API Change public CMSEditLink to protected updateCMSEditLink

code/CMSEditLinkExtension.php

@@ -31,7 +31,7 @@
  * Note that the cms_edit_owner must implement a getCMSEditLinkForManagedDataObject() method.
  *
  * If the cms_edit_owner is a has_one relation, the class on the other end
- * of the relation must have a CMSEditLink() method.
+ * of the relation must have a getCMSEditLink() method.
  *
  * @template T of LeftAndMain|DataObject
  * @extends Extension<T&static>
@@ -70,14 +70,21 @@ public function getCMSEditLinkForManagedDataObject(DataObject $obj, string $reci
     }
 
     /**
-     * Get a link to edit this DataObject in the CMS.
+     * Provide a link to edit this DataObject in the CMS if there isn't one already.
+     * @throws LogicException if a link cannot be established
+     * e.g. if the object is not in a has_many relation or not edited inside a GridField.
      */
-    public function CMSEditLink(): string
+    protected function updateCMSEditLink(?string &$link): void
     {
+        // Don't update the link if it has already been established.
+        if ($link) {
+            return;
+        }
+
         /** @var DataObject|LeftAndMain|null $owner */
         $owner = $this->owner->getCMSEditOwner();
         if (!$owner || !$owner->exists()) {
-            return '';
+            return;
         }
 
         if (!$owner->hasMethod('getCMSEditLinkForManagedDataObject')) {
@@ -89,7 +96,7 @@ public function CMSEditLink(): string
         } else {
             $relativeLink = $owner->getCMSEditLinkForManagedDataObject($this->owner);
         }
-        return Director::absoluteURL((string) $relativeLink);
+        $link = Director::absoluteURL($relativeLink);
     }
 
     private function getCMSEditLinkForRelation(array $componentConfig, DataObject $obj, string $reciprocalRelation, FieldList $fields): string
@@ -143,7 +150,7 @@ private function constructLink(string $relation, int $id): string
         $ownerType = $this->owner->config()->get('cms_edit_owner');
         $prefix = is_a($ownerType, CMSMain::class, true) ? 'field' : 'ItemEditForm/field';
         return Controller::join_links(
-            $this->owner->CMSEditLink(),
+            $this->owner->getCMSEditLink(),
             $prefix,
             $relation,
             'item',

code/Forms/UsedOnTable.php

@@ -102,7 +102,7 @@ public function usage(HTTPRequest $request)
                 'id' => $dataObject->ID,
                 'title' => $dataObject->getTitle() ?: _t(__CLASS__ . '.UNTITLED', 'Untitled'),
                 'type' => ucfirst($dataObject->i18n_singular_name() ?? ''),
-                'link' => $dataObject->hasMethod('CMSEditLink') ? $dataObject->CMSEditLink() : null,
+                'link' => $dataObject->getCMSEditLink(),
                 'ancestors' => []
             ];
 
@@ -115,7 +115,7 @@ public function usage(HTTPRequest $request)
             foreach ($ancestorDataObjects as $ancestorDataObject) {
                 $tableRowData['ancestors'][] = [
                     'title' => $ancestorDataObject->getTitle() ?: _t(__CLASS__ . '.UNTITLED', 'Untitled'),
-                    'link' => $ancestorDataObject->hasMethod('CMSEditLink') ? $ancestorDataObject->CMSEditLink() : null,
+                    'link' => $ancestorDataObject->getCMSEditLink(),
                 ];
             }
             $usageData[] = $tableRowData;

tests/php/CMSEditLinkExtensionTest.php

@@ -72,26 +72,26 @@ public function testGetEditLinkForDataObjectException()
         $this->assertNull($root->getCMSEditLinkForManagedDataObject($nested, 'AnotherOfTheSameClass'));
     }
 
-    public function testCMSEditLink()
+    public function testGetCMSEditLink()
     {
         $root = $this->objFromFixture(ManagedDataObject::class, 'root');
         $basicNested = $this->objFromFixture(BasicNestedObject::class, 'one');
         $nested = $this->objFromFixture(NestedObject::class, 'one');
         $polymorphic = $this->objFromFixture(PolymorphicNestedObject::class, 'one');
 
         $rootUrl = "http://localhost/admin/cms-edit-test/belongsHere/EditForm/field/belongsHere/item/$root->ID";
-        $this->assertSame($rootUrl, $root->CMSEditLink());
+        $this->assertSame($rootUrl, $root->getCMSEditLink());
         $this->assertSame(
             "$rootUrl/ItemEditForm/field/BasicNested/item/$basicNested->ID",
-            $basicNested->CMSEditLink()
+            $basicNested->getCMSEditLink()
         );
         $this->assertSame(
             "$rootUrl/ItemEditForm/field/Nested/item/$nested->ID",
-            $nested->CMSEditLink()
+            $nested->getCMSEditLink()
         );
         $this->assertSame(
             "$rootUrl/ItemEditForm/field/Polymorphic/item/$polymorphic->ID",
-            $polymorphic->CMSEditLink()
+            $polymorphic->getCMSEditLink()
         );
     }
 }

tests/php/Navigator/UnversionedRecord.php

@@ -28,7 +28,7 @@ public function getMimeType()
         return 'text/html';
     }
 
-    public function CMSEditLink()
+    public function getCMSEditLink(): ?string
     {
         return null;
     }