feat(collection): add only() method for Collection #455

src/flextype/app/Support/Collection.php

@@ -141,6 +141,26 @@ class Collection
         return $this;
     }
 
+    /**
+     * Get a subset of the items from the given collection.
+     *
+     * @param  array  $array
+     * @param  array|string  $keys
+     * @return static
+     */
+    public function only($keys)
+    {
+        $result = [];
+
+        foreach ($this->collection->toArray() as $key => $value) {
+            $result[$key] = array_intersect_key($value, array_flip((array) $keys));
+        }
+
+        $this->collection = new ArrayCollection($result);
+
+        return $this;
+    }
+
     /**
      * Sets the where expression to evaluate when this Criteria is searched for.
      *

src/flextype/app/Support/Helpers/CollectionHelper.php

@@ -100,6 +100,11 @@ if (! function_exists('collect_filter')) {
             $collection->orderBy($bind_order_by['order_by']['field'], $bind_order_by['order_by']['direction']);
         }
 
+        // Exec: only
+        if (isset($filter['only'])) {
+            $collection->only($filter['only']);
+        }
+
         // Gets a native PHP array representation of the collection.
         switch ($bind_return) {
             case 'first':