ruby-on-rails - 如何为某些回形针样式添加条件？

Question

我有一个名为 Graphic 的模型，每个图形都属于一个名为 Book 的模型，该图形模型有 1 种样式，我想添加第二个名为“dealer_logo”的样式:

:thumb       => ['75x75>],
:dealer_logo => ['200x45>', :jpg], :if => Proc.new {|file| Book.find(self.book_id).origin_id == 33}

我只希望生成 dealer_logo 样式，但是如果 Book.origin_id 等于 33，则我无法使上述代码工作。

谁能给我一些指点？

谢谢

Answer 1

您需要使用自定义处理器: https://github.com/thoughtbot/paperclip/blob/master/lib/paperclip/processor.rb

By defining a subclass of Paperclip::Processor, you can perform any processing you want on the files that are attached. Any file in your Rails app’s lib/paperclip_processors directory is automatically loaded by paperclip, allowing you to easily define custom processors. You can specify a processor with the :processors option to has_attached_file:

has_attached_file :scan, :styles => { :text => { :quality => :better } },
                       :processors => [:ocr]