Carrierwave條件版本拋出參數錯誤

Question

我按照官方的github倉庫例子，但是當我定義的版本方法的情況下，我總是得到：

ArgumentError - wrong number of arguments (1 for 0): 
(gem) carrierwave-0.8.0/lib/carrierwave/uploader/versions.rb:198:in `block in active_versions' 
(gem) carrierwave-0.8.0/lib/carrierwave/uploader/versions.rb:192:in `active_versions' 

這裏我的代碼：

class PhotoUploader < CarrierWave::Uploader::Base 

    include CarrierWave::MiniMagick 
    storage :file 

    version :thumb_75, :if => :is_user? do 
     process :resize_to_fill => [75, 75] 
    end 

    version :thumb_87, :if => :is_question? do 
     process :resize_to_fill => [87, 87] 
    end 

    protected 
    def is_user? 
     model.class.to_s == 'Photo' 
    end 

    protected 
    def is_question? 
     model.class.to_s == 'Question' 
    end 

end 

如果我刪除它的工作條件... 任何想法可能是什麼？ 感謝

Answer 1

你必須做is_user?和is_question?方法接受一個參數：

protected 
def is_user?(picture) 
    model.class.to_s == 'Photo' 
end 

protected 
def is_question?(picture) 
    model.class.to_s == 'Question' 
end