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spring-custom-commands

🚀 Supercharge Rails Commands with Spring Custom Commands​

Leverage Spring’s preloader to create custom commands that run against a warm application context. This drastically reduces startup overhead for repetitive tasks in development.

  1. Register your custom Spring command in config/spring.rb:
# config/spring.rb
require 'spring/command'
Spring.register_command(:stats) do |env, *args|
  # Preloaded Rails environment is available
  Rails.application.eager_load!
  puts "Model counts:"
  ApplicationRecord.descendants.each do |model|
    puts "  #{model.name}: #{model.count}"
  end
end
  1. Create a shim in bin/rails-stats to invoke Spring:
#!/usr/bin/env spring
<%# bin/rails-stats %>
require 'spring/commands'
Spring::Command::Stats.new(ARGV).call
  1. Make it executable and run:
chmod +x bin/rails-stats
bin/rails-stats

You now have a sub-second custom task that introspects your live app without cold boots.