ENH Rendering scalars in ArrayList in templates

src/View/SSViewer_Scope.php

@@ -5,6 +5,11 @@
 use ArrayIterator;
 use Countable;
 use Iterator;
+use SilverStripe\ORM\FieldType\DBBoolean;
+use SilverStripe\ORM\FieldType\DBText;
+use SilverStripe\ORM\FieldType\DBFloat;
+use SilverStripe\ORM\FieldType\DBInt;
+use SilverStripe\ORM\FieldType\DBField;
 
 /**
  * This tracks the current scope for an SSViewer instance. It has three goals:
@@ -339,6 +344,9 @@ public function next()
     public function __call($name, $arguments)
     {
         $on = $this->itemIterator ? $this->itemIterator->current() : $this->item;
+        if (is_scalar($on) || is_null($on)) {
+            $on = $this->convertPrimitiveToDBField($on);
+        }
         $retval = $on ? $on->$name(...$arguments) : null;
 
         $this->resetLocalScope();
@@ -368,4 +376,15 @@ protected function getUpIndex()
     {
         return $this->upIndex;
     }
+
+    private function convertPrimitiveToDBField(bool|string|float|int|null $value): DBField
+    {
+        return match (gettype($value)) {
+            'boolean' => DBBoolean::create()->setValue($value),
+            'string' => DBText::create()->setValue($value),
+            'double' => DBFloat::create()->setValue($value),
+            'integer' => DBInt::create()->setValue($value),
+            'NULL' => DBText::create()->setValue('NULL')
+        };
+    }
 }

tests/php/View/SSViewerTest.php

@@ -2218,4 +2218,15 @@ public function testFromStringCaching()
         $this->assertTrue(file_exists($cacheFile ?? ''), 'Cache file wasn\'t created when it was meant to');
         unlink($cacheFile ?? '');
     }
+
+    public function testPrimitivesConvertedToDBFields()
+    {
+        $data = new ArrayData([
+            'Foo' => new ArrayList(['hello', true, 456, 7.89, null])
+        ]);
+        $this->assertEqualIgnoringWhitespace(
+            'hello 1 456 7.89 NULL',
+            $this->render('<% loop $Foo %>$Me<% end_loop %>', $data)
+        );
+    }
 }