MNT Object for Nested GridField testing

_config/extensions.yml

@@ -15,6 +15,16 @@ SilverStripe\FrameworkTest\Model\Employee:
     extensions:
     - SilverStripe\FrameworkTest\Extension\TestDataObjectExtension
 
+SilverStripe\FrameworkTest\Fields\NestedGridField\RootNode:
+    extensions:
+    - SilverStripe\FrameworkTest\Extension\TestDataObjectExtension
+SilverStripe\FrameworkTest\Fields\NestedGridField\BranchNode:
+    extensions:
+    - SilverStripe\FrameworkTest\Extension\TestDataObjectExtension
+SilverStripe\FrameworkTest\Fields\NestedGridField\LeafNode:
+    extensions:
+    - SilverStripe\FrameworkTest\Extension\TestDataObjectExtension
+
 SilverStripe\ORM\DatabaseAdmin:
   extensions:
     - SilverStripe\FrameworkTest\GridFieldArbitraryData\DatabaseBuildExtension

code/fields/NestedGridField/BranchNode.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace SilverStripe\FrameworkTest\Fields\NestedGridField;
+
+use SilverStripe\Forms\GridField\GridFieldConfig;
+use SilverStripe\Forms\GridField\GridFieldConfig_RecordEditor;
+use SilverStripe\ORM\DataObject;
+use Symbiote\GridFieldExtensions\GridFieldNestedForm;
+
+class BranchNode extends DataObject
+{
+  private static $table_name = 'NestedGridField_BranchNode';
+
+  private static $db = [
+    'Name' => 'Varchar(50)',
+    'Category' => 'Varchar(50)',
+  ];
+
+  private static $has_one = [
+    'RootNode' => RootNode::class,
+  ];
+
+  private static $has_many = [
+    'LeafNodes' => LeafNode::class,
+  ];
+
+  private static $summary_fields = [
+    'Name',
+    'Category',
+  ];
+
+  public function getNestedConfig(): GridFieldConfig
+  {
+      $config = new GridFieldConfig_RecordEditor();
+      $config->addComponent(GridFieldNestedForm::create()->setRelationName('LeafNodes'));
+      return $config;
+  }
+}

code/fields/NestedGridField/LeafNode.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace SilverStripe\FrameworkTest\Fields\NestedGridField;
+
+use SilverStripe\Forms\GridField\GridFieldConfig;
+use SilverStripe\Forms\GridField\GridFieldConfig_RecordEditor;
+use SilverStripe\ORM\DataObject;
+use SilverStripe\ORM\Hierarchy\Hierarchy;
+use Symbiote\GridFieldExtensions\GridFieldNestedForm;
+
+class LeafNode extends DataObject
+{
+    private static $table_name = 'NestedGridField_LeafNode';
+
+    private static $db = [
+        'Name' => 'Varchar(50)',
+        'Category'=>'Varchar(255)',
+    ];
+
+    private static $has_one = [
+        'BranchNode' => BranchNode::class,
+    ];
+
+    private static $summary_fields = [
+        'Name',
+        'Category',
+    ];
+}

code/fields/NestedGridField/NestedGridFieldAdmin.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace SilverStripe\FrameworkTest\Fields\NestedGridField;
+
+use SilverStripe\Admin\ModelAdmin;
+use SilverStripe\Forms\GridField\GridFieldConfig;
+use SilverStripe\Forms\GridField\GridFieldConfig_RecordViewer;
+use Symbiote\GridFieldExtensions\GridFieldNestedForm;
+
+class NestedGridFieldAdmin extends ModelAdmin
+{
+    private static string $url_segment = 'nested-gridfield-section';
+    private static string $menu_title = 'Nested GridField Section';
+    private static string $menu_icon_class = 'font-icon-block-banner';
+
+    private static array $managed_models = [
+        RootNode::class,
+    ];
+
+    public function getGridFieldConfig(): GridFieldConfig
+	{
+		$config = parent::getGridFieldConfig();
+        $config->addComponent(GridFieldNestedForm::create()->setRelationName('BranchNodes'));
+		return $config;
+	}
+}

code/fields/NestedGridField/RootNode.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace SilverStripe\FrameworkTest\Fields\NestedGridField;
+
+use SilverStripe\ORM\DataObject;
+
+class RootNode extends DataObject
+{
+  private static $table_name = 'NestedGridField_RootNode';
+
+  private static $db = [
+    'Name' => 'Varchar(50)',
+  ];
+
+  private static $has_many = [
+    'BranchNodes' => BranchNode::class,
+  ];
+}