We first introduce :messages/filter on page 208 (in Chapter 7: Account Management > Add Author’s Posts Page > Implementing the client page) where we update the :message/add event to filter based on the current page. However, I can see how it might be forgotten or missed since we don’t mention it at all between pages 212 and 283.

We’ll add a reference link to the section where we first introduce it to help alleviate this confusion for other readers.

Thanks for reading, and thanks for bringing this up!