Webmentions were being saved with wrong model relationship

Fix the process webmention job to use the correct model relationship,
add an artisan command to update existing webmentions in the database to
use the correct model relationship.

app/Console/Commands/UpdateWebmentionsRelationship.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Models\Note;
+use Illuminate\Console\Command;
+use Illuminate\Support\Facades\DB;
+
+class UpdateWebmentionsRelationship extends Command
+{
+    /**
+     * The name and signature of the console command.
+     *
+     * @var string
+     */
+    protected $signature = 'webmentions:update-model-relationship';
+
+    /**
+     * The console command description.
+     *
+     * @var string
+     */
+    protected $description = 'Update webmentions to relate to the correct note model class';
+
+    /**
+     * Execute the console command.
+     */
+    public function handle()
+    {
+        DB::table('webmentions')
+            ->where('commentable_type', '=', 'App\Model\Note')
+            ->update(['commentable_type' => Note::class]);
+
+        $this->info('All webmentions updated to relate to the correct note model class');
+    }
+}

app/Jobs/ProcessWebMention.php

@@ -92,7 +92,7 @@ class ProcessWebMention implements ShouldQueue
         $webmention->source = $this->source;
         $webmention->target = $this->note->longurl;
         $webmention->commentable_id = $this->note->id;
-        $webmention->commentable_type = 'App\Model\Note';
+        $webmention->commentable_type = Note::class;
         $webmention->type = $type;
         $webmention->mf2 = json_encode($microformats);
         $webmention->save();