allthemodels.rb

Rails.application.eager_load!

ApplicationRecord.subclasses.sort_by(&:name).each do |klass|
  puts "#{klass.table_name}"
  puts "==="
  puts

  puts "| Column | Type |"
  puts "|--------|------|"
  klass.columns.each do |column|
    puts "| #{column.name} | #{column.type} |"
  end
  puts
end