Merge pull request #126 from creative-commoners/pulls/4/default-link-…

…title

NEW Default link title for each link type

README.md

@@ -65,6 +65,29 @@ class Page extends SiteTree
 
 Note that you also need to add a `has_one` relation on the `Link` model to match your `has_many` here. See [official docs about `has_many`](https://docs.silverstripe.org/en/developer_guides/model/relations/#has-many)
 
+## Default title for each link type
+
+By default, if the title for the link has not been set, then the default title will be used instead according to the type of link that is used. Default link is not stored in the database as link title. This value is used only when rendering page content. 
+
+The developer also can set his own default title value using an extension by using `updateDefaultLinkTitle` method for each link type class.
+
+```php
+<?php
+//app/src/ExternalLinkExtension
+namespace App\Extensions;
+
+use SilverStripe\Core\Extension;
+
+class ExternalLinkExtension extends Extension
+{
+    public function updateDefaultLinkTitle(&$defaultLinkTitle): void
+    {
+        $defaultLinkTitle = sprintf('External link: %s', $this->owner->ExternalUrl);
+    }
+}
+
+```
+
 ## Migrating from Shae Dawson's Linkable module
 
 https://github.com/sheadawson/silverstripe-linkable

lang/en.yml

@@ -32,3 +32,10 @@ en:
     UNAUTHORIZED: 'Unauthorized'
     UPDATE_LINK: 'Update link'
     VERSIONED_STATUS_MISMATCH: 'Linkable and LinkField do not have matching Versioned applications. Make sure that both are either un-Versioned or Versioned'
+  SilverStripe\LinkField\Models\Link:
+    LINK_FIELD_TITLE_DESCRIPTION: 'If left blank, an appropriate default title will be used on the front-end'
+    MISSING_DEFAULT_TITLE: 'No link provided'
+  SilverStripe\LinkField\Models\SiteTreeLink:
+    MISSING_DEFAULT_TITLE: 'Page missing'
+  SilverStripe\LinkField\Models\FileLink:
+    MISSING_DEFAULT_TITLE: 'File missing'

src/Models/FileLink.php

@@ -32,4 +32,17 @@ public function getURL(): string
         $file = $this->File();
         return $file->exists() ? (string) $file->getURL() : '';
     }
+
+    public function getDefaultTitle(): string
+    {
+        $file = $this->File();
+        if (!$file->exists()) {
+            return _t(
+                static::class . '.MISSING_DEFAULT_TITLE',
+                'File missing',
+            );
+        }
+
+        return (string) $this->getDescription();
+    }
 }

src/Models/Link.php

@@ -5,6 +5,7 @@
 use InvalidArgumentException;
 use ReflectionException;
 use SilverStripe\Core\ClassInfo;
+use SilverStripe\Core\Config\Config;
 use SilverStripe\Core\Injector\Injector;
 use SilverStripe\Forms\CompositeValidator;
 use SilverStripe\Forms\DropdownField;
@@ -68,6 +69,10 @@ public function getCMSFields(): FieldList
 
             $titleField = $fields->dataFieldByName('Title');
             $titleField->setTitle(_t('LinkField.LINK_FIELD_TITLE', 'Title'));
+            $titleField->setDescription(_t(
+                self::class . '.LINK_FIELD_TITLE_DESCRIPTION',
+                'If left blank, an appropriate default title will be used on the front-end',
+            ));
 
             $openInNewField = $fields->dataFieldByName('OpenInNew');
             $openInNewField->setTitle(_t('LinkField.OPEN_IN_NEW_TITLE', 'Open in new window?'));
@@ -292,4 +297,27 @@ private function getLinkTypes(): array
 
         return $types;
     }
+
+    public function getDisplayTitle(): string
+    {
+        // If we have a title, we can just bail out without any changes
+        if ($this->Title) {
+            return $this->Title;
+        }
+
+        $defaultLinkTitle = $this->getDefaultTitle();
+
+        $this->extend('updateDefaultLinkTitle', $defaultLinkTitle);
+
+        return $defaultLinkTitle;
+    }
+
+    public function getDefaultTitle(): string
+    {
+        $default = $this->getDescription() ?: $this->getURL();
+        if (!$default) {
+            $default = _t(static::class . '.MISSING_DEFAULT_TITLE', 'No link provided');
+        }
+        return $default;
+    }
 }

src/Models/SiteTreeLink.php

@@ -110,28 +110,18 @@ public function getURL(): string
         return Controller::join_links($url, $anchorSegment, $queryStringSegment);
     }
 
