Add upgrade exclusion rules

code/forms/SubsitesTreeDropdownField.php

@@ -23,6 +23,12 @@ class SubsitesTreeDropdownField extends TreeDropdownField
 
     protected $subsiteID = 0;
 
+    /**
+     * Extra HTML classes
+     *
+     * @skipUpgrade
+     * @var string[]
+     */
     protected $extraClasses = ['SubsitesTreeDropdownField'];
 
     public function Field($properties = [])

code/model/Subsite.php

@@ -209,11 +209,13 @@ class Subsite extends DataObject
 
             $SQL_host = Convert::raw2sql($host);
 
+            /** @skipUpgrade */
             if (!in_array('SubsiteDomain', DB::table_list())) {
                 // Table hasn't been created yet. Might be a dev/build, skip.
                 return 0;
             }
 
+            /** @skipUpgrade */
             $matchingDomains = DataObject::get(
                 SubsiteDomain::class,
                 "'$SQL_host' LIKE replace(\"SubsiteDomain\".\"Domain\",'*','%')",
@@ -394,6 +396,7 @@ class Subsite extends DataObject
             return self::$_cache_accessible_sites[$cacheKey];
         }
 
+        /** @skipUpgrade */
         $subsites = DataList::create(Subsite::class)
             ->where("\"Subsite\".\"Title\" != ''")
             ->leftJoin('Group_Subsites', '"Group_Subsites"."SubsiteID" = "Subsite"."ID"')
@@ -415,6 +418,7 @@ class Subsite extends DataObject
         }
 
         /** @var DataList $rolesSubsites */
+        /** @skipUpgrade */
         $rolesSubsites = DataList::create(Subsite::class)
             ->where("\"Subsite\".\"Title\" != ''")
             ->leftJoin('Group_Subsites', '"Group_Subsites"."SubsiteID" = "Subsite"."ID"')

code/pages/SubsitesVirtualPage.php

@@ -52,6 +52,7 @@ class SubsitesVirtualPage extends VirtualPage
             'Root.Main',
             DropdownField::create(
                 'CopyContentFromID_SubsiteID',
+                /** @skipUpgrade */
                 _t('SubsitesVirtualPage.SubsiteField', 'Subsite'),
                 $subsites->map('ID', 'Title')
             )->addExtraClass('subsitestreedropdownfield-chooser no-change-track'),