added classes to links generated by views

web/themes/custom/popsu/popsu.theme

@@ -62,3 +62,46 @@ function popsu_preprocess_views_view_unformatted(&$variables) {
 // function popsu_preprocess_block(&$variables) {
 //   $t="t";
 // }
+
+function popsu_preprocess_views_view_field(&$variables){
+  // check if link to entoty option is true
+  $settings = $variables['field']->options['settings']; 
+  if ($settings['link_to_entity']) {
+    // get the entity and build the classes
+    $entity = $variables['row']->_entity;
+    // build new classes
+    $new_classes = array(
+      $entity->getEntityTypeId(),
+      $entity->getEntityTypeId().'-'.$entity->bundle(),
+      $entity->getEntityTypeId().'-'.$entity->bundle().'-'.$entity->id()
+    );
+    
+    // get the entity link and url
+    $link = $entity->toLink(); 
+    $url = $entity->toLink()->getUrl();
+
+    // set the active_class option to the url
+    $url->setOption('set_active_class', true);
+
+    // add new classes to the url (without overwriting existing once)
+    $options = $url->getOptions();
+    if($attributes = $options['attributes']){
+      if($classes = $attributes['class']){
+        $attributes['class'] +=  $new_classes;
+      }else{
+        $attributes['class'] = $new_classes;
+      }
+    }else{
+      $attributes = array(
+        "class" => $new_classes
+      );
+    }
+    $url->setOption('attributes', $attributes);
+
+    // update the url of the link
+    $link->setUrl($url);
+
+    // overwrite the output
+    $variables['output'] = $link->toRenderable();
+  } 
+}

web/themes/custom/popsu/templates/views/views-view-field.html.twig

@@ -0,0 +1,23 @@
+{#
+/**
+ * @file
+ * Default theme implementation for a single field in a view.
+ *
+ * Available variables:
+ * - view: The view that the field belongs to.
+ * - field: The field handler that can process the input.
+ * - row: The raw result of the database query that generated this field.
+ * - output: The processed output that will normally be used.
+ *
+ * When fetching output from the row this construct should be used:
+ * data = row[field.field_alias]
+ *
+ * The above will guarantee that you'll always get the correct data, regardless
+ * of any changes in the aliasing that might happen if the view is modified.
+ *
+ * @see template_preprocess_views_view_field()
+ *
+ * @ingroup themeable
+ */
+#}
+{{ output -}}