[5.x] Support search_index tag supplemental data (#312)

* Support search_index tag supplemental data

* Supplement method should return $this

* 🍺

---------

Co-authored-by: Duncan McClean <duncan@duncanmcclean.com>
Co-authored-by: Duncan McClean <19637309+duncanmcclean@users.noreply.github.com>

src/Data/AugmentedModel.php

@@ -15,12 +15,21 @@ class AugmentedModel extends AbstractAugmented
 
     protected $resource;
 
+    protected $supplements = [];
+
     public function __construct($model)
     {
         $this->data = $model;
         $this->resource = Runway::findResourceByModel($model);
     }
 
+    public function supplement(array $data)
+    {
+        $this->supplements = $data;
+
+        return $this;
+    }
+
     public function keys()
     {
         return collect()
@@ -94,6 +103,6 @@ protected function blueprintFields()
 
     protected function getFromData($handle)
     {
-        return $this->data->$handle;
+        return $this->supplements[$handle] ?? $this->data->$handle;
     }
 }

src/Search/Searchable.php

@@ -9,13 +9,14 @@
 use Statamic\Contracts\Query\ContainsQueryableValues;
 use Statamic\Contracts\Search\Result;
 use Statamic\Contracts\Search\Searchable as Contract;
+use Statamic\Data\ContainsSupplementalData;
 use Statamic\Data\HasAugmentedInstance;
 use Statamic\Facades\Site;
 use Statamic\Search\Result as ResultInstance;
 
 class Searchable implements Contract, ContainsQueryableValues, Augmentable
 {
-    use HasAugmentedInstance;
+    use HasAugmentedInstance, ContainsSupplementalData;
 
     protected $model;
 
@@ -76,6 +77,7 @@ public function getCpSearchResultBadge()
 
     public function newAugmentedInstance(): Augmented
     {
-        return new AugmentedModel($this->model);
+        return (new AugmentedModel($this->model))
+            ->supplement($this->supplements());
     }
 }