Ruby on Rails

Hi all,

I've been trying to find out if Rails 4.2 provides a single command that regenerates config/application.rb in an existing application. 

I'm trying to find something more lightweight than running 'rails new MyApp' in a new directory and copying over the file.

The reason I ask is imagine a Rails app is 'rails new'-ed without the --skip-test-unit option.

Then at a much later date, this app is switched to RSpec. Can config/application.rb be regenerated as if the --skip-test-unit option had been supplied originally to 'rails new ...'?

All this would effectively do is change the require statements near the top of config/application.rb file from:

require 'rails/all'

to:

# Pick the frameworks you want:
require "active_model/railtie"
require "active_job/railtie"
require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "action_view/railtie"
require "sprockets/railtie"
# require "rails/test_unit/railtie"

It's possible to get part of the way there with this command:

bin/rake rails:update:configs

Which asks if you want to overwrite config/application.rb and generates a new copy. However, I've not been successful in getting that command to make use of the --skip-test-unit option. I've tried variations on this without luck:

bin/rake rails:update:configs[--skip-test-unit]

Many thanks in advance for any help,

Eliot

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