uninitialized constant CarrierWave

问题

I am deploying my first rails app using passenger and capistrano.

every thing is fine until i faced this error when I tried to launch the app in the browser.

Error message:
   uninitialized constant CarrierWave

Exception class:
   NameError

you can see the message in details at http://test.ajhezaty.com/

the site works perfectly locally and CarrierWave uploading the image correctly.

I tried to restart the VPS server by running

sudo /etc/init.d/httpd2 restart

but it didnt fix the issue.

for your information the gem installed on the server

 $ gem list | grep carrierwave
 carrierwave (0.6.1)

回答1:

You need to add carrierwave to your application.rb file like this:

require File.expand_path('../boot', __FILE__)

require 'rails/all'

require 'carrierwave'

if defined?(Bundler)
  # Bundler stuff
end

# Rest of file ommited.

This worked for me in production using nginx/unicorn. Don't forget to restart your unicorn server.

回答2:

You may have the gem installed locally, but make sure you add it to your Gemfile, bundle install through ssh, and require it in the controllers that will use it.

来源：https://stackoverflow.com/questions/10116953/uninitialized-constant-carrierwave