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# Use with Ubuntu 22.04 jammy

# Prepare system

sudo apt update
sudo apt upgrade -y


# install docker

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Consultas de datos de varios modelos en Rails

Tipos de joins

En estos ejemplos la Tabla A tiene un has_many y la Tabla B un belongs_to y no tienen en cuenta que en la Tabla B podría haber varias referencias al mismo registro de la Tabla A, lo que produce duplicados de los registros de la Tabla A al hacer los joins.

Alias

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$ bundle config build.pg --with-opt-dir="/usr/local/opt/libpq"
$ gem install mysql2 -- --with-mysql-dir=/opt/homebrew/opt/mysql-client

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class ApplicationController < ActionController::Base
  private
  
  attr_reader :execution
  
  def execute(action, params={})
    @execution = action.new(params.reverse_merge(default_execute_params).call
  end
  
  def default_execute_params

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class ActionBase
  def self.call(*params)
    new(*params).call
  end
  
  def self.on(event, *methods)
    methods.each { |m| __on_listeners[event.to_sym] << m.to_sym }
  end

  def self.__on_listeners

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Docker Swarm

Install

$ sudo apt-get update
$ sudo apt-get install ca-certificates curl gnupg lsb-release
$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
$ echo \
 "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu \

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{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket"
            ],
            "Resource": [
                "arn:aws:s3:::bucket-name"

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#!/usr/bin/env bash

docker run \
  -d \
  --name "redis" \
  --restart unless-stopped \
  -p 6379:6379 \
  --mount 'type=volume,source=redis_storage,target=/data,volume-driver=local' \
  redis

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VPS + Dokku

• Run this recipes under unprivileged user but with sudo capability, i.e. ubuntu.

common

apt packages

$ sudo apt update

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Arduino Meteo

Programar el ESP8266 con Arduino

1. Abrimos Arduino > Preferences
2. Añadimos "http://arduino.esp8266.com/stable/package_esp8266com_index.json" al cuadro de texto

Referencias

• https://www.luisllamas.es/esp8266-nodemcu/