Allow transforming of search index values (#2462)

src/Search/Searchables.php

@@ -2,6 +2,7 @@
 
 namespace Statamic\Search;
 
+use Closure;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Collection;
 use Statamic\Facades\Asset;
@@ -65,11 +66,24 @@ public function contains($searchable)
     public function fields($searchable): array
     {
         $fields = $this->index->config()['fields'];
+        $transformers = $this->index->config()['transformers'] ?? [];
 
         return collect($fields)->mapWithKeys(function ($field) use ($searchable) {
             $value = method_exists($searchable, $field) ? $searchable->{$field}() : $searchable->get($field);
 
             return [$field => $value];
+        })->flatMap(function ($value, $field) use ($transformers) {
+            if (! isset($transformers[$field]) || ! $transformers[$field] instanceof Closure) {
+                return [$field => $value];
+            }
+
+            $transformedValue = $transformers[$field]($value);
+
+            if (is_array($transformedValue)) {
+                return $transformedValue;
+            }
+
+            return [$field => $transformedValue];
         })->all();
     }
 }

tests/Search/SearchablesTest.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace Tests\Search;
+
+use Statamic\Facades\Entry;
+use Statamic\Search\Searchables;
+use Tests\TestCase;
+
+class SearchablesTest extends TestCase
+{
+    /** @test */
+    public function it_transforms_values_set_in_the_config_file()
+    {
+        config()->set('statamic.search.indexes.default', [
+            'fields' => [
+                'title',
+            ],
+            'transformers' => [
+                'title' => function ($value) {
+                    return strtoupper($value);
+                },
+            ],
+        ]);
+
+        $index = app(\Statamic\Search\Comb\Index::class, [
+            'name' => 'default',
+            'config' => config('statamic.search.indexes.default'),
+        ]);
+
+        $searchable = Entry::make()->data(['title' => 'Hello']);
+        $searchables = new Searchables($index);
+
+        $this->assertEquals([
+            'title' => 'HELLO',
+        ], $searchables->fields($searchable));
+    }
+
+    /** @test */
+    public function if_a_transformer_returns_an_array_it_gets_combined_into_the_results()
+    {
+        config()->set('statamic.search.indexes.default', [
+            'fields' => [
+                'title',
+            ],
+            'transformers' => [
+                'title' => function ($value) {
+                    return [
+                        'title' => $value,
+                        'title_upper' => strtoupper($value),
+                    ];
+                },
+            ],
+        ]);
+
+        $index = app(\Statamic\Search\Comb\Index::class, [
+            'name' => 'default',
+            'config' => config('statamic.search.indexes.default'),
+        ]);
+
+        $searchable = Entry::make()->data(['title' => 'Hello']);
+        $searchables = new Searchables($index);
+
+        $this->assertEquals([
+            'title' => 'Hello',
+            'title_upper' => 'HELLO',
+        ], $searchables->fields($searchable));
+    }
+}