How to: use callbacks
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How to: Use Callbacks
Callbacks allow you to hook in your own code when a particular CarrierWave event occurs. The following callbacks are available for use in CarrierWave uploaders:
class MyUploader < CarrierWave::Uploader::Base #.... after :cache, :unlink_original def unlink_original(file) return unless delete_original_file File.delete if version_name.blank? end end
Using callbacks for a specific version of uploaded files
When you have multiple versions of files(images) to be processed and just want the callback to be triggered for a particular version then you can simply use the callback within the versions.
class MyUploader < CarrierWave::Uploader::Base #.... version :thumb50 do process :resize_to_fit => [50, 50] end version :thumb100 do process :resize_to_fit => [100, 100] after :store, :callback_method end def callback_method file puts self.version_name end end