Added error when a many_many relationship could not be found

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2023, Ed Chipman
+Copyright (c) 2024, Ed Chipman
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification,

README.md

@@ -4,15 +4,14 @@ SortableGridField
 [![CI](https://github.com/UndefinedOffset/SortableGridField/actions/workflows/ci.yml/badge.svg)](https://github.com/UndefinedOffset/SortableGridField/actions/workflows/ci.yml)
 [![Latest Stable Version](https://poser.pugx.org/undefinedoffset/sortablegridfield/version.svg)](http://www.silverstripe.org/stable-download/)
 [![Latest Unstable Version](https://poser.pugx.org/undefinedoffset/sortablegridfield/v/unstable.svg)](https://packagist.org/packages/undefinedoffset/sortablegridfield)
-[![SilverStripe supported module](https://img.shields.io/badge/silverstripe-supported-0071C4.svg)](https://www.silverstripe.org/software/addons/silverstripe-commercially-supported-module-list/)
 [![Total Downloads](https://poser.pugx.org/undefinedoffset/sortablegridfield/downloads.svg)](https://packagist.org/packages/undefinedoffset/sortablegridfield)
 [![License](https://poser.pugx.org/undefinedoffset/sortablegridfield/license.svg)](https://github.com/UndefinedOffset/SortableGridField/blob/master/LICENSE)
 
-Adds drag and drop functionality to SilverStripe 4's GridField
+Adds drag and drop functionality to Silverstripe's GridField
 
 ## Requirements
 
-* SilverStripe 4.11+
+* Silverstripe 4.11+ or 5.0+
 
 ## Installation
 

composer.json

@@ -1,6 +1,6 @@
 {
 	"name": "undefinedoffset/sortablegridfield",
-	"description": "Adds drag and drop functionality to SilverStripe 4.x's GridField",
+	"description": "Adds drag and drop functionality to Silverstripe's GridField",
 	"type": "silverstripe-vendormodule",
 	"keywords": ["silverstripe", "gridfield", "sortable", "sort"],
     "license": "BSD-3-Clause",

src/Forms/GridFieldSortableRows.php

@@ -253,6 +253,10 @@ class GridFieldSortableRows extends AbstractGridFieldComponent implements GridFi
             if ($many_many) {
                 $schema = Injector::inst()->get(DataObjectSchema::class);
                 $componentDetails = $schema->manyManyComponent(get_class($owner), (!empty($this->custom_relation_name) ? $this->custom_relation_name : $gridField->getName()));
+                if (empty($componentDetails)) {
+                    user_error('Could not find the relationship "' . (!empty($this->custom_relation_name) ? $this->custom_relation_name : $gridField->getName()) . '" on "' . get_class($owner) . '"', E_USER_ERROR);
+                }
+
                 $parentField = $componentDetails['parentField'];
                 $componentField = $componentDetails['childField'];
                 $table = $componentDetails['join'];
@@ -483,6 +487,10 @@ class GridFieldSortableRows extends AbstractGridFieldComponent implements GridFi
         if ($many_many) {
             $schema = Injector::inst()->get(DataObjectSchema::class);
             $componentDetails = $schema->manyManyComponent(get_class($owner), (!empty($this->custom_relation_name) ? $this->custom_relation_name : $gridField->getName()));
+            if (empty($componentDetails)) {
+                user_error('Could not find the relationship "' . (!empty($this->custom_relation_name) ? $this->custom_relation_name : $gridField->getName()) . '" on "' . get_class($owner) . '"', E_USER_ERROR);
+            }
+
             $parentField = $componentDetails['parentField'];
             $componentField = $componentDetails['childField'];
             $table = $componentDetails['join'];