TwistingTwists

Best Practices from LiveBeats App

This is a thread to note down things/best practices encountered in LiveBeats App as I explore the source code.

fly-apps/live_beats/blob/master/lib/live_beats_web/controllers/user_auth.ex#L29

      
        
            def on_mount(:ensure_authenticated, _params, session, socket) do
              case session do
                %{"user_id" => user_id} ->
                  new_socket = LiveView.assign_new(socket, :current_user, fn -> Accounts.get_user!(user_id) end)
                  %Accounts.User{} = new_socket.assigns.current_user
                  {:cont, new_socket}
            
            
    %{} ->
                  {:halt, redirect_require_login(socket)}
              end
            rescue
              Ecto.NoResultsError -> {:halt, redirect_require_login(socket)}
            end
            
            
defp redirect_require_login(socket) do
              socket
              |> LiveView.put_flash(:error, "Please sign in")
              |> LiveView.redirect(to: Routes.sign_in_path(socket, :index))
            end
            
            
@doc """

Found this usage of rescue/1

I’ve been meaning to handle Ecto errors myself. So this comes in handy for next time.

20 comments

/phoenix #presence #liveview

98 4034 20

2022-02-15 12:10:04 UTC

Most Liked

dorgan

Protip: if you press Y while seeing a github file it replaces the url at the address bar with a permalink so you can copy that instead of scrolling and clicking copy permalink

Post #7

RudManusachi

First of all, thank you for this initiative!

https://github.com/fly-apps/live_beats/blob/master/lib/live_beats_web/live/live_helpers.ex#L494

Never seen a for loop like this before.

I’d recommend to post a “permalink” to the line in the commit. That file was changed 7 hours ago. And looks like the link doesn’t point to the place you meant to.

Post #6

mcrumm

Phoenix Core Team

Check out the Phoenix.HTML docs for Link.link/2– You can override the default (:get) link method. You can also provide a data-confirm attribute to prompt the user before following the link. This is all ancient UX stuff that you get when you include phoenix_html.js.

Almost certainly, but take a look at router.ex to be sure. You don’t want to put destructive actions behind a GET method (especially a public one) otherwise any request to the path will trigger the destructive action. Imagine a search engine spidering your delete links– it’s not ideal.

Post #16

TwistingTwists

OneLiner For loop

https://github.com/fly-apps/live_beats/blob/master/lib/live_beats_web/live/live_helpers.ex#L494

Never seen a for loop like this before.

Practical render_slots

https://github.com/fly-apps/live_beats/blob/master/lib/live_beats_web/live/profile_live.ex#L22

Message passing other component from present one - JS.push

https://github.com/fly-apps/live_beats/blob/master/lib/live_beats_web/live/profile_live.ex#L25
“switch_profile” is in player_live.ex
https://github.com/fly-apps/live_beats/blob/master/lib/live_beats_web/live/player_live.ex#L208

Pattern Matching - via two variables in function - elegant

matching if current user is same as profile user or any other case.

https://github.com/fly-apps/live_beats/blob/master/lib/live_beats/accounts.ex#L93

Post #4

TwistingTwists

Who is current user in liveview app ? (even during redirects) More than just :fetch_current_user plug

https://github.com/fly-apps/live_beats/blob/master/lib/live_beats_web/controllers/redirect_controller.ex#L9

This has conn.assigns.current_user - without worrying that current_user might not exist.

above is possible because of plug :fetch_current_user here → https://github.com/fly-apps/live_beats/blob/master/lib/live_beats_web/controllers/redirect_controller.ex#L6

Post #3

Where Next?

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phoenix

presence

liveview

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Best Practices from LiveBeats App

TwistingTwists

Best Practices from LiveBeats App

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dorgan

RudManusachi

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TwistingTwists

TwistingTwists

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Best Practices from LiveBeats App

TwistingTwists

Best Practices from LiveBeats App

Most Liked

dorgan

RudManusachi

mcrumm

TwistingTwists

TwistingTwists

Where Next?

Popular in Guides/Tuts

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