Beaconcms backend hooks - how to create initial changeset on page load?

Hey Roberts,

There is currently no way to custiomize mount for a specific page, because navigation between beacon pages does not trigger a mount, it’s all done via patching in the same LiveView process.

However, you can customize mount for the entire Beacon site (similar to how Event Handlers work - you don’t define them for an individual page, but for the entire site). This is done by passing the :on_mount option to beacon_site/2, which works like the normal on_mount/1 that you would define for a live_session in Phoenix.Router.

Hope this helps!

PS. the #beacon-cms channel on Elixir Slack is quite active and many users are also incorporating Ash, so please check that out as well

Oh, now that I think about it, if all you’re doing is populating an assign, that could be a better fit for LiveData, which is scoped by path - still not per-page, but at least it’s not global (also changeable at runtime!).

To do this you would:

• go to the “Live Data” section of the admin dashboard
• click the button to create a new Live Data path
• enter the path to your page(s) (can use globs e.g. /topics/:id/create)
• define the assign with whatever name and code you want

Let me know what you end up going with!

I added code in event handler:

{:noreply, assign(socket, form: AshPhoenix.Form.validate(socket.assigns.form, params))}

But on save it says:

nofile: cannot compile file (errors have been logged)

undefined variable "params"

Even tho on top there is: Variables available: params socket.

Am i missing something?

Ah, the expected variable is actually called event_params (instead of params). Sorry for the misleading text in BeaconLiveAdmin - I didn’t notice that before; we’ll have it fixed for the next release.