asibbald

asibbald

Programming Phoenix LiveView B3.0 P237: More explanation needed

The text here could do with more explanation. It assumes a considerable amount of knowledge outside that covered so far in the book. If a reader doesn’t have this additional knowledge, they will not be able to understand what is being said here - which is pretty key to what we’re about to do.

an example of what I’m referring to:

“…The configuration sets the default adapter, PubSub.PG2. This adapter runs on Distributed Erlang––clients across distributed nodes of our app can subscribe to a shared topic and broadcast to that shared topic, because PubSub can directly exchange notifications between servers when configured to use the Phoenix.PubSub.PG2 adapter…”

First Post!

SophieDeBenedetto

SophieDeBenedetto

Author of Programming Phoenix LiveView

Hey @asibbald! Which part of this explanation felt unclear to you? The intended take-away here is: By using the PG2 adapter, your code will work even if you deploy your application in a distributed manner". This is what we mean by:

clients across distributed nodes of our app can subscribe to a shared topic and broadcast to that shared topic, because PubSub can directly exchange notifications between servers when configured to use the Phoenix.PubSub.PG2 adapter

It’s not important to understand the mechanics of the PG2 adapter or Distributed Erlang beyond that, and I don’t feel that a lack of that deeper understanding will prevent the reader from building out the feature in this section.

Where Next?

Popular Pragmatic Bookshelf topics Top

johnp
Hi Brian, Looks like the api for tinydb has changed a little. Noticed while working on chapter 7 that the .purge() call to the db throws...
New
simonpeter
When I try the command to create a pair of migration files I get an error. user=> (create-migration "guestbook") Execution error (Ill...
New
herminiotorres
Hi @Margaret , On page VII the book tells us the example and snippets will be all using Elixir version 1.11 But on page 3 almost the en...
New
patoncrispy
I’m new to Rust and am using this book to learn more as well as to feed my interest in game dev. I’ve just finished the flappy dragon exa...
New
brunogirin
When I run the coverage example to report on missing lines, I get: pytest --cov=cards --report=term-missing ch7 ERROR: usage: pytest [op...
New
taguniversalmachine
Hi, I am getting an error I cannot figure out on my test. I have what I think is the exact code from the book, other than I changed “us...
New
jonmac
The allprojects block listed on page 245 produces the following error when syncing gradle: “org.gradle.api.GradleScriptException: A prob...
New
Henrai
Hi, I’m working on the Chapter 8 of the book. After I add add the point_offset, I’m still able to see acne: In the image above, I re...
New
tkhobbes
After some hassle, I was able to finally run bin/setup, now I have started the rails server but I get this error message right when I vis...
New
davetron5000
Hello faithful readers! If you have tried to follow along in the book, you are asked to start up the dev environment via dx/build and ar...
New

Other popular topics Top

Exadra37
Please tell us what is your preferred monitor setup for programming(not gaming) and why you have chosen it. Does your monitor have eye p...
New
AstonJ
SpaceVim seems to be gaining in features and popularity and I just wondered how it compares with SpaceMacs in 2020 - anyone have any thou...
New
AstonJ
In case anyone else is wondering why Ruby 3 doesn’t show when you do asdf list-all ruby :man_facepalming: do this first: asdf plugin-upd...
New
PragmaticBookshelf
Build highly interactive applications without ever leaving Elixir, the way the experts do. Let LiveView take care of performance, scalabi...
New
mafinar
Crystal recently reached version 1. I had been following it for awhile but never got to really learn it. Most languages I picked up out o...
New
PragmaticBookshelf
Author Spotlight James Stanier @jstanier James Stanier, author of Effective Remote Work , discusses how to rethink the office as we e...
New
First poster: joeb
The File System Access API with Origin Private File System. WebKit supports new API that makes it possible for web apps to create, open,...
New
New
AnfaengerAlex
Hello, I’m a beginner in Android development and I’m facing an issue with my project setup. In my build.gradle.kts file, I have the foll...
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

Sub Categories: