From 8ee7d3f5ae0e56b1e332ad18a8e6162365e4e4d7 Mon Sep 17 00:00:00 2001
From: Priit Perna <priit.perna@gmail.com>
Date: Wed, 17 May 2017 13:00:40 +0300
Subject: [PATCH] Added scope support to the Relation formwidget

---
 modules/backend/formwidgets/Relation.php | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/modules/backend/formwidgets/Relation.php b/modules/backend/formwidgets/Relation.php
index 6397c7afe..c5f4699e5 100644
--- a/modules/backend/formwidgets/Relation.php
+++ b/modules/backend/formwidgets/Relation.php
@@ -43,6 +43,11 @@ class Relation extends FormWidgetBase
      */
     public $emptyOption;
 
+    /**
+     * @var string Use a custom scope method for the list query.
+     */
+    public $scope;
+
     //
     // Object properties
     //
@@ -66,6 +71,7 @@ class Relation extends FormWidgetBase
             'nameFrom',
             'descriptionFrom',
             'emptyOption',
+            'scope',
         ]);
 
         if (isset($this->config->select)) {
@@ -118,6 +124,10 @@ class Relation extends FormWidgetBase
                 $query->where($relationModel->getKeyName(), '<>', $model->getKey());
             }
 
+            if ($scopeMethod = $this->scope) {
+                $query->$scopeMethod($model);
+            }
+
             // Even though "no constraints" is applied, belongsToMany constrains the query
             // by joining its pivot table. Remove all joins from the query.
             $query->getQuery()->getQuery()->joins = [];
@@ -139,6 +149,7 @@ class Relation extends FormWidgetBase
                 $result = $query->getQuery()->get();
             }
 
+
             // Some simpler relations can specify a custom local or foreign "other" key,
             // which can be detected and implemented here automagically.
             $primaryKeyName = in_array($relationType, ['hasMany', 'belongsTo', 'hasOne'])