kirpachov

Rails notifications with websockets and ActionCable

Backend

1. Create file connection.rb, notification_channel.rb, channel.rb
2. Install redis

Frontend (angular)

1. Install deps with

• npm i --save actioncable
• npm i --save-dev @types/actioncable

kirpachov

See Medium forum 'include-vs-prepend-vs-extend' See Ruby simple command example

Test with irb

module BasicObject::SecondGigi; def banana1; 'banana1'; end end
module BasicObject::FirstGigi;  def banana2; 'banana2'; end end
class BasicObject; include FirstGigi; prepend SecondGigi; end
class Gigi; end

kirpachov

Svg to ico with ubuntu bash

1. Install

NOTE: Some of this may be unecessary, idk sudo apt install inkscape imagemagick libcanberra-gtk-module libcanberra-gtk3-module canberra-gtk-module

2. Insert into ~/.bashrc

# This function will generate a '.ico' from a '.svg' and it will mov to the requested path

kirpachov

Tunneling http with caddy

You can expose a http port from a private network using caddy and ssh

Getting started

1. Set up the server
2. Set up the client
3. Navigate to your host.

Server

Server must be a pc or a server with a static public ip and a nameserver.

kirpachov

function get_html(){
   echo $(cat $filename | sed 's/<!--.*-->//g' | sed 's/\/*.*\*\///g' | sed 's/\/\/.*$//gm')
}

kirpachov

/**
* Emit each element of array as single event.
*/
const array$: Subject<string[]> = new Subject<string[]>();

const each$: Observable<string> = array$.pipe(
  tap((v: string[]) => console.log('array', v)),
  switchMap((array: string[]) => merge(...(array.map((item: string) => of(item))))),
  tap((v: string) => console.log('each', v)),
);

kirpachov

Try this in your rails console with rails c:

Sidekiq.redis{|r| r.get("stat:processed") }

some_data = Sidekiq.redis { |conn|
    conn.pipelined do
    conn.get("stat:processed")
    conn.get("stat:failed")
 conn.zcard("schedule")

kirpachov

# -*- mode: ruby -*-
# vi: set ft=ruby :

# All Vagrant configuration is done below. The "2" in Vagrant.configure
# configures the configuration version (we support older styles for
# backwards compatibility). Please don't change it unless you know what
# you're doing.
Vagrant.configure("2") do |config|
  # The most common configuration options are documented and commented below.
  # For a complete reference, please see the online documentation at

kirpachov

Active storage

• Does not save files to disk until commit.

Post.transaction do
  # This one is ok. Returns true.
  @post.attachments.attach(io: StringIO.new("something...."), filename: "new-post.txt", content_type: "plain/text")
  
  # This would raise ActiveStorage::FileNotFound error.
  # Plus, you won't find any new file in the filesystem until commit.
 # @post.attachments.last.download

kirpachov

# Add Docker's official GPG key: 1
sudo apt-get update
sudo apt-get install ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

# Add the repository to Apt sources:
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \