dnadesign · satrun77 · Sep 10, 2025
diff --git a/README.md b/README.md
@@ -11,7 +11,7 @@ This module provides an easy way to build such tree and to add it to a page as a
 
 ## Requirements
 
-* SilverStripe 5.x
+* SilverStripe 6.x
 * (dnadesign/silvertsripe-elemental)[https://github.com/dnadesign/silverstripe-elemental]
 
 ## Screenshots

diff --git a/composer.json b/composer.json
@@ -17,9 +17,9 @@
   "minimum-stability": "dev",
   "prefer-stable": true,
   "require": {
-    "dnadesign/silverstripe-elemental": "^5",
-    "silvershop/silverstripe-hasonefield": "^4",
-    "unclecheese/display-logic": "^3"
+    "dnadesign/silverstripe-elemental": "^6",
+    "silvershop/silverstripe-hasonefield": "^5",
+    "unclecheese/display-logic": "^4"
   },
   "config": {
     "allow-plugins": {

diff --git a/src/Extensions/ElementDecisionTreeController.php b/src/Extensions/ElementDecisionTreeController.php
@@ -2,34 +2,33 @@
 
 namespace DNADesign\SilverStripeElementalDecisionTree\Extensions;
 
+use DNADesign\SilverStripeElementalDecisionTree\Model\DecisionTreeAnswer;
+use DNADesign\SilverStripeElementalDecisionTree\Model\DecisionTreeStep;
 use SilverStripe\Control\Controller;
-use SilverStripe\View\ArrayData;
-use SilverStripe\View\Requirements;
 use SilverStripe\Core\Extension;
-use DNADesign\SilverStripeElementalDecisionTree\Model\DecisionTreeStep;
-use DNADesign\SilverStripeElementalDecisionTree\Model\DecisionTreeAnswer;
+use SilverStripe\Model\ArrayData;
+use SilverStripe\ORM\FieldType\DBHTMLText;
+use SilverStripe\View\Requirements;
 
 class ElementDecisionTreeController extends Extension
 {
-
-    private static $allowed_actions = [
-        'getNextStepForAnswer'
+    private static array $allowed_actions = [
+        'getNextStepForAnswer',
     ];
 
-    public function onAfterInit()
+    public function onAfterInit(): void
     {
         Requirements::javascript('dnadesign/silverstripe-elemental-decisiontree:javascript/decision-tree.src.js');
     }
 
     /**
-    * Return the HTMl for the next step to be displayed
-    * as well as the updated URL which includes the ids of the answers
-    * leading to this next step to be returned
-    *
-    * @param stepanswerid (POST)
-    * @return json
-    */
-    public function getNextStepForAnswer()
+     * Return the HTMl for the next step to be displayed
+     * as well as the updated URL which includes the ids of the answers
+     * leading to this next step to be returned.
+     *
+     * @param stepanswerid (POST)
+     */
+    public function getNextStepForAnswer(): null|bool|string|DBHTMLText
     {
         $answerID = $this->owner->getRequest()->postVar('stepanswerid');
 
@@ -41,7 +40,7 @@ public function getNextStepForAnswer()
 
         if (!$answer || !$answer->exists()) {
             return $this->owner->httpError(
-                404, 
+                404,
                 $this->renderError('An error has occurred, please reload the page and try again!')
             );
         }
@@ -50,26 +49,27 @@ public function getNextStepForAnswer()
 
         if (!$nextStep || !$nextStep->exists()) {
             return $this->owner->httpError(
-                404, 
+                404,
                 $this->renderError('An error has occurred, please reload the page and try again!')
             );
         }
 
         $html = $this->owner->customise(new ArrayData([
             'Step' => $nextStep,
-            'Controller' => $this->owner
+            'Controller' => $this->owner,
         ]))->renderWith('DNADesign\SilverStripeElementalDecisionTree\Model\DecisionTreeStep');
 
         $pathway = $nextStep->getAnswerPathway();
 
         $nextURL = Controller::join_links(
-            $this->owner->AbsoluteLink(), '?decisionpathway='.implode(',', $pathway)
+            $this->owner->AbsoluteLink(),
+            '?decisionpathway=' . implode(',', $pathway)
         );
 
         if ($this->owner->getRequest()->isAjax()) {
             $data = [
                 'html' => $html->forTemplate(),
-                'nexturl' => $nextURL
+                'nexturl' => $nextURL,
             ];
 
             return json_encode($data);
@@ -79,12 +79,10 @@ public function getNextStepForAnswer()
     }
 
     /**
-    * Returns an array of DecisionStepID from the URL param
-    * in order to display the same question when we reload the page
-    *
-    * @return Array
-    */
-    public function getInitialPathway()
+     * Returns an array of DecisionStepID from the URL param
+     * in order to display the same question when we reload the page.
+     */
+    public function getInitialPathway(): ?array
     {
         $ids = $this->owner->getRequest()->getVar('decisionpathway');
 
@@ -96,12 +94,12 @@ public function getInitialPathway()
     }
 
     /**
-    * Check if an answer should be selected by default
-    * ie. The question depending on it is displayed
-    *
-    * @return Boolean
-    */
-    public function getIsAnswerSelected($answerID)
+     * Check if an answer should be selected by default
+     * ie. The question depending on it is displayed.
+     *
+     * @param mixed $answerID
+     */
+    public function getIsAnswerSelected($answerID): bool
     {
         if ($pathway = $this->getInitialPathway()) {
             return in_array($answerID, $pathway);
@@ -111,16 +109,16 @@ public function getIsAnswerSelected($answerID)
     }
 
     /**
-    * Gets the next step to be displayed in regards to the selected answer.
-    * Used by template to display all the relevant steps from the URL
-    *
-    * @return DecisionTreeStep
-    */
-    public function getNextStepFromSelectedAnswer($stepID)
+     * Gets the next step to be displayed in regards to the selected answer.
+     * Used by template to display all the relevant steps from the URL.
+     *
+     * @param mixed $stepID
+     */
+    public function getNextStepFromSelectedAnswer($stepID): ?DecisionTreeStep
     {
         $step = DecisionTreeStep::get()->byID($stepID);
         if ($step->exists()) {
-            foreach($step->Answers() as $answer) {
+            foreach ($step->Answers() as $answer) {
                 if ($this->getIsAnswerSelected($answer->ID)) {
                     if ($nextStep = $answer->ResultingStep()) {
                         return $nextStep;
@@ -133,13 +131,9 @@ public function getNextStepFromSelectedAnswer($stepID)
     }
 
     /**
-    * Template returned via ajax in case of an error occuring.
-    *
-    * @param string
-    *
-    * @return string
-    */
-    protected function renderError($message = '')
+     * Template returned via ajax in case of an error occuring.
+     */
+    protected function renderError(string $message = ''): string
     {
         return sprintf(
             '<div class="step step--error">
@@ -148,9 +142,8 @@ protected function renderError($message = '')
                     <span class="step-title">Sorry!</span>
                     <span class="step-content"><p>%s</p></span>
                 </div>
-            </div>', 
+            </div>',
             $message
         );
     }
-
 }
diff --git a/src/Forms/DecisionTreeStepPreview.php b/src/Forms/DecisionTreeStepPreview.php
@@ -2,30 +2,30 @@
 
 namespace DNADesign\SilverStripeElementalDecisionTree\Forms;
 
+use DNADesign\SilverStripeElementalDecisionTree\Model\DecisionTreeStep;
 use SilverStripe\Forms\FormField;
 
 /**
  * This form field is used to display the DecisionTree in the edit form of any
  * ElementDecisionTree or DecisionTreeStes. It provides a visual way of
  * navigating the tree as well as links to edit/add steps.
  */
-
 class DecisionTreeStepPreview extends FormField
 {
-    protected $step = null;
+    protected ?DecisionTreeStep $step = null;
 
-    public function __construct($name, $step = null)
+    public function __construct($name, ?DecisionTreeStep $step = null)
     {
         $this->step = $step;
         parent::__construct($name);
     }
 
-    public function getStep()
+    public function getStep(): ?DecisionTreeStep
     {
         return $this->step;
     }
 
-    public function setStep($step)
+    public function setStep(?DecisionTreeStep $step): static
     {
         $this->step = $step;
 

diff --git a/src/Forms/HasOneSelectOrCreateField.php b/src/Forms/HasOneSelectOrCreateField.php
@@ -2,32 +2,31 @@
 
 namespace DNADesign\SilverStripeElementalDecisionTree\Forms;
 
+use SilverShop\HasOneField\GridFieldHasOneEditButton;
+use SilverShop\HasOneField\HasOneButtonField;
 use SilverStripe\Forms\CompositeField;
 use SilverStripe\Forms\DropdownField;
 use SilverStripe\Forms\FormField;
-use SilverShop\HasOneField\HasOneButtonField;
-use SilverShop\HasOneField\GridFieldHasOneEditButton;
-/**
-* This a wrapper for a slightly enhanced user experience when using the
-* HasOneButtonField class.
-* By default, the HasOneButtonField only allow to create or edit the has_one object
-* This class adds a dropdown to allow to select another object or remove the relation
-* without deleting the object itself.
-* Both fields are wrapped in a CompositeField.
-*
-* @param String | Name of the has_one relationship
-* @param String | Title of the drodpwon field
-* @param FieldList or Array | Options listed in the dropdown
-* @param Object | Current has_one object, if exists
-* @param Object | The object calling this field, required by HasOneButtonField
-*/
 
+/**
+ * This a wrapper for a slightly enhanced user experience when using the
+ * HasOneButtonField class.
+ * By default, the HasOneButtonField only allow to create or edit the has_one object
+ * This class adds a dropdown to allow to select another object or remove the relation
+ * without deleting the object itself.
+ * Both fields are wrapped in a CompositeField.
+ *
+ * @param Name|string of the has_one relationship
+ * @param string|Title of the drodpwon field
+ * @param FieldList or Array | Options listed in the dropdown
+ * @param Current|object has_one object, if exists
+ * @param object|The object calling this field, required by HasOneButtonField
+ */
 class HasOneSelectOrCreateField extends CompositeField
 {
+    protected DropdownField $dropdown;
 
-    protected $dropdown;
-
-    protected $gridfield;
+    protected HasOneButtonField $gridfield;
 
     public function __construct($record, $name, $title, $options, $current, $parent)
     {
@@ -49,21 +48,20 @@ public function __construct($record, $name, $title, $options, $current, $parent)
         if ($current && $current->exists()) {
             $name = ($current->Title) ? $current->Title : $current->Name;
             if ($name) {
-                $button->setButtonName('Edit '.FormField::name_to_label($name));
+                $button->setButtonName('Edit ' . FormField::name_to_label($name));
             }
         } else {
-            $button->setButtonName('Create '.$label);
+            $button->setButtonName('Create ' . $label);
         }
 
         // Set Empty String on dropdown
-        $dropdown->setEmptyString('Select '.$label);
+        $dropdown->setEmptyString('Select ' . $label);
 
-        parent::__construct(array($this->dropdown, $this->gridfield));
+        parent::__construct([$this->dropdown, $this->gridfield]);
     }
 
-    public function getRelationName()
+    public function getRelationName(): string
     {
-        return $this->name.'ID';
+        return $this->name . 'ID';
     }
-
 }