Added a basic dialog for editing/creating attachmentType elements.

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;
+        }
+    }
+}