peterc

• You MUST NOT try and generate a Rails app from scratch on your own by generating each file. For a NEW app you MUST use rails new first to generate all of the boilerplate files necessary.
• Create an app in the current directory with rails new .
• Use Tailwind CSS for styling. Use --css tailwind as an option on the rails new call to do this automatically.
• Use Ruby 3.2+ and Rails 8.0+ practices.
• Use the default Minitest approach for testing, do not use RSpec.
• Default to using SQLite in development. rails new will do this automatically but take care if you write any custom SQL that it is SQLite compatible.
• An app can be built with a devcontainer such as rails new myapp --devcontainer but only do this if requested directly.
• Rails apps have a lot of directories to consider, such as app, config, db, etc.
• Adhere to MVC conventions: singular model names (e.g., Product) map to plural tables (products); controllers are plural.
• Guard against incapable browsers accessing controllers with `allo

bradgessler

# config/initializers/phlex_template_handler.rb
require "action_view"
require "phlex"

# Intercept unknown "capitalized" method calls (e.g., PageView(...)) in templates,
# look up a Phlex component class, instantiate it, and render it.
# Crucially, we re-bind the user’s block so that `self` is the component, not the ActionView context.
module PhlexDynamicMethodCalls
  def method_missing(name, *args, **kwargs, &block)
    # Only intercept method calls starting with an uppercase letter (e.g. "PageView", "MyComponent", etc.)

peterc

How to set up a basic Sinatra + React webapp in 2025

Let's say you want to use Ruby for the backend of a basic webapp but React on the frontend. Here's how.

(Note: All tested on January 13, 2025 with Ruby 3.3, Sinatra 4.1.1, and React 18.3. Configs may change over time.)

First, create the app folder and set up Sinatra:

mkdir my-sinatra-react-app

pioz

Implementing Advisory Locks in SQLite3

In my Rails model, I initially had a function to handle advisory locks in PostgreSQL. Here's the code, which works as expected:

# Postgresql version
def with_advisory_lock
  self.class.connection.execute("SELECT pg_advisory_lock(#{self.id})")
  yield

floehopper

#!/usr/bin/env ruby

require "bundler/inline"

gemfile do
  source "https://rubygems.org"
  gem "typhoeus"
end

require "uri"

kyrylo

# frozen_string_literal: true
# config/initializers/colorized_logger.rb

# This initializer adds color to the Rails logger output. It's a nice way to
# visually distinguish log levels.
module ColorizedLogger
  COLOR_CODES = {
    debug:   "\e[36m",  # Cyan
    info:    "\e[32m",  # Green
    warn:    "\e[33m",  # Yellow

mackuba

#!/usr/bin/env ruby

# make sure you have Ruby installed, should be installed by default on macOS & Linux
# install Minisky lib with: [sudo] gem install minisky
# then run with: ruby follow_hashtag.rb somehashtag

require 'minisky'

if !File.exist?('config.yml')
  puts "Create a config.yml file with contents like this:"

tompng

require 'prism'
require 'ripper'
chars = %w[1 % = a b == * . ( ) , % ? ** & [ ] { } | ; : => ~ ! ^ || && '' .. ... < > + $a @a] + [' ', "\n", ' if ', ' and ',' rescue ', ' in ']
p seed: seed = rand(10000)
srand seed
$VERBOSE=nil
(3..10).each do |n|
  [chars.size**n, 100000].min.times do |i|
    code = n.times.map{chars.sample}.join
    p [n, i] if i % 1000 == 0

dannguyen

Extracting financial disclosure reports and police blotter narratives using OpenAI's Structured Output

tl;dr this demo shows how to call OpenAI's gpt-4o-mini model, provide it with URL of a screenshot of a document, and extract data that follows a schema you define. The results are pretty solid even with little effort in defining the data — and no effort doing data prep. OpenAI's API could be a cost-efficient tool for large scale data gathering projects involving public documents.

OpenAI announced Structured Outputs for its API, a feature that allows users to specify the fields and schema of extracted data, and guarantees that the JSON output will follow that specification.

For example, given a Congressional financial disclosure report, with assets defined in a table like this:

ioquatix

Permanent Connection Checkout

Rails 7.2 defaults:

Highscore.connection
# => #<ActiveRecord::ConnectionAdapters::SQLite3Adapter:0x000000000080e8 env_name="development" role=:writing>

With config.active_record.permanent_connection_checkout = :disallowed: