Override isGuarded method changes from upstream

laravel/framework@897d107 introduced a change to the attribute guard that prevents fields that do not exist in the database from being filled if guarded properties are specified. This breaks certain functionality (eg. the File model) which has fields that don't exist in the database but are handled separately, such as with a beforeSave event.

src/Database/Concerns/GuardsAttributes.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace October\Rain\Database\Concerns;
+
+trait GuardsAttributes
+{
+    /**
+     * Determine if the given key is guarded.
+     *
+     * This is an override of https://github.com/laravel/framework/commit/897d107775737a958dbd0b2f3ea37877c7526371
+     * and allows fields that don't exist in the database to be filled if they aren't specified as "guarded", under
+     * the pretense that they are handled in a special manner - ie. in the `beforeSave` event.
+     *
+     * @param  string  $key
+     * @return bool
+     */
+    public function isGuarded($key)
+    {
+        if (empty($this->getGuarded())) {
+            return false;
+        }
+
+        return $this->getGuarded() == ['*'] ||
+               ! empty(preg_grep('/^'.preg_quote($key).'$/i', $this->getGuarded()));
+    }
+}

src/Database/Model.php

@@ -1,7 +1,5 @@
 <?php namespace October\Rain\Database;
 
-use Db;
-use Input;
 use Closure;
 use October\Rain\Support\Arr;
 use October\Rain\Support\Str;
@@ -21,6 +19,7 @@
  */
 class Model extends EloquentModel
 {
+    use Concerns\GuardsAttributes;
     use Concerns\HasRelationships;
     use \October\Rain\Support\Traits\Emitter;
     use \October\Rain\Extension\ExtendableTrait;