strong_methods

# Rake task to help migrating a rails 3 app to rails 4 strong_parameters.
# The task generates source code for helper methods for each model class
# to 'permit' the attributes.
# the generated methods are intended as starting point to copy&paste in the controller
# and than edit the permitted attributs.
# Some common names of non-editable attributes are already filtered,
# like 'id', 'password' or 'created_at'.
# The output is written to stdout so you can pipe it into a file
#
# Dependencies:
#   gem rails-erd is used to access the models and attributes.
#   
#
# Installation:
#   copy source file to ./lib/tasks
#   add this line to Gemfile in the development group:
#     gem 'rails-erd'
#
# Usage:
#   rake controller:strong_methods > tmp/strong_parameter_methods.rb
#
require "rails_erd/domain"

namespace :controller do
  desc "generate strong parameter helper methods from model attributes"
  task :strong_methods => [:environment, "erd:load_models" ] do

      domain = RailsERD::Domain.generate # Discover all models that are currently loaded...

      puts "# Strong parameters template methods. Copy&paste into your controllers and adjust."
      puts
      domain.entities.each do |entity|
        puts "# #{entity.name} strong parameter helper method"
        if entity.model
          param_key = ActiveModel::Naming.param_key(entity.model)
          puts "def #{param_key}_params"
          puts "  params.require(:#{param_key})."
          param_list = entity.attributes.reject do |attribute|
            attribute.to_s =~ /id|type|created_at|updated_at|_token$|_count$/
          end.map do | attribute|
             ':' + attribute.to_s
          end
          puts "    permit(#{param_list.join(', ')})"
          unless entity.model.nested_attributes_options.empty?
            puts "# @TODO: check nested attributes for #{entity.model.nested_attributes_options.keys.join(', ')} "
          end
          puts "end"
          puts
        end
      end
  end
end