Ruby on rails 未定义的方法`内容长度'；对于零：零级雾存储[carrierwave]

我有两个模型在carrierwave的rails项目中使用相同的上传程序

class Brand < ActiveRecord::Base
    mount :avatar, AvatarUploader
end

class Profile < ActiveRecord::Base
    mount :avatar, AvatarUploader
end

它失败，出现以下堆栈跟踪

undefined method `content_length' for nil:NilClass
usr/lib64/ruby/gems/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/storage/fog.rb:238:in `size'
/usr/lib64/ruby/gems/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/uploader/proxy.rb:57:in `size'
/usr/lib64/ruby/gems/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/sanitized_file.rb:95:in `size'
/usr/lib64/ruby/gems/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/sanitized_file.rb:135:in `empty?'
/usr/lib64/ruby/gems/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/uploader/cache.rb:119:in `cache!'
/usr/lib64/ruby/gems/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/mount.rb:327:in `cache'
/usr/lib64/ruby/gems/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/mount.rb:179:in `avatar='
/usr/lib64/ruby/gems/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/orm/activerecord.rb:38:in `avatar='
/usr/share/nginx/cranberrychic/releases/20140213171925/app/services/brand_into_user_converter.rb:42:in `copy_avatar'
/usr/share/nginx/cranberrychic/releases/20140213171925/app/services/brand_into_user_converter.rb:13:in `convert'
(irb):64:in `block (2 levels) in irb_binding'
/usr/lib64/ruby/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction'
/usr/lib64/ruby/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/transactions.rb:208:in `transaction'
/usr/lib64/ruby/gems/1.9.1/gems/newrelic_rpm-3.6.0.78/lib/new_relic/agent/method_tracer.rb:486:in `block in transaction_with_trace_ActiveRecord_self_name_transaction'
/usr/lib64/ruby/gems/1.9.1/gems/newrelic_rpm-3.6.0.78/lib/new_relic/agent/method_tracer.rb:235:in `trace_execution_scoped'
/usr/lib64/ruby/gems/1.9.1/gems/newrelic_rpm-3.6.0.78/lib/new_relic/agent/method_tracer.rb:481:in `transaction_with_trace_ActiveRecord_self_name_transaction'
(irb):62:in `block in irb_binding'
/usr/lib64/ruby/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/relation/delegation.rb:6:in `each'
/usr/lib64/ruby/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/relation/delegation.rb:6:in `each'
(irb):59:in `irb_binding'
/usr/lib64/ruby/1.9.1/irb/workspace.rb:80:in `eval'
/usr/lib64/ruby/1.9.1/irb/workspace.rb:80:in `evaluate'
/usr/lib64/ruby/1.9.1/irb/context.rb:254:in `evaluate'
/usr/lib64/ruby/1.9.1/irb.rb:159:in `block (2 levels) in eval_input'
/usr/lib64/ruby/1.9.1/irb.rb:273:in `signal_status'
/usr/lib64/ruby/1.9.1/irb.rb:156:in `block in eval_input'
/usr/lib64/ruby/1.9.1/irb/ruby-lex.rb:243:in `block (2 levels) in each_top_level_statement'
/usr/lib64/ruby/1.9.1/irb/ruby-lex.rb:229:in `loop'
/usr/lib64/ruby/1.9.1/irb/ruby-lex.rb:229:in `block in each_top_level_statement'
/usr/lib64/ruby/1.9.1/irb/ruby-lex.rb:228:in `catch'
/usr/lib64/ruby/1.9.1/irb/ruby-lex.rb:228:in `each_top_level_statement'
/usr/lib64/ruby/1.9.1/irb.rb:155:in `eval_input'
/usr/lib64/ruby/1.9.1/irb.rb:70:in `block in start'
/usr/lib64/ruby/1.9.1/irb.rb:69:in `catch'
/usr/lib64/ruby/1.9.1/irb.rb:69:in `start'
/usr/lib64/ruby/gems/1.9.1/gems/railties-3.2.13/lib/rails/commands/console.rb:47:in `start'
/usr/lib64/ruby/gems/1.9.1/gems/railties-3.2.13/lib/rails/commands/console.rb:8:in `start'
/usr/lib64/ruby/gems/1.9.1/gems/railties-3.2.13/lib/rails/commands.rb:41:in `<top (required)>'
script/rails:6:in `require'
script/rails:6:in `<main>'