-    /**
-     * Try to populate link title from page title in case we don't have a title yet
-     *
-     * @return string|null
-     */
-    public function getTitle(): ?string
+    public function getDefaultTitle(): string
     {
-        $title = $this->getField('Title');
-
-        if ($title) {
-            // If we already have a title, we can just bail out without any changes
-            return $title;
-        }
-
         $page = $this->Page();
+        $pageExist = $this->Page()->exists();
 
-        if (!$page?->exists()) {
-            // We don't have a page to fall back to
-            return null;
+        if (!$pageExist) {
+            return _t(
+                static::class . '.MISSING_DEFAULT_TITLE',
+                'Page missing',
+            );
         }
 
-        // Use page title as a default value in case CMS user didn't provide the title
         return $page->Title;
     }
 }

templates/SilverStripe/LinkField/Models/Link.ss

@@ -1 +1 @@
-<a href="$URL" <% if $OpenInNew %>target="_blank" rel="noopener noreferrer"<% end_if %>>$Title</a>
+<a href="$URL" <% if $OpenInNew %>target="_blank" rel="noopener noreferrer"<% end_if %>>$DisplayTitle</a>

tests/php/Extensions/ExternalLinkExtension.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace SilverStripe\LinkField\Tests\Extensions;
+
+use SilverStripe\Dev\TestOnly;
+use SilverStripe\ORM\DataExtension;
+
+class ExternalLinkExtension extends DataExtension implements TestOnly
+{
+    public function updateDefaultLinkTitle(&$defaultLinkTitle): void
+    {
+        $defaultLinkTitle = sprintf('External Link: %s', $this->owner->getURL());
+    }
+}

tests/php/Models/LinkTest.php

@@ -20,6 +20,7 @@
 use SilverStripe\ORM\DataObject;
 use SilverStripe\ORM\ValidationException;
 use SilverStripe\Versioned\Versioned;
+use SilverStripe\LinkField\Tests\Extensions\ExternalLinkExtension;
 
 class LinkTest extends SapphireTest
 {
@@ -28,6 +29,12 @@ class LinkTest extends SapphireTest
      */
     protected static $fixture_file = 'LinkTest.yml';
 
+    protected static $required_extensions = [
+        ExternalLink::class => [
+            ExternalLinkExtension::class,
+        ],
+    ];
+
     protected function setUp(): void
     {
         parent::setUp();
@@ -78,8 +85,7 @@ public function testSiteTreeLinkTitleFallback(): void
 
         // The actual Database Title field should still be null
         $this->assertNull($model->getField('Title'));
-        // But when we fetch the field (ViewableData) it should return the value from getTitle()
-        $this->assertEquals($page->Title, $model->Title, 'We expect to get the linked Page title');
+        $this->assertEquals(null, $model->Title, 'We expect that link does not have a title');
 
