Issue #1861852 by dawehner, tim.plunkett: Fixed Views Attachments aren't rendered anymore.

core/modules/views/lib/Drupal/views/Plugin/views/display/Attachment.php

@@ -254,18 +254,17 @@ public function attachTo(ViewExecutable $view, $display_id) {
 
     switch ($this->getOption('attachment_position')) {
       case 'before':
-        $this->view->attachment_before .= $attachment;
+        $this->view->attachment_before[] = $attachment;
         break;
       case 'after':
-        $this->view->attachment_after .= $attachment;
+        $this->view->attachment_after[] = $attachment;
         break;
       case 'both':
-        $this->view->attachment_before .= $attachment;
-        $this->view->attachment_after .= $attachment;
+        $this->view->attachment_before[] = $attachment;
+        $this->view->attachment_after[] = $attachment;
         break;
     }
 
-    $view->destroy();
   }
 
   /**

core/modules/views/lib/Drupal/views/Tests/Plugin/DisplayAttachmentTest.php

+<?php
+
+/**
+ * @file
+ * Contains \Drupal\views\Tests\Plugin\DisplayAttachmentTest.
+ */
+
+namespace Drupal\views\Tests\Plugin;
+
+/**
+ * Tests the attachment display plugin.
+ *
+ * @see Drupal\views\Plugin\views\display\Attachment
+ */
+class DisplayAttachmentTest extends PluginTestBase {
+
+  /**
+   * Views used by this test.
+   *
+   * @var array
+   */
+  public static $testViews = array('test_display_attachment');
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Display: Attachment plugin',
+      'description' => 'Tests the attachment display plugin.',
+      'group' => 'Views Plugins',
+    );
+  }
+
+  protected function setUp() {
+    parent::setUp();
+
+    $this->enableViewsTestModule();
+  }
+
+
+  /**
+   * Tests the attachment plugin.
+   */
+  protected function testAttachment() {
+    // @todo Remove that once http://drupal.org/node/1828444 got in.
+    state()->set('menu_rebuild_needed', TRUE);
+
+    $this->drupalGet('test-display-attachment');
+
+    $result = $this->xpath('//div[contains(@class, "view-content")]');
+    $this->assertEqual(count($result), 2, 'Both actual view and the attachment is rendered.');
+
+    $result = $this->xpath('//div[contains(@class, "attachment-after")]');
+    $this->assertEqual(count($result), 0, 'The attachment is not rendered after the actual view.');
+
+    $result = $this->xpath('//div[contains(@class, "attachment-before")]');
+    $this->assertEqual(count($result), 1, 'The attachment is rendered before the actual view.');
+  }
+
+}

core/modules/views/lib/Drupal/views/ViewExecutable.php

@@ -109,18 +109,18 @@ class ViewExecutable {
   public $total_rows = NULL;
 
   /**
-   * Rendered attachments to place before the view.
+   * Attachments to place before the view.
    *
-   * @var string
+   * @var array()
    */
-  public $attachment_before = '';
+  public $attachment_before = array();
 
   /**
-   * Rendered attachements to place after the view.
+   * Attachments to place after the view.
    *
-   * @var string
+   * @var array
    */
-  public $attachment_after = '';
+  public $attachment_after = array();
 
   // Exposed widget input
 

core/modules/views/tests/views_test_config/test_views/views.view.test_display_attachment.yml

+api_version: '3.0'
+base_field: id
+base_table: views_test_data
+core: 8.x
+description: ''
+disabled: '0'
+display:
+  default:
+    display_plugin: default
+    id: default
+    display_title: Master
+    position: ''
+    display_options:
+      access:
+        type: perm
+      cache:
+        type: none
+      query:
+        type: views_query
+      exposed_form:
+        type: basic
+      pager:
+        type: full
+        options:
+          items_per_page: '10'
+      style:
+        type: default
+      row:
+        type: fields
+      fields:
+        name:
+          id: name
+          table: views_test_data
+          field: name
+          label: ''
+          alter:
+            alter_text: '0'
+            make_link: '0'
+            absolute: '0'
+            trim: '0'
+            word_boundary: '0'
+            ellipsis: '0'
+            strip_tags: '0'
+            html: '0'
+          hide_empty: '0'
+          empty_zero: '0'
+          link_to_node: '1'
+      title: test_display_attachment
+  page_1:
+    display_plugin: page
+    id: page_1
+    display_title: Page
+    position: '1'
+    display_options:
+      path: test-display-attachment
+  attachment_1:
+    display_plugin: attachment
+    id: attachment_1
+    display_title: Attachment
+    position: '2'
+    display_options:
+      displays:
+        page_1: page_1
+human_name: test_display_attachment
+module: views
+name: test_display_attachment
+tag: ''

core/modules/views/theme/theme.inc

@@ -92,8 +92,18 @@ function template_preprocess_views_view(&$vars) {
     $vars['pager'] = $view->renderPager($exposed_input);
   }
 
-  $vars['attachment_before'] = !empty($view->attachment_before) ? $view->attachment_before : '';
-  $vars['attachment_after'] = !empty($view->attachment_after) ? $view->attachment_after : '';
+  if (!empty($view->attachment_before)) {
+    $vars['attachment_before'] = $view->attachment_before;
+  }
+  else {
+    $vars['attachment_before'] = array();
+  }
+  if (!empty($view->attachment_after)) {
+    $vars['attachment_after'] = $view->attachment_after;
+  }
+  else {
+    $vars['attachment_after'] = array();
+  }
 
   // Add contextual links to the view. We need to attach them to the dummy
   // $view_array variable, since contextual_preprocess() requires that they be

core/modules/views/theme/views-view.tpl.php

@@ -47,7 +47,7 @@
 
   <?php if ($attachment_before): ?>
     <div class="attachment attachment-before">
-      <?php print $attachment_before; ?>
+      <?php print render($attachment_before); ?>
     </div>
   <?php endif; ?>
 
@@ -67,7 +67,7 @@
 
   <?php if ($attachment_after): ?>
     <div class="attachment attachment-after">
-      <?php print $attachment_after; ?>
+      <?php print render($attachment_after); ?>
     </div>
   <?php endif; ?>