }}
+        </div>
+
+    </div>
+{% endblock %}