boiserunner
My app lets people connect their Garmin, Apple Watch, etc, to track activities, join virtual races, and create adventure activity plans. I have a leaderboard which is backed by a LiveView, in turn subscribed to a pub sub channel.
I’m using |> stream to add leaderboard data into my LiveView. When a new activity comes in from the provider, I broadcast a message with the new aggregate data for that runner.
And like magic, my leaderboard LiveView updates. There’s just one problem. Sorting!
If a runner overtakes another, the leaderboard is out of order. One simple fix is just to recompute the whole thing. But that feels inefficient — I can’t rely on stream_insert anymore.
Yet sorting at the template level also seems like it violates the design intention of streams.
Any thoughts on the “right” way to resolve this? Thank you!
Where Next?
Trending in Questions
Other Trending Topics
Latest Phoenix Threads
Latest on Elixir Forum
Sponsor Spotlight
Practical resources that improve the lives of professional developers.
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #library
- #deployment
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #elixirconf
- #channels
- #exunit
- #discussion
- #code-sync
- #podcasts
- #javascript
- #onsite
- #dialyzer
- #docker
- #authentication
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ecto-query
- #elixirconf-us
- #blog-post
- #ai
- #elixir-ls
- #phoenix_html
- #iex
- #graphql
- #genstage
- #websockets
- #supervisor
- #advent-of-code
- #distillery
- #processes
- #api
- #forms
- #hex
- #security
- #metaprogramming
Our Sponsors
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Catch errors, track performance, monitor hosts and more.
Error tracking, logs, uptime, and Just Enough APM. Built for developers.
Elixir, Erlang & BEAM conferences from Code Sync - join us in 2026!
Practical resources that improve the lives of professional developers.
Producing high quality Elixir screencasts since 2017.
**Building the future of software with AI, trust, and human connection.**
The team behind Membrane, Popcorn, LiveDebugger. Available for hire.
Courses that'll move you from confusion to "Aha, now I get it!"
Showing Posts 1 to 2- Show Best Posts
- Show All (oldest first)
- Show All (newest first)
garrison
The
stream_insert/4function accepts an :at argument to specify where to insert an item. I’m not sure if it works for updates though, and the docs seem to suggest it does not although it’s a bit vague.However, you should be able to call
stream_delete/3and thenstream_insert/4in that case to forcibly relocate the item in the DOM.frankdugan3
A quick thought is to continue using streams to add/update new data, but use a JS hook client-side to resort after update. You could do this if you added
data-sort-value={@your_sorting_value}to the leader board items, and after the resort, trim excess elements.The advantage of this is that you don’t need to track which position it belongs in server-side.