API can deal with attachments for more models. #2828

app/Repositories/PiggyBank/PiggyBankRepositoryInterface.php

@@ -44,6 +44,13 @@ interface PiggyBankRepositoryInterface
      */
     public function setCurrentAmount(PiggyBank $piggyBank, string $amount): PiggyBank;
 
+    /**
+     * @param PiggyBank $piggyBank
+     *
+     * @return Collection
+     */
+    public function getAttachments(PiggyBank $piggyBank): Collection;
+
     /**
      * @param PiggyBank $piggyBank
      * @param string    $amount