ruby script to add dependent: :destroy to all models if you forgot to do so in the first place :)

dependent_destroy_script.rb

#path to folder with model files
dir = "./app/models/*.rb"

Dir.glob dir do |file|
  pattern = /(has_one|has_many).*$/
  text_to_append = ", dependent: :destroy\n"
  before = File.read file
  new_text = ''
  
  before.each_line do |line|
    if match = line.match(pattern)
      line = line.chomp + text_to_append
    end
    new_text += line
  end
  
  File.open(file, 'w') { |f| f << new_text }
end