FIX Explicity mark nodes when searching nodes in TreeDropdownField #8621

src/Forms/TreeDropdownField.php

@@ -499,6 +499,17 @@ class TreeDropdownField extends FormField
         // Begin marking
         $markingSet->markPartialTree();
 
+        // Explicitely mark our search results if necessary
+        foreach ($this->searchIds as $id => $marked) {
+            if ($marked) {
+                $object = $this->objectForKey($id);
+                if (!$object) {
+                    continue;
+                }
+                $markingSet->markToExpose($object);
+            }
+        }
+
         // Allow to pass values to be selected within the ajax request
         $value = $request->requestVar('forceValue') ?: $this->value;
         if ($value && ($values = preg_split('/,\s*/', $value))) {

tests/php/Forms/TreeDropdownFieldTest.php

@@ -9,12 +9,17 @@ use SilverStripe\Dev\CSSContentParser;
 use SilverStripe\Dev\SapphireTest;
 use SilverStripe\Control\HTTPRequest;
 use SilverStripe\Forms\TreeDropdownField;
+use SilverStripe\ORM\Tests\HierarchyTest\TestObject;
 
 class TreeDropdownFieldTest extends SapphireTest
 {
 
     protected static $fixture_file = 'TreeDropdownFieldTest.yml';
 
+    protected static $extra_dataobjects = [
+        TestObject::class
+    ];
+
     public function testSchemaStateDefaults()
     {
         $field = new TreeDropdownField('TestTree', 'Test tree', Folder::class);
@@ -97,6 +102,38 @@ class TreeDropdownFieldTest extends SapphireTest
         );
     }
 
+    public function testTreeSearchJsonFlatlistWithLowNodeThreshold()
+    {
+        // Initialise our TreeDropDownField
+        $field = new TreeDropdownField('TestTree', 'Test tree', TestObject::class);
+        $field->config()->set('node_threshold_total', 2);
+
+        // Search for all Test object matching our criteria
+        $request = new HTTPRequest(
+            'GET',
+            'url',
+            ['search' => 'MatchSearchCriteria', 'format' => 'json', 'flatList' => '1']
+        );
+        $request->setSession(new Session([]));
+        $response = $field->tree($request);
+        $tree = json_decode($response->getBody(), true);
+        $actualNodeIDs = array_column($tree['children'], 'id');
+
+
+        // Get the list of expected node IDs from the YML Fixture
+        $expectedNodeIDs = array_map(
+            function ($key) {
+                return $this->objFromFixture(TestObject::class, $key)->ID;
+            },
+            ['zero', 'oneA', 'twoAi', 'three'] // Those are the identifiers of the object we expect our search to find
+        );
+
+        sort($actualNodeIDs);
+        sort($expectedNodeIDs);
+
+        $this->assertEquals($expectedNodeIDs, $actualNodeIDs);
+    }
+
     public function testTreeSearch()
     {
         $field = new TreeDropdownField('TestTree', 'Test tree', Folder::class);

tests/php/Forms/TreeDropdownFieldTest.yml

@@ -8,6 +8,7 @@ SilverStripe\Assets\Folder:
   folder1-subfolder1:
     Name: FileTest-folder1-subfolder1
     ParentID: =>SilverStripe\Assets\Folder.folder1
+
 SilverStripe\Assets\File:
   asdf:
     Filename: assets/FileTest.txt
@@ -24,3 +25,40 @@ SilverStripe\Assets\File:
     Filename: assets/FileTest-folder1/File1.txt
     Name: File1.txt
     ParentID: =>SilverStripe\Assets\Folder.folder1
+
+SilverStripe\ORM\Tests\HierarchyTest\TestObject:
+  zero:
+    Title: Zero MatchSearchCriteria
+  zeroA:
+    Title: Child A of Zero
+    ParentID: =>SilverStripe\ORM\Tests\HierarchyTest\TestObject.zero
+  zeroB:
+    Title: Child B of Zero
+    ParentID: =>SilverStripe\ORM\Tests\HierarchyTest\TestObject.zero
+  zeroC:
+    Title: Child C of Zero
+    ParentID: =>SilverStripe\ORM\Tests\HierarchyTest\TestObject.zero
+  one:
+    Title: One
+  oneA:
+    Title: Child A of One MatchSearchCriteria
+    ParentID: =>SilverStripe\ORM\Tests\HierarchyTest\TestObject.one
+  oneB:
+    Title: Child B of One
+    ParentID: =>SilverStripe\ORM\Tests\HierarchyTest\TestObject.one
+  oneC:
+    Title: Child C of One
+    ParentID: =>SilverStripe\ORM\Tests\HierarchyTest\TestObject.one
+  oneD:
+    Title: Child C of One
+    ParentID: =>SilverStripe\ORM\Tests\HierarchyTest\TestObject.one
+  two:
+    Title: Two
+  twoA:
+    Title: Child A of Two
+    ParentID: =>SilverStripe\ORM\Tests\HierarchyTest\TestObject.two
+  twoAi:
+    Title: Grandchild i of Child A of Two MatchSearchCriteria
+    ParentID: =>SilverStripe\ORM\Tests\HierarchyTest\TestObject.twoA
+  three:
+    Title: Three MatchSearchCriteria