instancecache trait

app/Models/Concerns/InstanceCache.php

@@ -0,0 +1,37 @@
+<?php
+
+
+namespace App\Models\Concerns;
+
+
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * Instance cache, used to avoid multiple retrieval of related models.
+ * Repeated calls to getCached() all return the same instance, without
+ * additional DB access.
+ */
+trait InstanceCache
+{
+    private static $instanceCache = [];
+
+    public static function bootInstanceCache()
+    {
+        self::retrieved(function (Model $instance) {
+            self::$instanceCache[$instance->getKey()] = $instance;
+        });
+    }
+
+    /**
+     * Find entity by ID, either in DB, or in the internal cache.
+     *
+     * @param int $id
+     * @return Model|null
+     */
+    public static function getCached($id)
+    {
+        return isset(self::$instanceCache[$id]) ?
+            self::$instanceCache[$id] :
+            (self::$instanceCache[$id] = self::find($id));
+    }
+}