Fix Update::getChat() for cases when a User banned and/or unbanned a bot

src/Objects/BaseObject.php

@@ -87,7 +87,10 @@ protected function getRelationValue(string $relationName, iterable $relationRawD
         /** @var class-string<\Telegram\Bot\Objects\BaseObject>|list<class-string<\Telegram\Bot\Objects\BaseObject>> $relation */
         $relation = $this->relations()[$relationName];
 
-        if (is_string($relation) && class_exists($relation)) {
+        if (is_string($relation)) {
+            if (! class_exists($relation)) {
+                throw new \InvalidArgumentException("Could not load “{$relationName}” relation: class “{$relation}” not found.");
+            }
             return $relation::make($relationRawData);
         }
 
@@ -102,7 +105,7 @@ protected function getRelationValue(string $relationName, iterable $relationRawD
             return $relatedObjects;
         }
 
-        throw new \InvalidArgumentException("Unknown type of the relationship data for the $relationName relation.");
+        throw new \InvalidArgumentException("Unknown type of the relationship data for the “{$relationName}” relation.");
     }
 
     /**

src/Objects/ChatMemberUpdated.php

@@ -5,14 +5,14 @@
 /**
  * Class ChatMemberUpdated.
  *
- * @link https://core.telegram.org/bots/api#message
+ * @link https://core.telegram.org/bots/api#chatmemberupdated
  *
  * @property Chat                   $chat               Chat the user belongs to.
  * @property User                   $from               Performer of the action, which resulted in the change.
  * @property int                    $date               Date the change was done in Unix time.
- * @property ChatMember             $old_chat_member    Previous information about the chat member.
- * @property ChatMember             $new_chat_member    New information about the chat member.
- * @property ChatInviteLink|null    $invite_link        (Optional). Chat invite link, which was used by the user to join the chat; for joining by invite link events only.
+ * @property ChatMember             $oldChatMember      Previous information about the chat member.
+ * @property ChatMember             $newChatMember      New information about the chat member.
+ * @property ChatInviteLink|null    $inviteLink        (Optional). Chat invite link, which was used by the user to join the chat; for joining by invite link events only.
  */
 class ChatMemberUpdated extends BaseObject
 {

src/Objects/Update.php

@@ -184,6 +184,10 @@ public function getRelatedObject()
      */
     public function getChat(): Collection
     {
+        if ($this->has('my_chat_member')) { // message is not available in such case
+            return $this->myChatMember->chat;
+        }
+
         $message = $this->getMessage();
 
         return $message->has('chat') ? $message->get('chat') : collect();

tests/Unit/Objects/UpdateTest.php

@@ -0,0 +1,38 @@
+<?php declare(strict_types=1);
+
+namespace Telegram\Bot\Tests\Unit\Objects;
+
+use PHPUnit\Framework\TestCase;
+use Telegram\Bot\Objects\Chat;
+use Telegram\Bot\Objects\Update;
+
+/** @covers \Telegram\Bot\Objects\Update */
+class UpdateTest extends TestCase
+{
+    /** @test */
+    public function it_parses_chat_relation_for_bot_kicked_event(): void
+    {
+        $update = new Update([
+            // there is no "message" key at this even type!
+            'my_chat_member' => [
+                'chat' => [
+                    'id' => 42,
+                    'first_name' => 'Firstname',
+                    'last_name' => 'Lastname',
+                    'type' => 'private',
+                ],
+            ],
+            'old_chat_member' => [
+                'user' => [], // doesn't matter in this case
+                'status' => 'member',
+            ],
+            'new_chat_member' => [
+                'user' => [], // doesn't matter in this case
+                'status' => 'kicked',
+                'until_date' => 0,
+            ],
+        ]);
+
+        $this->assertInstanceOf(Chat::class, $update->getChat());
+    }
+}