ENH Use new DataList caching (#237)

Replaces deprecated `DataObject::get_one()` and `DataObject::get_by_id()` in favour of the new DataList query caching.

Author: GuySartorelli

code/BasicFieldsTestPage.php

@@ -127,7 +127,8 @@ public function requireDefaultRecords()
     {
         parent::requireDefaultRecords();
 
-        if ($inst = DataObject::get_one('BasicFieldsTestPage') && static::config()->get('regenerate_on_build')) {
+        $inst = BasicFieldsTestPage::get()->setUseCache(true)->first();
+        if ($inst && static::config()->get('regenerate_on_build')) {
             $data = $this->getDefaultData();
             $inst->update($data);
             $inst->write();
@@ -139,7 +140,6 @@ public function requireDefaultRecords()
             $inst->Listbox()->add($thirdCat);
             $inst->CheckboxSet()->add($firstCat);
             $inst->CheckboxSet()->add($thirdCat);
-
         }
     }
 

code/TestCategory.php

@@ -36,7 +36,7 @@ public static function map()
 
     public function requireDefaultRecords()
     {
-        if (!DataObject::get_one(static::class)) {
+        if (static::get()->count() === 0) {
             foreach (array("A", "B", "C", "D") as $item) {
                 $page = new static();
                 $page->Title = "Test Category $item";

code/TestPage.php

@@ -40,7 +40,7 @@ public function requireDefaultRecords()
             return;
         }
 
-        if (!DataObject::get_one(static::class)) {
+        if (static::get()->count() === 0) {
             // Try to create common parent
             $defaultAdminService = DefaultAdminService::singleton();
             Member::actAs($defaultAdminService->findOrCreateDefaultAdmin(), function () {

code/TestRegistryPage.php

@@ -11,7 +11,7 @@ class TestRegistryPage extends RegistryPage
     {
         public function requireDefaultRecords()
         {
-            if (!DataObject::get_one(static::class)) {
+            if (static::get()->count() === 0) {
                 // Try to create common parent
                 $defaultAdminService = DefaultAdminService::singleton();
                 Member::actAs($defaultAdminService->findOrCreateDefaultAdmin(), function () {

composer.json

@@ -16,7 +16,7 @@
     ],
     "require": {
         "php": "^8.3",
-        "silverstripe/framework": "^6",
+        "silverstripe/framework": "^6.1",
         "silverstripe/cms": "^6",
         "guzzlehttp/guzzle": "^7.9",
         "fzaninotto/faker": "^1.9.2"