Add deleteOrFail to Model (laravel#38784)

Makes it more convenient to handle delete errors in destroy actions.

src/Illuminate/Database/Eloquent/Model.php

@@ -1261,6 +1261,24 @@ public function delete()
         return true;
     }
 
+    /**
+     * Delete the model from the database within a transaction.
+     *
+     * @return bool|null
+     *
+     * @throws \Throwable
+     */
+    public function deleteOrFail()
+    {
+        if (! $this->exists) {
+            return false;
+        }
+
+        return $this->getConnection()->transaction(function () {
+            return $this->delete();
+        });
+    }
+
     /**
      * Force a hard delete on a soft deleted model.
      *