nil:NilClass的未定义方法“content\u length” usr/lib64/ruby/gems/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/storage/fog.rb:238:in'size' /usr/lib64/ruby/gems/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/uploader/proxy.rb:57:in'size' /usr/lib64/ruby/gems/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/sanitized_file.rb:95:in'size' /usr/lib64/ruby/gems/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/sanitized_file.rb:135:在'empty'中 /usr/lib64/ruby/gems/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/uploader/cache.rb:119:in'cache！' /usr/lib64/ruby/gems/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/mount.rb:327:in'cache' /usr/lib64/ruby/gems/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/mount.rb:179:in'avatar='10〕 /usr/lib64/ruby/gems/1.9.1/gems/carrierwave-0.9.0/lib/carrierwave/orm/activerecord.rb:38:in'avatar='10〕 /usr/share/nginx/cranberrychic/releases/20140213171925/app/services/brand\u-into\u-user\u-converter.rb:42:in'copy\u-avatar' /usr/share/nginx/cranberrychic/releases/20140213171925/app/services/brand\u-into\u-user\u-converter.rb:13:in'convert' （irb）：64:在“irb_绑定中的块（2级）”中 /usr/lib64/ruby/gems/1.9.1/gems/activerecord-3.2.13/lib/active\u record/connection\u adapters/abstract/database\u语句。rb:192:在“事务”中 /usr/lib64/ruby/gems/1.9.1/gems/activerecord-3.2.13/lib/active_record/transactions.rb:208:in'transaction' /usr/lib64/ruby/gems/1.9.1/gems/newrelic\u rpm-3.6.0.78/lib/newrelic/agent/method\u tracer.rb:486:在“事务块中使用跟踪、活动记录、自身名称、事务” /usr/lib64/ruby/gems/1.9.1/gems/newrelic_rpm-3.6.0.78/lib/newrelic/agent/method_tracer.rb:235:在“跟踪执行”范围内 /usr/lib64/ruby/gems/1.9.1/gems/newrelic\u rpm-3.6.0.78/lib/newrelic/agent/method\u tracer.rb:481:in“带有跟踪的事务”\u ActiveRecord\u self\u name\u transaction” （irb）：62:在“irb_绑定中的块” /usr/lib64/ruby/gems/1.9.1/gems/activerecord-3.2.13/lib/active_-record/relation/delegation.rb:6:in'each' /usr/lib64/ruby/gems/1.9.1/gems/activerecord-3.2.13/lib/active_-record/relation/delegation.rb:6:in'each' （irb）：59:in'irb_binding' /usr/lib64/ruby/1.9.1/irb/workspace.rb:80:in'eval' /usr/lib64/ruby/1.9.1/irb/workspace.rb:80:in'evaluate' /usr/lib64/ruby/1.9.1/irb/context.rb:254:in“evaluate”中 /usr/lib64/ruby/1.9.1/irb.rb:159:in`eval_输入中的块（2级）' /usr/lib64/ruby/1.9.1/irb.rb:273:处于“信号状态” /usr/lib64/ruby/1.9.1/irb.rb:156:in“评估输入中的块” /usr/lib64/ruby/1.9.1/irb/ruby-lex.rb:243:in`block（2个levels）中的每个顶级\u语句' /usr/lib64/ruby/1.9.1/irb/ruby-lex.rb:229:in'loop' /usr/lib64/ruby/1.9.1/irb/ruby lex.rb:229:in`block in each_top_level_语句' /usr/lib64/ruby/1.9.1/irb/ruby-lex.rb:228:in'catch' /usr/lib64/ruby/1.9.1/irb/ruby-lex.rb:228:“每个顶级语句” /usr/lib64/ruby/1.9.1/irb.rb:155:in'eval_input' /usr/lib64/ruby/1.9.1/irb.rb:70:in'block in start' /usr/lib64/ruby/1.9.1/irb.rb:69:in'catch' /usr/lib64/ruby/1.9.1/irb.rb:69:in'start' /usr/lib64/ruby/gems/1.9.1/gems/railties-3.2.13/lib/rails/commands/console.rb:47:in'start' /usr/lib64/ruby/gems/1.9.1/gems/railties-3.2.13/lib/rails/commands/console.rb:8:in'start' /usr/lib64/ruby/gems/1.9.1/gems/railties-3.2.13/lib/rails/commands.rb:41:in`' 脚本/rails:6:in'require' 脚本/rails:6:in`' 对我来说，carrierwave和fog存储是一个bug，因为在文件存储的开发过程中，一切都按预期工作。当我尝试使用carrierwave以任何可能的方式将图像从一个模型复制到另一个模型时，它会失败，并出现相同的错误

我的carrierwave版本是0.9.0

---

rails版本是3.2.13和ruby 1.9.3-p327，我相信你做得不对

profile.avatar = brand.avatar

将不起作用，因为

profile.avatar=

需要一个文件对象和

品牌。avatar

不给你文件对象（它会返回一个上传者，即avatar对象）

我相信你正在寻找这种方法

profile.remote_avatar_url = brand.avatar.url
profile.save!

考虑到

brand.avatar.url

给你一个carrierwave可以下载文件的url

有关

remote{uploader}\uURL

的更多信息也可以在Carrierwave中找到

希望这有帮助

profile.remote_avatar_url = brand.avatar.url
profile.save!