add_stong_params.rb

# Run from the directory containing the app
# Given the app name
# Iterates over the models and replaces attr_accessible with strong params in the assocated controller
require 'active_support/inflector'
app_name = ARGV.first

models = Dir.entries("#{app_name}/app/models/").reject {|name| ['.', '..', '.gitkeep', 'permission.rb', 'user.rb'].include? name }.map {|name| name.split('.').first}

models.each do |model_name|
  model_file_name = "#{app_name}/app/models/#{model_name}.rb"
  controller_file_name = "#{app_name}/app/controllers/#{model_name.pluralize}_controller.rb"
  model_contents = File.read(model_file_name)

  puts "updating model #{model_file_name}"

  params = model_contents.split("\n").grep(/attr_accessible/)
    .map {|line| line.gsub(/attr_accessible/, '')}

  new_model_contents = model_contents.gsub(/attr_accessible/, '# attr_accessible')
  File.open(model_file_name, "w") {|file| file.puts new_model_contents }

  controller_contents = File.read(controller_file_name)

  if controller_contents.include? "params[:#{model_name}]"
    params_method_name = "#{model_name}_params"
    new_controller_contents = controller_contents.gsub("params[:#{model_name}]", params_method_name)
    new_controller_contents = new_controller_contents.split("\n")

    popped = ''
    while popped.strip != "end"
      popped = new_controller_contents.pop
    end

    puts "adding params"
    new_controller_contents << "\n"
    new_controller_contents << "  def #{model_name}_params"
    new_controller_contents << "    params.require(:#{model_name}).permit("
    params.each_with_index do |param_line, index|
      last = (index + 1 == params.length)
      if last
        new_controller_contents << "  " + param_line + ")"
      else
        new_controller_contents << "  " + param_line + ","
      end
    end
    new_controller_contents << "  end "
    new_controller_contents << "end "

    puts "opening file"
    File.open(controller_file_name, "w") {|file| file.puts new_controller_contents.join("\n") }
  end
end