[10.x] Ordering by model's custom created_at column (laravel#801)

* Use Eloquent model's created at timestamp for ordering

* Add test

* Whoops, re-add test

src/Builder.php

@@ -225,8 +225,12 @@ public function orderBy($column, $direction = 'asc')
      * @param  string  $column
      * @return $this
      */
-    public function latest($column = 'created_at')
+    public function latest($column = null)
     {
+        if (is_null($column)) {
+            $column = $this->model->getCreatedAtColumn() ?? 'created_at';
+        }
+
         return $this->orderBy($column, 'desc');
     }
 
@@ -236,8 +240,12 @@ public function latest($column = 'created_at')
      * @param  string  $column
      * @return $this
      */
-    public function oldest($column = 'created_at')
+    public function oldest($column = null)
     {
+        if (is_null($column)) {
+            $column = $this->model->getCreatedAtColumn() ?? 'created_at';
+        }
+
         return $this->orderBy($column, 'asc');
     }
 

tests/Feature/CollectionEngineTest.php

@@ -6,6 +6,7 @@
 use Illuminate\Foundation\Testing\LazilyRefreshDatabase;
 use Laravel\Scout\Tests\Fixtures\SearchableModelWithUnloadedValue;
 use Laravel\Scout\Tests\Fixtures\SearchableUserModel;
+use Laravel\Scout\Tests\Fixtures\SearchableUserModelWithCustomCreatedAt;
 use Laravel\Scout\Tests\Fixtures\SearchableUserModelWithCustomSearchableData;
 use Orchestra\Testbench\Concerns\WithLaravelMigrations;
 use Orchestra\Testbench\Concerns\WithWorkbench;
@@ -142,6 +143,14 @@ public function test_it_can_order_by_latest_and_oldest()
         $this->assertEquals('Taylor Otwell', $models[0]->name);
     }
 
+    public function test_it_can_order_by_custom_model_created_at_timestamp()
+    {
+        $query = SearchableUserModelWithCustomCreatedAt::search()->latest();
+
+        $this->assertCount(1, $query->orders);
+        $this->assertEquals('created', $query->orders[0]['column']);
+    }
+
     public function test_it_calls_make_searchable_using_before_searching()
     {
         Model::preventAccessingMissingAttributes(true);

tests/Fixtures/SearchableUserModelWithCustomCreatedAt.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Laravel\Scout\Tests\Fixtures;
+
+use Illuminate\Foundation\Auth\User as Model;
+use Laravel\Scout\Searchable;
+
+class SearchableUserModelWithCustomCreatedAt extends Model
+{
+    use Searchable;
+
+    protected $table = 'users';
+
+    public const CREATED_AT = 'created';
+}