rake中止-是nil:NilClass的目录/未定义方法‘`downcase’

Question

我有一个rake任务，通过dragonfly-gem将pdf从我的文件系统导入到GridFS中。任务失败了，没有明显的原因。我很感谢你的帮助。谢谢!

rake任务：

task :worksafety_files => :environment do
# Importiert Archiv-Dateien via Dragonfly in GridFS  
Worksafety.all.each do |worksafety|
  if worksafety.doc_1_tmp != nil and File.exist?("#{Rails.root}/config/mongify/archiv/safety/#{worksafety.doc_1_tmp}")
    worksafety.doc_1 = File.new("#{Rails.root}/config/mongify/archiv/safety/#{worksafety.doc_1_tmp}")
    worksafety.doc_1_tmp = nil
  end
  if worksafety.doc_2_tmp != nil and File.exist?("#{Rails.root}/config/mongify/archiv/safety/#{worksafety.doc_2_tmp}")
    worksafety.doc_2 = File.new("#{Rails.root}/config/mongify/archiv/safety/#{worksafety.doc_2_tmp}")
    worksafety.doc_2_tmp = nil
  end
  if worksafety.doc_3_tmp != nil and File.exist?("#{Rails.root}/config/mongify/archiv/safety/#{worksafety.doc_3_tmp}")
    worksafety.doc_3 = File.new("#{Rails.root}/config/mongify/archiv/safety/#{worksafety.doc_3_tmp}")
    worksafety.doc_3_tmp = nil
  end
  if File.exist?("#{Rails.root}/config/mongify/archiv/safety/#{worksafety.doc_4_tmp}")
    worksafety.doc_4 = File.new("#{Rails.root}/config/mongify/archiv/safety/#{worksafety.doc_4_tmp}")
    worksafety.doc_4_tmp = nil
  end
  if File.exist?("#{Rails.root}/config/mongify/archiv/safety/#{worksafety.doc_5_tmp}")
    worksafety.doc_5 = File.new("#{Rails.root}/config/mongify/archiv/safety/#{worksafety.doc_5_tmp}")
    worksafety.doc_5_tmp = nil
  end       

  worksafety.save
end
end

堆栈跟踪：

rake aborted!
Is a directory - read
/home/vagrant/.rvm/gems/ruby-2.0.0-p0/bundler/gems/dragonfly-08de999d19a0/lib/dragonfly/temp_object.rb:198:in `copy_to_tempfile'
/home/vagrant/.rvm/gems/ruby-2.0.0-p0/bundler/gems/dragonfly-08de999d19a0/lib/dragonfly/temp_object.rb:100:in `tempfile'
/home/vagrant/.rvm/gems/ruby-2.0.0-p0/bundler/gems/dragonfly-08de999d19a0/lib/dragonfly/temp_object.rb:107:in `file'
....

我仔细检查了“安全”文件夹。里面只有pdf文件(用文件-i *检查mime--i)。我认为这个问题与dragonfly有关，因为当imagemagick在dragonfly配置中被激活时。

app.configure_with(:imagemagick)

堆栈跟踪是不同的：

rake aborted!
undefined method `downcase' for nil:NilClass
/home/vagrant/.rvm/gems/ruby-2.0.0-p0/bundler/gems/dragonfly-       08de999d19a0/lib/dragonfly/image_magick/utils.rb:26:in `identify'
/home/vagrant/.rvm/gems/ruby-2.0.0-p0/bundler/gems/dragonfly-08de999d19a0/lib/dragonfly/image_magick/analyser.rb:44:in `format'
/home/vagrant/.rvm/gems/ruby-2.0.0-p0/bundler/gems/dragonfly-08de999d19a0/lib/dragonfly/function_manager.rb:39:in `call'
/home/vagrant/.rvm/gems/ruby-2.0.0-p0/bundler/gems/dragonfly-08de999d19a0/lib/dragonfly/function_manager.rb:39:in `block (2 levels) in call_last'
/home/vagrant/.rvm/gems/ruby-2.0.0-p0/bundler/gems/dragonfly-08de999d19a0/lib/dragonfly/function_manager.rb:38:in `catch'
/home/vagrant/.rvm/gems/ruby-2.0.0-p0/bundler/gems/dragonfly-08de999d19a0/lib/dragonfly/function_manager.rb:38:in `block in call_last'
/home/vagrant/.rvm/gems/ruby-2.0.0-p0/bundler/gems/dragonfly-08de999d19a0/lib/dragonfly/function_manager.rb:37:in `each'
.....

Answer 1

损坏的正则表达式看起来像是check here

因为你的哪段this代码

也就是说，format, width, height, depth全部设置为nil，因为scan由于regex损坏而返回nil

我的建议是从你的角度修复regex，直到他们修复并修补它

希望这对你有所帮助

Answer 2

在使用rake任务根据excel文档中的列导入图像时，我遇到了此错误。我花了几分钟才意识到，如果文件名字段为空，这将是导致的错误。

我希望这对某些人有帮助:)