This is a very odd resemblance, but the feel of adding a form to Liveview resembles the simplicity of good old Delphi. You get a single place where you can define the layout and the actions (achieving high coherence) without the concerns getting in each others way.
Month: November 2020
Getting started with Elixir Phoenix using Docker
I am working through the Grox.io course on Phoenix Liveview.
Having come back to this after a while I had forgotten the database setup.
Here is what I have reconstructed, using Docker:
docker run -d -e POSTGRES_PASSWORD=postgres -p 5432:5432 postgres:11
mix ecto.create
mix phx.server
This enabled me to get started again.
Processes in Iex
The Elixir iex shell is a very powerful tool in itself.
I have recently found a trick that makes it much easier to use. If you get stuck in a line that you just can’t complete just type :break + return and it will cancel that line.
This is an investigation of what you get out of the box.
Lets start with the processes that exist in an empty iex session:
iex > Process.list |> Enum.count
56
Process.registered |> Enum.count
33
That means that there are 33 named processes started with iex and 23 anonymous ones.
Here are the named ones:
Elixir.IEx.Broker - GenServer, communicates with other components.
Elixir.IEx.Config - Agent, handles .iex.config file
Elixir.IEx.Pry - GenServer, Handles Pry debugging
Elixir.IEx.Supervisor - Supervisor for the above three Services.
Elixir.Logger, Service for logging, works with logger.
Elixir.Logger.BackendSupervisor, Supervises the backend for the logger
Elixir.Logger.Supervisor - Supervisor for the logger components
application_controller - GenServer, handles loaded applications
code_server - Erlang code server
elixir_code_server - GenServer that manages loaded code in ets
elixir_config - GenServer that stores config in ets
elixir_sup - Supervisor for the above two GenServers
erl_prim_loader
erl_signal_server
erts_code_purger
file_server_2
global_group
global_name_server
inet_db
init
kernel_refc
kernel_safe_sup
kernel_sup
logger - Erlang logger service, used by Elixir.Logger
logger_handler_watcher
logger_proxy
logger_sup
rex
socket_registry
standard_error
standard_error_sup
user
user_drv
We have the following applications loaded:
iex > :application_controller.loaded_applications
[
{:logger, 'logger', '1.10.4'},
{:iex, 'iex', '1.10.4'},
{:compiler, 'ERTS CXC 138 10', '7.6.2'},
{:elixir, 'elixir', '1.10.4'},
{:stdlib, 'ERTS CXC 138 10', '3.13'},
{:kernel, 'ERTS CXC 138 10', '7.0'}
]
You can find out more using :observer.start
These cover 43 of the Processes
I have 13 to track down.
Nodes 2020 Extended
I was the first speaker at Nodes 2020 Extended.
This is the first time I have done an event that was live streamed. It was a bit odd having two different streams being shared at the same time (video + audio on one) and the screen on the other.
Thanks to @ElLazal and @nsmith_piano for hosting.
I almost got caught out by the demo gods: I had installed Neo4j 4 at the conference a couple of weeks ago and found that my utility will need some updates before it will work with that version. Thankfully I was able to quickly debug this using a docker image. It’s possible to create a Neo4j 3.5 db in Neoj4j which saved the day.
Developer Rants 