Upgrade from Rails 3.2 to Rails 4
ruby-on-rails, ruby-on-rails-3, ruby-on-rails-3.2, ruby-on-rails-4
Solution
I uploaded your gemfile to Ready for Rails 4, and it appears that you only have a couple gems that are not ready and one gem that is unknown. For some of the gems listed that do not have notes, I would suggest checking out their GitHub page (if they have one), and see if the gem has been updated recently on rubygems, just to confirm whether or not the gem works.
Problem
I have an application in Rails 3.2 which is ready to deploy. I am wondering should I upgrade it to Rails 4 or not. I also not sure about which of the gems might give issues with while upgrading. Below is my Gemfile with several common gems. Gemfile.rb ``` source 'https://rubygems.org' gem 'rails', '3.2.8' gem 'pg', '0.12.2' gem 'bcrypt-ruby', '3.0.1' gem 'will_paginate', '3.0.3' gem 'bootstrap-will_paginate', '0.0.6' gem 'simple_form', '2.0' gem 'rails3-jquery-autocomplete', '1.0.10' gem 'show_for', '0.1' gem 'paperclip', '3.3.1' gem 'cocoon', '1.1.1' gem 'google_visualr', '2.1.0' gem 'axlsx', '1.3.4' gem 'acts_as_xlsx', '1.0.6' gem 'devise' ,'2.1.2' gem 'cancan', '1.6.8' gem 'bootstrap-datepicker-rails', "0.6.32" gem 'country_select', '1.1.3' gem 'jquery-rails', '2.1.4' gem 'annotate', '2.5.0', group: :development gem 'ransack', '0.7.2' gem "audited-activerecord", "3.0.0" gem 'prawn', '1.0.0.rc2' gem 'exception_notification', '3.0.1' gem 'daemons', '1.1.9' gem 'delayed_job_active_record', '0.4.3' gem "delayed_job_web", '1.1.2' gem "less-rails" gem "therubyracer" gem 'twitter-bootstrap-rails', '~>2.1.9' gem "spreadsheet", "~> 0.8.8" # Gems used only for assets and not required # in production environments by default. group :assets do gem 'sass-rails', '3.2.5' gem 'coffee-rails', '3.2.2' # See https://github.com/sstephenson/execjs#readme for more supported runtimes # gem 'therubyracer', :platforms => :ruby gem 'uglifier', '1.2.3' end # To use ActiveModel has_secure_password # gem 'bcrypt-ruby', '~> 3.0.0' # To use Jbuilder templates for JSON # gem 'jbuilder' # Use unicorn as the app server # gem 'unicorn' # Deploy with Capistrano # gem 'capistrano' # To use debugger # gem 'debugger' group :development, :test do gem 'rspec-rails', '2.11.0' end group :test do gem 'capybara', '1.1.2' gem 'factory_girl_rails', '4.1.0' gem 'faker', '1.0.1' end ``` I started working on this application last year (Nov 2012) after reading this great book at http://ruby.railstutorial.org/. I have also checked out what's new in Rails 4 like strong parameters and it's all very tempting to try an upgrade. But I am concerned about compatibility of these gems and effort it may take. I need some advice from experienced guys in the community or someone who has tried upgrading before I move ahead.