Automatically reload gems in rails 5 on every request in development

gistfile1.rb

# Source: http://timcardenas.com/automatically-reload-gems-in-rails-327-on-eve

# Inside config/environments/development.rb
 
 
# Do the following after every request to the server in development mode
ActionDispatch::Callbacks.to_cleanup do
 
  # If the gem's top level module is currently loaded, unload it
  if Object.const_defined?(:MyCoolGem)
    Object.send(:remove_const, :MyCoolGem)
  end
 
  # Instruct ruby to "unrequire" all of the gems files.
  # CAREFUL: make sure this only matches your gems files.
  $".delete_if {|s| s.include? "my_cool_gem"}
 
  # Re-require your gem 
  # Note: because we removed all files previously required they will be reloaded
  # even if you didn't use load/autoload in your gem.
  require "my_cool_gem"
 
end