Clarification assign_new in phoenix component

[blset]

the problem raises out of this post

Liveview 0.18.3 bug on component?

In your AssignUser.on_mount, during the disconnected rendering that happens first, the assign_new uses the :current_user set in the Plug pipeline by UserAuth.fetch_current_user (see doc). This uses Accounts.get_user_by_session_token that doesn’t have the preload you want so it crashes. If you navigate to this page while being already connected on the websocket, it can’t reuse the :current_user so it has to fetch it via Accounts.get_user_by_session_token_with_parameter that has the good preload …

I had an assign_new that I thought did not shared current_user from conn but is does.

So I was wondering how to make this happen, how to make another variable be retrieved from conn by assign_new. Or if this is only “hardcoded” for current_user.

of course you can pass variables through session in mount, but then why an exception for current_user ?

that’s what I do not understand