michael

michael

Detecting Postgresql Table Change for LiveView

So I have a table of MediaItems and when that list changes, say new entries, I’d like LiveView to know about that so that the Timeline updates automatically. How to know when the table updates? I’ve seen supabase but that appears to be for JS.

Most Liked

Exadra37

Exadra37

You use Phoenix PubSub to broadcast them each time you create, update or delete them.

Then in the handle_info on your live view you can use send_update/2 to update the client.

Some useful links:

dimitarvp

dimitarvp

You are looking for Change Data Capture which goes well beyond the scope of PostgreSQL. If you can achieve CDC with your DB then you should be able to pretty easily propagate events to any other frontend/backend system, LiveView included.

michael

michael

Hi thanks for the reply because I never heard of CDC before(probably because when it comes to backend development I’m just a novice). I do think though that CDC goes way beyond the scope of what I’m looking for. I’m just trying to learn LiveView and everything I’ve found about is so far in terms of examples is user-initiated actions changing state rather than server events. I think if I followed this CDC path I would get bogged-down in the details of CDC rather than develop the frontend.

Where Next?

Popular Frontend topics Top

DevotionGeo
Dart is not the first language with that mistake, but it’s newer. It shouldn’t have repeated this mistake.
New
New
AstonJ
I was watching this video by Richard Feldman (Elm core team) and he’s predicting TypeScript is going to take over the JS world: ...
New
AstonJ
DHH might like you to believe they are a thing of the past: https://twitter.com/dhh/status/1275902566719610880 I actually went down thi...
New
MikhailPertsev
Finally, I am going to enhance my css skills! I have always somehow ignored this, but now I finally decided to understand animations, tr...
New
First poster: bot
23.44% of the PRs made by outsiders (not owners/members) get merged. PRs usually closed after 0.17 days (median) ** Based on most recen...
New
Ayushk
Hello, This is pretty basic. I was trying to explore the front-end development as I was not from a tech background. But, very much inter...
New
XSukhpreet
My Favorite tool is figma, It helps a lot in designing .
New
harwind
Why does the image in my <img> tag appear larger than its specified width within a flex container? Here’s my HTML and CSS code: HT...
New
vinay003
When it comes to integrating messaging features into super apps, you’ll want a reliable and efficient solution. Here are some top SMS API...
New

Other popular topics Top

wolf4earth
@AstonJ prompted me to open this topic after I mentioned in the lockdown thread how I started to do a lot more for my fitness. https://f...
New
Exadra37
I am thinking in building or buy a desktop computer for programing, both professionally and on my free time, and my choice of OS is Linux...
New
foxtrottwist
A few weeks ago I started using Warp a terminal written in rust. Though in it’s current state of development there are a few caveats (tab...
New
mafinar
This is going to be a long an frequently posted thread. While talking to a friend of mine who has taken data structure and algorithm cou...
New
PragmaticBookshelf
Rails 7 completely redefines what it means to produce fantastic user experiences and provides a way to achieve all the benefits of single...
New
PragmaticBookshelf
Author Spotlight Jamis Buck @jamis This month, we have the pleasure of spotlighting author Jamis Buck, who has written Mazes for Prog...
New
husaindevelop
Inside our android webview app, we are trying to paste the copied content from another app eg (notes) using navigator.clipboard.readtext ...
New
PragmaticBookshelf
Author Spotlight: VM Brasseur @vmbrasseur We have a treat for you today! We turn the spotlight onto Open Source as we sit down with V...
New
AstonJ
If you’re getting errors like this: psql: error: connection to server on socket “/tmp/.s.PGSQL.5432” failed: No such file or directory ...
New
AstonJ
Curious what kind of results others are getting, I think actually prefer the 7B model to the 32B model, not only is it faster but the qua...
New