89 lines
2.4 KiB
Ruby
89 lines
2.4 KiB
Ruby
module CarrierWave
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module Uploader
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module Processing
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extend ActiveSupport::Concern
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include CarrierWave::Uploader::Callbacks
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included do
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class_attribute :processors, :instance_writer => false
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self.processors = []
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before :cache, :process!
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end
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module ClassMethods
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##
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# Adds a processor callback which applies operations as a file is uploaded.
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# The argument may be the name of any method of the uploader, expressed as a symbol,
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# or a list of such methods, or a hash where the key is a method and the value is
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# an array of arguments to call the method with
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#
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# === Parameters
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#
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# args (*Symbol, Hash{Symbol => Array[]})
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#
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# === Examples
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#
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# class MyUploader < CarrierWave::Uploader::Base
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#
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# process :sepiatone, :vignette
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# process :scale => [200, 200]
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# process :scale => [200, 200], :if => :image?
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# process :sepiatone, :if => :image?
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#
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# def sepiatone
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# ...
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# end
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#
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# def vignette
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# ...
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# end
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#
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# def scale(height, width)
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# ...
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# end
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#
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# def image?
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# ...
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# end
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#
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# end
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#
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def process(*args)
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new_processors = args.inject({}) do |hash, arg|
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arg = { arg => [] } unless arg.is_a?(Hash)
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hash.merge!(arg)
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end
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condition = new_processors.delete(:if)
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new_processors.each do |processor, processor_args|
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self.processors += [[processor, processor_args, condition]]
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end
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end
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end # ClassMethods
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##
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# Apply all process callbacks added through CarrierWave.process
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#
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def process!(new_file=nil)
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return unless enable_processing
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self.class.processors.each do |method, args, condition|
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if(condition)
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if condition.respond_to?(:call)
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next unless condition.call(self, :args => args, :method => method, :file => new_file)
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else
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next unless self.send(condition, new_file)
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end
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end
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self.send(method, *args)
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end
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end
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end # Processing
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end # Uploader
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end # CarrierWave
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