fix: delete conversation when no messages are left

extensions/messages/js/src/forum/utils/MessageControls.tsx

@@ -59,6 +59,22 @@ const MessageControls = {
 
     return message.delete().then(() => {
       context.attrs.state.remove(message);
+
+      const noMessagesLeft =
+        context.attrs.state.getAllItems().filter((m) => {
+          const mDialog = m.dialog();
+          const messageDialog = message.dialog();
+
+          if (!mDialog || !messageDialog) return false;
+
+          return mDialog?.id() === messageDialog!.id();
+        }).length === 0;
+
+      if (noMessagesLeft && message.dialog()) {
+        app.dialogs.remove(message.dialog()!);
+        m.route.set(app.route('messages'));
+      }
+
       m.redraw();
     });
   },

extensions/messages/src/DialogMessage.php

@@ -70,6 +70,18 @@ class DialogMessage extends AbstractModel implements Formattable
                     ->toSql()
                 .')');
         });
+
+        static::deleted(function (self $message) {
+            if ($message->dialog) {
+                if ($message->dialog->messages()->count() === 0) {
+                    $message->dialog->delete();
+                } elseif ($message->dialog->first_message_id === $message->id) {
+                    $message->dialog->setFirstMessage(
+                        $message->dialog->messages()->oldest('id')->first()
+                    );
+                }
+            }
+        });
     }
 
     public function dialog(): BelongsTo