perf -- load tree for field by tag once for request

Author: phoenix

src/Domain/Cache/ArrayCache.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace PhoenixLib\NovaNestedTreeAttachMany\Domain\Cache;
+
+use Illuminate\Support\Collection;
+
+class ArrayCache implements Cache
+{
+    /** @var $cache Collection*/
+    private $cache;
+
+    public function __construct(){
+        $this->cache = Collection::make();
+    }
+
+    public function get( $tag ): Collection
+    {
+        return $this->cache->get($tag);
+    }
+
+    public function put( $tag, $data ): void
+    {
+        $this->cache->put($tag, $data);
+    }
+
+    public function has($tag): bool
+    {
+        return $this->cache->has($tag);
+    }
+}

src/Domain/Cache/Cache.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace PhoenixLib\NovaNestedTreeAttachMany\Domain\Cache;
+
+use Illuminate\Support\Collection;
+
+interface Cache
+{
+    public function get( $tag ): Collection;
+
+    public function put( $tag, $data ): void;
+
+    public function has( $tag ): bool;
+}

src/FieldServiceProvider.php

@@ -5,6 +5,8 @@
 use Illuminate\Support\ServiceProvider;
 use Laravel\Nova\Events\ServingNova;
 use Laravel\Nova\Nova;
+use PhoenixLib\NovaNestedTreeAttachMany\Domain\Cache\ArrayCache;
+use PhoenixLib\NovaNestedTreeAttachMany\Domain\Cache\Cache;
 use PhoenixLib\NovaNestedTreeAttachMany\Domain\Relation\Handlers\BelongsToHandler;
 use PhoenixLib\NovaNestedTreeAttachMany\Domain\Relation\Handlers\BelongsToManyHandler;
 use PhoenixLib\NovaNestedTreeAttachMany\Domain\Relation\Handlers\HasManyHandler;
@@ -46,5 +48,8 @@ public function register()
         $factory->register($this->app->make(BelongsToManyHandler::class));
         $factory->register($this->app->make(BelongsToHandler::class));
         $factory->register($this->app->make(HasManyHandler::class));
+
+
+        $this->app->singleton(Cache::class, ArrayCache::class);
     }
 }

src/NestedTreeAttachManyField.php

@@ -66,10 +66,19 @@ public function __construct($name, $attribute = null, $resource = null)
             'maxHeight'         => 500,
         ]);
 
-        $tree = $this->resourceClass::newModel()::get()
-            ->toTree();
+        /** @var Domain\Cache\Cache $requestCache */
+        $forRequestCache = App::make(Domain\Cache\Cache::class);
 
-        $this->withMeta(['options' => $tree]);
+        $tag = get_class($this->resourceClass::newModel());
+
+        if(!$forRequestCache->has($tag))
+        {
+            $forRequestCache->put($tag, $this->resourceClass::newModel()::get()->toTree());
+        }
+
+        $this->withMeta([
+            'options' => $forRequestCache->get($tag)
+        ]);
     }
 
     public function searchable(bool $searchable): NestedTreeAttachManyField