         $customTitle = 'My custom title';
         $model->Title = $customTitle;
@@ -329,4 +335,76 @@ public function linkUrlCasesDataProvider(): array
             ],
         ];
     }
+
+    function linkDefaultTitleDataProvider(): array
+    {
+        return [
+            'page link' => [
+                'identifier' =>  'page-link-1',
+                'class' => SiteTreeLink::class,
+                'expected' => 'PageLink1'
+            ],
+            'email link' => [
+                'identifier' => 'email-link-with-email',
+                'class' => EmailLink::class,
+                'expected' => 'EmailLinkWithEmail'
+            ],
+            'external link' => [
+                'identifier' => 'external-link-with-url',
+                'class' => ExternalLink::class,
+                'expected' => 'ExternalLinkWithUrl'
+            ],
+            'phone link' => [
+                'identifier' => 'phone-link-with-phone',
+                'class' => PhoneLink::class,
+                'expected' => 'PhoneLinkWithPhone'
+            ],
+            'file link' => [
+                'identifier' => 'file-link-no-image',
+                'class' => FileLink::class,
+                'expected' => 'File missing'
+            ],
+            'page link with default title' => [
+                'identifier' => 'page-link-with-default-title',
+                'class' => SiteTreeLink::class,
+                'expected' => 'Page1'
+            ],
+            'page link no page default title' => [
+                'identifier' => 'page-link-no-page-default-title',
+                'class' => SiteTreeLink::class,
+                'expected' => 'Page missing'
+            ],
+            'email link with default title' => [
+                'identifier' => 'email-link-with-default-title',
+                'class' => EmailLink::class,
+                'expected' => '[email protected]'
+            ],
+            'external link with default title' => [
+                'identifier' => 'external-link-with-default-title',
+                'class' => ExternalLink::class,
+                'expected' => 'External Link: https://google.com'
+            ],
+            'phone link with default title' => [
+                'identifier' => 'phone-link-with-default-title',
+                'class' => PhoneLink::class,
+                'expected' => '+64 4 978 7330'
+            ],
+            'file link with default title' => [
+                'identifier' => 'file-link-with-default-title',
+                'class' => FileLink::class,
+                'expected' => '600x400.png'
+            ],
+        ];
+    }
+
+    /**
+     * @dataProvider linkDefaultTitleDataProvider
+     */
+    public function testDefaultLinkTitle(string $identifier, string $class, string $expected): void
+    {
+        /** @var Link $link */
+        $link = $this->objFromFixture($class, $identifier);
+
+        $this->assertEquals($expected, $link->getDisplayTitle());
+    }
 }

tests/php/Models/LinkTest.yml

@@ -6,6 +6,7 @@ SilverStripe\CMS\Model\SiteTree:
 SilverStripe\Assets\Image:
   image-1:
     Title: 'Image1'
+  image-2: null
 
 SilverStripe\LinkField\Models\Link:
   link-1:
@@ -36,31 +37,45 @@ SilverStripe\LinkField\Models\SiteTreeLink:
     QueryString: 'param1=value1&param2=option2'
     Anchor: 'my-anchor'
     Page: =>SilverStripe\CMS\Model\SiteTree.page-1
+  page-link-with-default-title:
+    Page: =>SilverStripe\CMS\Model\SiteTree.page-1
+  page-link-no-page-default-title:
+    Page: null
 
 SilverStripe\LinkField\Models\EmailLink:
   email-link-with-email:
     Title: 'EmailLinkWithEmail'
     Email: '[email protected]'
   email-link-no-email:
     Title: 'EmailLinkNoEmail'
+  email-link-with-default-title:
+    Email: '[email protected]'
 
 SilverStripe\LinkField\Models\ExternalLink:
   external-link-with-url:
     Title: 'ExternalLinkWithUrl'
     ExternalUrl: 'https://google.com'
   external-link-no-url:
     Title: 'ExternalLinkNoUrl'
+  external-link-with-default-title:
+    ExternalUrl: 'https://google.com'
 
 SilverStripe\LinkField\Models\PhoneLink:
   phone-link-with-phone:
     Title: 'PhoneLinkWithPhone'
     Phone: '+64 4 978 7330'
   phone-link-no-phone:
     Title: 'PhoneLinkNoPhone'
+  phone-link-with-default-title:
+    Phone: '+64 4 978 7330'
 
 SilverStripe\LinkField\Models\FileLink:
   file-link-with-image:
     Title: 'FileLinkWithImage'
     File: =>SilverStripe\Assets\Image.image-1
   file-link-no-image:
-    Title: 'FileLinkNoImage'
+    Title: null
+    File: =>SilverStripe\Assets\Image.image-2
+    OpenInNew: true
+  file-link-with-default-title:
+    File: =>SilverStripe\Assets\Image.image-1