CarrierWave RMagick - How do I cause manipulate! to be called?

问题

Greetings wise people,

I am trying to use MiniMagick with CarrierWave in Rails 3 to resize and store an image according to the instructions here: http://carrierwave.rubyforge.org/rdoc/classes/CarrierWave/MiniMagick.html

I can upload images with no processing. The image is uploaded and I can see it in the directory and the application. But when I try to perform processing on the image, the block inside manipulate! method is never being called. Do you know how I can solve this?

I have the following uploader that works:

class MyContentImageUploader < CarrierWave::Uploader::Base
  include CarrierWave::MiniMagick
end

With this code, I am able to upload images using my form and view them on the result page. Everything is peachy.

I added a simple resize to the uploader like this:

class MyContentImageUploader < CarrierWave::Uploader::Base
  include CarrierWave::MiniMagick
  process resize_to_fit: [200,200]
end

After adding the process call, the image does not upload, but I also never see an error. I tried to add a custom method to the uploader and saw the same result:

class MyContentImageUploader < CarrierWave::Uploader::Base
  include CarrierWave::MiniMagick
  def do_stuff:
    manipulate! do |img|
      img = img.resize_to_fit(200,200)
    end
  end
end

Nothing happens. The image doesn't update on the server, but I never see an error. I placed some raise calls into the do_stuff method to see how far the call was executing. It turns out the do_stuff method is being called, but the block inside manipulate! is not. How could this be happening? How would you troubleshoot this problem?

Additional info: I have inside config/initializers/carrierwave.rb the following code, so I believe processing is enabled:

CarrierWave.configure do |config|
    config.storage = :file
    config.enable_processing = true
end

I am using:

Rails 3.2.12
CarrierWave 0.8.0
MiniMagick 3.5.0

来源：https://stackoverflow.com/questions/15503652/carrierwave-rmagick-how-do-i-cause-manipulate-to-be-called

标签

ruby-on-rails-3

carrierwave

image-resizing

minimagick