[5.x] Cache mounted collections (#9675)

Co-authored-by: Jason Varga <jason@pixelfear.com>

src/Entries/Collection.php

@@ -474,6 +474,7 @@ public function save()
         Facades\Collection::save($this);
 
         Blink::forget('collection-handles');
+        Blink::forget('mounted-collections');
         Blink::flushStartingWith("collection-{$this->id()}");
 
         if ($isNew) {
@@ -766,6 +767,8 @@ public function delete()
 
         CollectionDeleted::dispatch($this);
 
+        Blink::forget('mounted-collections');
+
         return true;
     }
 

src/Stache/Repositories/CollectionRepository.php

@@ -47,9 +47,11 @@ public function findByMount($mount): ?Collection
             return null;
         }
 
-        return $this->all()->first(function ($collection) use ($mount) {
-            return optional($collection->mount())->id() === $mount->id();
-        });
+        return Blink::once('mounted-collections', fn () => $this
+            ->all()
+            ->keyBy(fn ($collection) => $collection->mount()?->id())
+            ->filter()
+        )->get($mount->id());
     }
 
     public function findOrFail($id): Collection

tests/Data/Entries/CollectionTest.php

@@ -500,6 +500,7 @@ public function it_saves_the_collection_through_the_api()
         Facades\Collection::shouldReceive('save')->with($collection)->once();
         Facades\Collection::shouldReceive('handleExists')->with('test')->once();
         Facades\Blink::shouldReceive('forget')->with('collection-handles')->once();
+        Facades\Blink::shouldReceive('forget')->with('mounted-collections')->once();
         Facades\Blink::shouldReceive('flushStartingWith')->with('collection-test')->once();
 
         $return = $collection->save();